U.S. flag

An official website of the United States government

Dot gov

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Https

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

PubAg

Main content area

You searched for: Publication Year 2018 Remove constraint Publication Year: 2018 Subject term cyclohexanones Remove constraint Subject term: cyclohexanones
Start Over

Search

60  Search Results

« Previous | 1 - 50 of 60 |
Number of results to display per page

Search Results

1. Acidity enhanced [Al]MCM-41 via ultrasonic irradiation for the Beckmann rearrangement of cyclohexanone oxime to ɛ-caprolactam

Author:
Zichun Wang; Huajuan Ling; Jeffrey Shi; Catherine Stampfl; Aibing Yu; Michael Hunger; Jun Huang
Source:
Journal of catalysis 2018 v.358 pp. 71-79
ISSN:
0021-9517
Subject:
Bronsted acids; acidity; aluminum; catalysts; catalytic activity; cyclohexanones; hydrogen bonding; irradiation; liquids; nuclear magnetic resonance spectroscopy; silicon; synthetic fibers; temperature; ultrasonics
Abstract:
... Using solid acid catalysts to replace liquid acids in the liquid-phase Beckmann rearrangement of cyclohexanone oxime (CHO) into ɛ-caprolactam (CPL) is crucial for the environmentally friendly production of synthetic fibers, such as Nylon-6. In this work, we prepared aluminum-containing MCM-41 catalysts under ultrasonic irradiation with various Si/Al ratios for this purpose. Quantitative ¹H MAS NMR ...
DOI:
10.1016/j.jcat.2017.11.013

2. Active site arginine controls the stereochemistry of hydride transfer in cyclohexanone monooxygenase

Author:
Osei Boakye Fordwour; Kirsten R. Wolthers
Source:
Archives of biochemistry and biophysics 2018 v.659 pp. 47-56
ISSN:
0003-9861
Subject:
flavin-containing monooxygenase; nuclear magnetic resonance spectroscopy; stereospecificity; lactones; arginine; isotopes; stereochemistry; NADP (coenzyme); cyclohexanones; active sites; hydrogen; hydrogen bonding; oxygen; hydrides
Abstract:
... Cyclohexanone monooxygenase (CHMO) uses NADPH and O2 to insert oxygen into an array of (a)cyclic ketones to form esters or lactones. Herein, the role of two conserved active site residues (R327 and D57) in controlling the binding mode of NADP(H) was investigated. Wild type CHMO elicits a kinetic isotope effect (KIE) of 4.7 ± 0.1 and 1.1 ± 0.1 with 4(R)-[4-²H]NADPH and 4(S)-[4-²H]NADPH, respectivel ...
DOI:
10.1016/j.abb.2018.09.025

3. Active site variants provide insight into the nature of conformational changes that accompany the cyclohexanone monooxygenase catalytic cycle

Author:
Osei Boakye Fordwour; Kirsten R. Wolthers
Source:
Archives of biochemistry and biophysics 2018 v.654 pp. 85-96
ISSN:
0003-9861
Subject:
nicotinamide; lactones; NADP (coenzyme); models; reducing agents; cyclohexanones; phosphates; active sites; hydrogen bonding; spectral analysis; Acinetobacter; catalytic activity; oxygen; ribose
Abstract:
... Baeyer-Villiger monooxygenases are flavoenzymes that use NADPH and O2 to convert ketones to esters or lactones. A diagnostic feature of BVMO catalysis is the dual role of the pyridine nucleotide: NADPH functions as a reductant of the FAD cofactor and the resulting NADP+ acts to stabilize the ensuing C4a-peroxyflavin intermediate. Using cyclohexanone monooxygenase from Acinetobacter sp. NCIMB 9871 ...
DOI:
10.1016/j.abb.2018.07.016

4. Alkenyl cyclohexanone derivatives from Lannea rivae and Lannea schweinfurthii

Author:
Souaibou Yaouba; Andreas Koch; Eric M. Guantai; Solomon Derese; Beatrice Irungu; Matthias Heydenreich; Abiy Yenesew
Source:
Phytochemistry letters 2018 v.23 pp. 141-148
ISSN:
1874-3900
Subject:
Escherichia coli; Lannea; Staphylococcus aureus; antibacterial properties; bark; beta-sitosterol; catechin; cell lines; cyclohexanones; cytotoxicity; epicatechin; inflammation; lupeol; mammals; mass spectrometry; nuclear magnetic resonance spectroscopy; phenols; prostatic neoplasms; roots
Abstract:
... Phytochemical investigation of the CH2Cl2/MeOH (1:1) extract of the roots of Lannea rivae (Chiov) Sacleux (Anacardiaceae) led to the isolation of a new alkenyl cyclohexenone derivative: (4R,6S)-4,6-dihydroxy-6-((Z)-nonadec-14′-en-1-yl)cyclohex-2-en-1-one (1), and a new alkenyl cyclohexanol derivative: (2S*,4R*,5S*)-2,4,5-trihydroxy-2-((Z)-nonadec-14′-en-1-yl)cyclohexanone (2) along with four known ...
DOI:
10.1016/j.phytol.2017.12.001

5. Application of a thermostable Baeyer–Villiger monooxygenase for the synthesis of branched polyester precursors

Author:
Marie AF Delgove; Matthew T Elford; Katrien V Bernaerts; Stefaan MA De Wildeman
Source:
Journal of chemical technology and biotechnology 2018 v.93 no.8 pp. 2131-2140
ISSN:
0268-2575
Subject:
Thermocrispum municipale; biocatalysis; biocatalysts; cyclohexanones; engineering; industrial applications; lactones; methanol; oxidation; polyesters; solubility; solvents; thermal stability; toluene
Abstract:
... BACKGROUND: It is widely accepted that the poor thermostability of Baeyer–Villiger monooxygenases limits their use as biocatalysts for applied biocatalysis in industrial applications. The goal of this study was to investigate the biocatalytic oxidation of 3,3,5‐trimethylcyclohexanone using a thermostable cyclohexanone monooxygenase from Thermocrispum municipale (TmCHMO) for the synthesis of branch ...
DOI:
10.1002/jctb.5623
PubMed:
30069077
PubMed Central:
PMC6055809

6. Cation-Exchange Resin Catalyzed Ketalization Reaction of Cyclohexanone with 1,4-Butanediol: Thermodynamics and Kinetics

Author:
Jia Qian; Minqian Qiu; Zuoxiang Zeng; Weilan Xue; Jumei Xu
Source:
Industrial & engineering chemistry process design and development 2018 v.57 no.14 pp. 4841-4847
ISSN:
1520-5045
Subject:
active sites; agitation; atmospheric pressure; catalysts; catalytic activity; cation exchange resins; cyclohexanones; kinetics; models; particle size; process design; temperature; thermodynamics
Abstract:
... The thermodynamics and kinetics for the ketalization reaction of cyclohexanone with 1,4-butanediol catalyzed by 732 cation-exchange resin were studied for the first time. The reaction equilibrium compositions were obtained from 293.15 to 333.15 K at atmospheric pressure, and the equilibrium constants was estimated using the UNIFAC model. The thermodynamic properties of the ketalization reaction we ...
DOI:
10.1021/acs.iecr.8b00354

7. Curcumin derivative, 2,6-bis(2-fluorobenzylidene)cyclohexanone (MS65) inhibits interleukin-6 production through suppression of NF-κB and MAPK pathways in histamine-induced human keratinocytes cell (HaCaT)

Author:
Nurul Atika Razali; Nur Amiza Nazarudin; Kok Song Lai; Faridah Abas; Syahida Ahmad
Source:
BMC complementary and alternative medicine 2018 v.18 no.1 pp. 217
ISSN:
1472-6882
Subject:
adverse effects; alternative medicine; anti-inflammatory activity; anti-inflammatory agents; antihistamines; bromides; curcumin; cyclohexanones; cytotoxicity; enzyme-linked immunosorbent assay; gene expression; histamine; humans; hypersensitivity; inhibitory concentration 50; interleukin-6; keratinocytes; lethal concentration 50; mitogen-activated protein kinase; quantitative polymerase chain reaction; reverse transcriptase polymerase chain reaction; skin diseases; transcription factor NF-kappa B
Abstract:
... BACKGROUND: Histamine is a well-known mediator involved in skin allergic responses through up-regulation of pro-inflammatory cytokines. Antihistamines remain the mainstay of allergy treatment, but they were found limited in efficacy and associated with several common side effects. Therefore, alternative therapeutic preferences are derived from natural products in an effort to provide safe yet reli ...
DOI:
10.1186/s12906-018-2223-8
PubMed:
30012134
PubMed Central:
PMC6048808

8. Designing a novel tetradentate polyoxometalate eco-catalyst for the synthesis of β-aminocyclohexanone derivatives in water

Author:
Roya Mozafari; Fariba Heidarizadeh; Maedeh Azaroon
Source:
RSC advances 2018 v.8 no.70 pp. 40261-40266
ISSN:
2046-2069
Subject:
Fourier transform infrared spectroscopy; acidity; ambient temperature; aniline; anions; benzaldehyde; bromides; catalysts; catalytic activity; cations; cyclohexanones; energy; imidazoles; imines; metals; nuclear magnetic resonance spectroscopy; oxidation; protons; raw materials; stereospecificity; thermogravimetry
Abstract:
... The synthesis of a series of known β-aminocyclohexanones has been accomplished using pentaerythrityl tetramethyl imidazolium phosphotungstate (C(MIM-PTA)₄) as a new tetradentate acidic catalyst. It was prepared via condensation of pentaerythrityl tetrabromide with methyl imidazole. Then, bulky anion H₂PW₁₂O₄₀¹⁻ was substituted with Br⁻ in the structure. This tetradentate catalyst provides designab ...
DOI:
10.1039/c8ra08259f

9. Determination of the Liquid/Liquid Mass Transfer Coefficient for Each Phase in Microchannels

Author:
Liantang Li; Jisong Zhang; Chencan Du; Guangsheng Luo
Source:
Industrial & engineering chemistry process design and development 2018 v.57 no.27 pp. 9028-9036
ISSN:
1520-5045
Subject:
cyclohexanones; droplets; hexane; liquids; mass transfer; models; process design; sulfuric acid
Abstract:
... The overall mass transfer coefficient of liquid/liquid microflows has been extensively studied, but the liquid/liquid mass transfer coefficient for each phase in the microchannels has never been reported the best of our knowledge. In this work, the overall mass transfer coefficient and mass transfer coefficient for each phase (inside and outside droplet) of liquid–liquid microflows were determined ...
DOI:
10.1021/acs.iecr.8b01976

10. Direct C–H Cyanoalkylation of Quinoxalin-2(1H)-ones via Radical C–C Bond Cleavage

Author:
Lin Yang; Pin Gao; Xin-Hua Duan; Yu-Rui Gu; Li−Na Guo
Source:
Organic letters 2018 v.20 no.4 pp. 1034-1037
ISSN:
1523-7052
Subject:
caffeine; chemical bonding; chemical reactions; chemical structure; cleavage (chemistry); cyclohexanones; esters; flavones
Abstract:
... An efficient synthesis of cyanoalkylated heteroarenes via iron-catalyzed direct C–H cyanoalkylation of heteroarenes has been developed. Structurally diverse cyanoalkyl motifs generated through C–C bond cleavage of cyclobutanone oxime esters have been introduced into quinoxalin-2(1H)-ones, flavone, benzothiazoles, and caffeine in good to excellent yields. Remarkably, less-strained cyclopentanone an ...
DOI:
10.1021/acs.orglett.7b03984

11. Dissolution of Asphaltene in Binary Mixtures of Organic Solvents and Model Maltenes: Unambiguous Evidence for Asphaltene Preferential Solvation and Relevance to Assessing the Efficiency of Additives for Asphaltene Stabilization

Author:
Luzia P. Novaki; Nicolas Keppeler; Michelle M. N. Kwon; Letícia T. Paulucci; Márcia C. K. de Oliveira; Francis A. Meireles; Wilhelm J. Baader; Omar A. El Seoud
Source:
Energy & fuels 2018 v.33 no.1 pp. 58-67
ISSN:
1520-5029
Subject:
absorbance; additives; adverse effects; asphaltenes; color; cyclohexanones; emulsions; heptane; liquids; models; oils; petroleum; solubility; solvents; toluene; viscosity
Abstract:
... Asphaltenes (Asps) are operationally defined as the toluene-soluble but n-pentane- or n-heptane-insoluble fractions, e.g., of crude oils. Therefore, there is intense interest in determining the concentration of n-heptane required to precipitate Asps from their solutions in particular media (solvents, solvent mixtures, and maltenes). Here, we report on the dependence of Asp dissolution in binary mi ...
DOI:
10.1021/acs.energyfuels.8b02892

12. Draft Genome Sequence of Cyclohexylamine-Degrading Strain Acinetobacter sp. YT-02 Isolated

Author:
Da-Zhong Yan; Ya-Ting Gan; Hui Zhou; Jun Liu; Xin Li
Source:
Current microbiology 2018 v.75 no.3 pp. 284-287
ISSN:
0343-8651
Subject:
Acinetobacter; Gram-negative bacteria; activated sludge; biochemical pathways; chromosomes; cyclohexanones; enzymes; genes; metabolites; nucleotide sequences; oxidation; pollutants; ribosomal RNA; sequence analysis
Abstract:
... Acinetobacter sp. YT-02, a Gram-negative bacterium isolated from the activated sludge from a sodium N-cyclohexylsulfamate production plant, has the ability to degrade cyclohexylamine. It was classified as a member of Acinetobacter sp., a Gram-negative bacterium, sharing a 16S rRNA gene sequence identity of 99% with Acinetobacter guangdongensis strain 1NM-4. It could degrade 10 mmol/L cyclohexylami ...
DOI:
10.1007/s00284-017-1377-9

13. Effect of mint oil against Botrytis cinerea on table grapes and its possible mechanism of action

Author:
Ren Xueuan; Song Dandan; Liang Zhuo; Kong Qingjun
Source:
European journal of plant pathology 2018 v.151 no.2 pp. 321-328
ISSN:
0929-1873
Subject:
Botrytis cinerea; Lavandula; alkenes; antifungal agents; antifungal properties; cell walls; chemical composition; conidia; cyclohexanones; direct contact; disease incidence; dose response; fungi; gas chromatography-mass spectrometry; germination; gray mold; hyphae; in vitro studies; mechanism of action; mint; nucleic acids; pathogens; proteins; sage oil; scanning electron microscopes; table grapes; tea tree oil; transmission electron microscopes; ultrastructure; vapors
Abstract:
... This paper assessed the antifungal effects of sage oil, lavender oil, mint oil, and tea tree oil on the postharvest fungal pathogen, Botrytis cinerea, which causes gray molds. The change of morphology, physiological, and biochemical characteristics about fungal hyphae and conidia were determined. As results show, all four oils can effectively inhibit the growth of B.cinerea and the antifungal effe ...
DOI:
10.1007/s10658-017-1375-6

14. Effect of solvents on the microstructure aggregation of a heavy crude oil

Author:
Mario Minale; Maria C. Merola; Claudia Carotenuto
Source:
Fuel processing technology 2018 v.177 pp. 299-308
ISSN:
0378-3820
Subject:
asphaltenes; cyclohexanones; diesel fuel; microstructure; petroleum; shrinkage; solubility; solvents; viscosity; xylene
Abstract:
... We study the asphaltene microstructure in a heavy crude oil in response to the addition of solvents of different qualities by measuring the intrinsic viscosity and the Huggins coefficient. Dilution with good solvents (xylene and cyclohexanone) causes the native asphaltene clusters swelling, while that with poor solvents (a diesel oil and a C11-C14 alkanes mixture) may induce different microstructu ...
DOI:
10.1016/j.fuproc.2018.05.016

15. Efficient and reusable SBA-15-immobilized Brønsted acidic ionic liquid for the ketalization of cyclohexanone with glycol

Author:
Ruiyun Li; Heyuan Song; Guoqin Wang; Jing Chen
Source:
RSC advances 2018 v.8 no.13 pp. 7179-7185
ISSN:
2046-2069
Subject:
Fourier transform infrared spectroscopy; catalysts; catalytic activity; cyclohexanones; differential scanning calorimetry; ionic liquids; nitrogen; reaction mechanisms; scanning electron microscopy; sulfates; temperature; thermogravimetry
Abstract:
... Ketalization of cyclohexanone with glycol has been carried out using molecular sieve SBA-15 immobilized Brønsted acidic ionic liquid catalyst. The properties of the heterogeneous catalysts were characterized by elemental analysis, Fourier transform infrared (FT-IR) spectra, scanning electron microscopy (SEM), thermogravimetry/differential scanning calorimetry (TG/DSC), and N₂ adsorption–desorption ...
DOI:
10.1039/c7ra13385e

16. Enantioselective organocatalytic approach to δ-lactones bearing a fused cyclohexanone scaffold

Author:
Dorota Kowalczyk; Łukasz Albrecht
Source:
Tetrahedron letters 2018 v.59 pp. 2636-2639
ISSN:
0040-4039
Subject:
Cinchona; catalysts; catalytic activity; chemical reactions; cyclohexanones; enantioselectivity; methodology; moieties; quinine
Abstract:
... A new method based on the cascade reaction between β,γ-unsaturated-α-ketophosphonates and cyclic 1,3-dicarbonyls is reported for the synthesis of highly enantiomerically enriched δ-lactones bearing a fused cyclohexenone scaffold. The target products bearing a δ-lactone moiety and one stereogenic center were obtained in good to excellent yields (83–96%) and enantioselectivities (63:32–95:5 er). The ...
DOI:
10.1016/j.tetlet.2018.05.053

17. Enhanced shape selective catalysis of mixed cyclic ketones in aerobic Baeyer-Villiger oxidation with magnetic Cu-Fe3O4 supported mesoporous silica microspheres

Author:
Chunming Zheng; Shubin Chang; Chuanwu Yang; Dongying Lian; Chao Ma; Chunrong Zhang; Xiangrui Fan; Shichao Xu; Xiaohong Sun
Source:
Tetrahedron 2018 v.74 no.21 pp. 2608-2616
ISSN:
0040-4020
Subject:
active sites; air; benzaldehyde; catalysts; catalytic activity; copper; cyclohexanones; hot water treatment; magnetism; magnetite; mass transfer; microparticles; oxidation; porous media; silica
Abstract:
... Various strategies have been developed to improve the conversion for the Baeyer-Villiger oxidation. However, the catalytic effects of the Baeyer-Villiger oxidation for the mixed ketones are rarely reported, though it is also important for the natural and industrial separation processes. In this report, magnetite Cu modified Fe3O4 supported mesoporous silica microspheres (Cu-Fe3O4@mSiO2) have been ...
DOI:
10.1016/j.tet.2018.04.009

18. Histidine-based copper tetrapeptides as enantioselective catalysts for aldol reactions

Author:
Begum Sharifa Zaithun; AbdulMalek Emilia; Tahir Mohamed Ibrahim Mohamed; Crouse Karen Anne; Abdul Rahman Mohd Basyaruddin
Source:
RSC advances 2018 v.8 no.59 pp. 34004-34011
ISSN:
2046-2069
Subject:
Fourier transform infrared spectroscopy; amino acids; catalysts; catalytic activity; chemical bonding; circular dichroism spectroscopy; copper; cycloaddition reactions; cyclohexanones; enantioselectivity; fluorescence; high performance liquid chromatography; mass spectrometry; molecular weight; optical isomerism; oxidation; peptides; polarimetry; ultraviolet-visible spectroscopy
Abstract:
... Copper(ii)-peptides are widely used as industrial catalysts such as in the aerobic oxidation of organic molecules, formation of new C–H bonds and in the azide–alkyne cycloaddition reaction. The length of peptides and the effect of adding copper metal into peptides were questioned in their field of applications. Five novel histidine-based tetrapeptides with the sequences HAAD (P1), HAFD (P2), HAVD ...
DOI:
10.1039/c8ra06814c

19. Identification of Vicinal Silanols and Promotion of Their Formation on MCM-41 via Ultrasonic Assisted One-Step Room-Temperature Synthesis for Beckmann Rearrangement

Author:
Zichun Wang; Yijiao Jiang; Yunyao Zhang; Jeffrey Shi; Catherine Stampfl; Michael Hunger; Jun Huang
Source:
Industrial & engineering chemistry process design and development 2018 v.57 no.16 pp. 5550-5557
ISSN:
1520-5045
Subject:
ambient temperature; catalysts; catalytic activity; cyclohexanones; energy; epsilon-caprolactam; nuclear magnetic resonance spectroscopy; porous media; process design; silicon; ultrasonic treatment; ultrasonics
Abstract:
... Siliceous mesoporous MCM-41 materials were synthesized under ultrasonic treatment from 0.5 to 3 h. The obtained U-[Si]MCM-41 catalysts were applied in the Beckmann rearrangement of cyclohexanone oxime (CHO) to ε-caprolactam (CPL). The ultrasonic treatment can increase the pore wall thickness, while the density of surface SiOH groups increased slightly. Quantitative ¹H MAS NMR studies of the U-[Si] ...
DOI:
10.1021/acs.iecr.8b00274

20. Iodine-catalyzed synthesis of N,N′-diaryl-o-phenylenediamines from cyclohexanones and anilines using DMSO and O₂ as oxidants

Author:
Mingteng Xiong; Zhan Gao; Xiao Liang; Pengfei Cai; Heping Zhu; Yuanjiang Pan
Source:
Chemical communications 2018 v.54 no.69 pp. 9679-9682
ISSN:
1364-548X
Subject:
aromatization; cyclohexanones; dimethyl sulfoxide; oxidants; oxygen
Abstract:
... A novel I₂-catalyzed cross-dehydrogenative aromatization of cyclohexanones and anilines to synthesize N,N′-diaryl-o-phenylenediamines has been unprecedentedly developed with dimethyl sulfoxide and oxygen employed as mild terminal oxidants. To prove the rationality of the two separate dehydration steps of the proposed mechanism, a resulting I₂-catalyzed cross-dehydrogenative aromatization of cycloh ...
DOI:
10.1039/c8cc05320k

21. Isolation and Identification of Six Difunctional Ethyl Esters from Bio-oil and Their Special Mass Spectral Fragmentation Pathways

Author:
Min Li; Dong Liu; Xing-Shun Cong; Qing-Tai Chen; Nan Shi; Jun-Hui Wu; Yuan-Xi Yang; Xue-Bin Zhang; Chong-Chong Wu
Source:
Energy & fuels 2018 v.32 no.10 pp. 10649-10655
ISSN:
1520-5029
Subject:
biofuels; cyclohexanones; dicarboxylic acids; esters; gas chromatography-mass spectrometry; hydrogen; ions; transesterification
Abstract:
... Three difunctional ethyl esters (DFEEs), including ethyl 16-hydroxyhexadecanoate, ethyl (Z)-18-hydroxyoctadec-9-enoate, and diethyl (Z)-octadec-9-ene-1,18-dioate, were isolated as nearly pure compounds from sawdust-derived bio-oil. Their structures were tentatively identified by gas chromatography/mass spectrometry (GC/MS) and high-resolution mass spectrometry (HR-MS). Combination transesterificat ...
DOI:
10.1021/acs.energyfuels.8b02059

22. Metal-Free Mesoporous SiO2 Nanorods as a Highly Efficient Catalyst for the Baeyer–Villiger Oxidation under Mild Conditions

Author:
Xueyao Zhang; Honglei Yang; Guangxue Yang; Shuwen Li; Xiang Wang; Jiantai Ma
Source:
ACS sustainable chemistry & engineering 2018 v.6 no.5 pp. 5868-5876
ISSN:
2168-0485
Subject:
adsorption; atmospheric pressure; catalysts; catalytic activity; cyclohexanones; electron paramagnetic resonance spectroscopy; filtration; free radicals; nanorods; oxidants; oxidation; porous media; silica; surface area; sustainable technology
Abstract:
... The development of efficient and environmentally friendly catalysts for oxidative reaction is of great importance in applied catalysis. In this work, a simple and environmentally benign approach for highly selective preparation of ε-caprolactone by oxidation of cyclohexanone has been carried out, which employed metal-free mesoporous silica (mSiO₂) nanorods as catalyst under atmospheric pressure. T ...
DOI:
10.1021/acssuschemeng.7b04167

23. Optimization-Based Design of a Reactive Distillation Column for the Purification Process of Cyclohexanone Using Rigorous Simulation Model and Validated Using an Experimental Packed Column

Author:
David Lorenzo; Aurora Santos; Carlos Perez-Galvan; Cristian Triana; Arturo Romero; Ian David Lockhart Bogle
Source:
Industrial & engineering chemistry process design and development 2018 v.57 no.48 pp. 16407-16422
ISSN:
1520-5045
Subject:
algorithms; caprolactam; catalysts; cyclohexanones; distillation; equations; industry; kinetics; process design; purification methods; raw materials; simulation models; sodium hydroxide
Abstract:
... This paper presents a model for a reactive distillation column where 2-cyclohexen-1-one is eliminated from a mixture of cyclohexanone and cyclohexanol. In the purification of cyclohexanone, 2-cyclohexen-1-one must be removed to produce high quality caprolactam. A common practice in industry is to promote the condensation of 2-cyclohexen-1-one with cyclohexanone using NaOH as catalyst. However, it ...
DOI:
10.1021/acs.iecr.8b03560

24. Oxidative coupling of cycloalkanones with 3-(pyridin-2-yl)-1,2,4-triazinone coordinated to Pd(II)

Author:
Mustafa M. El-Abadelah; Firas F. Awwadi; Hamdallah A. Hodali; Rasha S. Rawajfeh; Monther S. Zreid; Wolfgang Voelter
Source:
Zeitschrift für Naturforschung 2018 v.73 no.8 pp. 583-587
ISSN:
1865-7117
Subject:
X-ray diffraction; cyclohexanones; geometry; palladium; spectral analysis
Abstract:
... Dichloro[3-(pyridin-2-yl)-1,2,4-triazinone]Pd(II) undergoes oxidative C–C coupling reaction with cyclopentanone and cyclohexanone at 110°C to yield the respective Pd complexes, chloro[1-(4-chlorophenyl)-5-(2-hydroxycyclopent-1-enyl)-3-(pyridin-2-yl)-1,2,4-triazin-6(1H)-one]palladium(II) (3) and chloro[1-(4-chlorophenyl)-5-(2-hydroxycyclohex-1-enyl)-3-(pyridin-2-yl)-1,2,4-triazin-6(1H)-one]palladiu ...
DOI:
10.1515/znb-2018-0077

25. Room-Temperature Tandem Condensation-Hydrogenation Catalyzed by Porous C₃N₄ Nanosheet-Supported Pd Nanoparticles

Author:
Renfeng Nie; Minda Chen; Yuchen Pei; Biying Zhang; Long Qi; Jingwen Chen; Tian Wei Goh; Zhiyuan Qi; Zhiguo Zhang; Wenyu Huang
Source:
ACS sustainable chemistry & engineering 2018 v.7 no.3 pp. 3356-3363
ISSN:
2168-0485
Subject:
ambient temperature; carbon nitride; catalysts; catalytic activity; cyclohexanones; hydrogen; hydrogenation; nanoparticles; nanosheets; nitriles; palladium; surface area
Abstract:
... Tandem catalysis, often inspired by biological systems, offers many advantages in the synthesis of highly functionalized small molecules. NH₂-grafted porous C₃N₄ nanosheet with rich N species and surface area of 138 m²/g was fabricated via a NH₃-exfoliation method. After supporting Pd nanoparticles, the resulting bifunctional catalyst (Pd/C₃N₄–NH₂) could catalyze a one-step tandem condensation-hyd ...
DOI:
10.1021/acssuschemeng.8b05531

26. Selective hydrogenation of phenol to cyclohexanone by SiO2-supported rhodium nanoparticles under mild conditions

Author:
Hongwei Zhang; Aijuan Han; Kazu Okumura; Lixiang Zhong; Shuzhou Li; Stephan Jaenicke; Gaik-Khuan Chuah
Source:
Journal of catalysis 2018 v.364 pp. 354-365
ISSN:
0021-9517
Subject:
ambient temperature; catalysts; chemical bonding; cleavage (chemistry); cyclohexanones; dissociation; hydrogen; hydrogenation; nanoparticles; phenol; rhodium; terraces
Abstract:
... A silica-supported rhodium catalyst for the selective hydrogenation of phenol to cyclohexanone under mild conditions has been developed. As the Rh concentration on the catalyst increased from 0.5 to 15 wt%, the conversion (at phenol/Rh mole ratio 100/1) dropped whereas the initial selectivity to cyclohexanone increased. The direct hydrogenation to cyclohexanol occurred in parallel with partial hyd ...
DOI:
10.1016/j.jcat.2018.06.002

27. Specific detection of Lysobacter antibioticus strains in agricultural soil using PCR and real-time PCR

Author:
Fu Lina; Wang Ting; Wei Lanfang; Yang Jun; Liu Qi; Wang Yating; Wang Xing; Ji Guanghai
Source:
FEMS microbiology letters 2018 v.365 no.20 pp. -
ISSN:
1574-6968
Subject:
Burkholderia; DNA; Lysobacter antibioticus; Lysobacter capsici; Lysobacter enzymogenes; Microbacterium; Pseudomonas; agricultural soils; bacteria; biological control; cyclohexanones; detection limit; genes; metabolites; oligodeoxyribonucleotides; plant pathogens; quantitative polymerase chain reaction; screening; soil sampling
Abstract:
... Lysobacter antibioticus is an important biocontrol bacteria against phytopathogens in soil, and with the ability to produce nonvolatile antimicrobial metabolites has been extensively characterised. It is important to establish applicable techniques to detect and monitor L. antibioticus directly and accurately in soil samples. We developed and tested 13 primer sets according to phenazine gene (phzA ...
DOI:
10.1093/femsle/fny219

28. Spectroscopic insights leading to a better understanding of site-isolation in heterogeneous nanocatalysts

Author:
Maela Manzoli; Andrea Jouve; Arran M. Gill; Giancarlo Cravotto; Robert Raja
Source:
Journal of materials chemistry 2018 v.6 no.29 pp. 14410-14419
ISSN:
2050-7496
Subject:
Fourier transform infrared spectroscopy; active sites; anions; catalysts; catalytic activity; copper; copper nanoparticles; cyclohexanones; extrusion; monitoring; oils; oxidation; oxygen; particle size distribution; spectral analysis; transmission electron microscopy
Abstract:
... Pt nanoparticles (NPs) extruded from a copper chloropyrophosphate (CuClP) framework have been synthesized with different metal loadings and evaluated in the KA oil oxidation with molecular oxygen. Before reaction, the catalysts were subjected to an activation procedure in reducing atmosphere at 200 °C in order to extrude the Pt NPs. Having a optimal loading of active sites (Pt nanoparticles) leads ...
DOI:
10.1039/c8ta03656j

29. Structural Features and Pyrolysis Behaviors of Extracts from Microwave-Assisted Extraction of a Low-Rank Coal with Different Solvents

Author:
Yankun Xiong; Lijun Jin; Yang Li; Yang Zhou; Haoquan Hu
Source:
Energy & fuels 2018 v.33 no.1 pp. 106-114
ISSN:
1520-5029
Subject:
Fourier transform infrared spectroscopy; aromatic hydrocarbons; chemical structure; coal; cyclohexanones; mass spectrometry; microwave treatment; molecular weight; nuclear magnetic resonance spectroscopy; pyrolysis; solid phase extraction; solvents; tetrahydrofuran; thermogravimetry
Abstract:
... Microwave-assisted extraction (MAE) of a low-rank Naomaohu (NMH) coal was conducted with two solvents, cyclohexanone (CYC) and tetrahydrofuran (THF), to obtain extracts (ECYC and ETHF) and residues (RCYC and RTHF). The parent coal, extract, and residue were characterized by ultimate analysis, TG, FTIR, GPC, ¹H NMR, and solid-state ¹³C NMR. The results showed that MAE process is more efficient than ...
DOI:
10.1021/acs.energyfuels.8b03255

30. Synthesis of Cyclohexanones through a Catalytic Cationic Cyclization of Alkynols or Enynes

Author:
Pedro Alonso; Raquel Fontaneda; Pilar Pardo; Francisco J. Fañanás; Félix Rodríguez
Source:
Organic letters 2018 v.20 no.6 pp. 1659-1662
ISSN:
1523-7052
Subject:
alkynes; biomimetics; chemical reactions; chemical structure; cyclohexanones; solvents
Abstract:
... A novel procedure for the synthesis of cyclohexanones from alkynol or enyne derivatives through a cationic cyclization has been developed. The key points to obtain the six-membered ring derivatives are the use of starting materials containing a terminal alkyne, the use of tetrafluoroboric acid as a promoter of the cationic cyclization, and the appropriate selection of 1,1,1,3,3,3-hexafluoropropan- ...
DOI:
10.1021/acs.orglett.8b00437

31. Synthesis of hexahydro-4-phenylquinoline-3-carbonitriles using Fe₃O₄@SiO₂-SO₃H nanoparticles as a superior and retrievable heterogeneous catalyst under ultrasonic irradiations

Author:
Javad Safaei-Ghomi; Reza Aghagoli; Hossein Shahbazi-Alavi
Source:
Zeitschrift für Naturforschung 2018 v.73 no.5 pp. 269-274
ISSN:
1865-7117
Subject:
aldehydes; ammonium acetate; catalysts; condensation reactions; cyclohexanones; nanoparticles; renewable energy sources; ultrasonics
Abstract:
... An efficient synthesis of hexahydro-4-phenylquinoline-3-carbonitriles is described by the four-component condensation reaction of cyclohexanone, ammonium acetate, malononitrile, and aromatic aldehydes using Fe₃O₄@SiO₂-SO₃H nanoparticles as a superior and retrievable heterogeneous catalyst under ultrasonic irradiations. The reusability of the catalyst and little catalyst loading, excellent yields, ...
DOI:
10.1515/znb-2017-0200

32. Synthesis of o-Arylenediamines through Elemental Sulfur-Promoted Aerobic Dehydrogenative Aromatization of Cyclohexanones with Arylamines

Author:
Zhen Wang; Xiangui Chen; Hao Xie; Dahan Wang; Huawen Huang; Guo-Jun Deng
Source:
Organic letters 2018 v.20 no.17 pp. 5470-5473
ISSN:
1523-7052
Subject:
aromatization; chemical structure; cyclohexanones; dehydrogenation; protocols
Abstract:
... Herein, the first elemental sulfur-promoted aerobic dehydrogenative aromatization of cyclohexanones is described that provides novel access to synthetically useful o-arylenediamines. This protocol complements previous palladium- and iodine-catalyzed diarylamine formation from cyclohexanones and anilines. ...
DOI:
10.1021/acs.orglett.8b02387

33. Synthesis of α-Arylated Cycloalkanones from Congested Trisubstituted Spiro-epoxides: Application of the House–Meinwald Rearrangement for Ring Expansion

Author:
Nagalakshmi Jeedimalla; Camille Jacquet; Diana Bahneva; Jean-Jacques Youte Tendoung; Stéphane P. Roche
Source:
Journal of organic chemistry 2018 v.83 no.20 pp. 12357-12373
ISSN:
1520-6904
Subject:
aldehydes; aluminum chloride; aromatic hydrocarbons; bismuth; carbon; catalytic activity; chemical structure; chemoselectivity; cyclohexanones; epoxidation reactions; feedstocks; organic chemistry; palladium; regioselectivity; synthesis
Abstract:
... A three-step sequence for the synthesis of α-arylated cyclohexanones and the most challenging cycloheptanones is reported. First, an efficient one-pot synthesis of β,β’-disubstituted benzylidene cycloalkanes (styrenes) using the palladium-catalyzed Barluenga reaction from readily available feedstock chemicals is described. Furthermore, an epoxidation followed by the House–Meinwald rearrangement (H ...
DOI:
10.1021/acs.joc.8b01448

34. Total Synthesis of Norsampsones A and B, Garcinielliptones N and O, and Hyperscabrin A

Author:
Changwu Zheng; Xueying Wang; Wenwei Fu; Yue Lu; Hongsheng Tan; Hongxi Xu
Source:
Journal of natural products 2018 v.81 no.11 pp. 2582-2589
ISSN:
1520-6025
Subject:
alkylation; cyclohexanones; optical isomerism; oxazolidinones; stereoselectivity
Abstract:
... The asymmetric total synthesis of five decarbonyl polycyclic polyprenylated acylphloroglucinols norsampsnes A (3) and B (4), garcinielliptones O (5) and N (6), and hyperscabrin A (7) is described. The synthesis to construct the core substituted cyclohexanone ring of these natural products was achieved by a key Dieckmann condensation. The chirality of the molecules was introduced by the stereoselec ...
DOI:
10.1021/acs.jnatprod.8b00763

35. An investigation of presence of 2- and 3-monochloropropanediol fatty acid esters in Canadian human milk samples

Author:
Adam Becalski; Tony Zhao; Michael Granvogl; Tye Arbuckle
Source:
Food additives & contaminants 2018 v.35 no.10 pp. 1881-1889
ISSN:
1944-0057
Subject:
derivatization; women; catalysts; alpha-chlorohydrin; transesterification; Canadians; breast milk; cyclohexanones; fatty acid esters; isotope dilution technique; sulfonic acids; tandem mass spectrometry; acid hydrolysis; stable isotopes; liquid chromatography; gas chromatography-mass spectrometry
Abstract:
... Occurrence of 2- and 3-monochloropropanediol fatty acid esters (MCPDEs) in 199 human milk samples collected from Canadian women was examined in this study. MCPDEs were determined via indirect analytical approach by using acidic hydrolysis/transesterification and derivatization with cyclohexanone using a fluorinated sulfonic acid resin as a catalyst followed by GC-MS analysis. Analyses were done by ...
DOI:
10.1080/19440049.2018.1506163

36. A new microporous oxyfluorinated titanium(IV) phosphate as an efficient heterogeneous catalyst for the selective oxidation of cyclohexanone

Author:
Piyali Bhanja; Sauvik Chatterjee; Astam K. Patra; Asim Bhaumik
Source:
Journal of colloid and interface science 2018 v.511 pp. 92-100
ISSN:
0021-9797
Subject:
Fourier transform infrared spectroscopy; X-ray photoelectron spectroscopy; adipic acid; adsorption; catalysts; catalytic activity; cyclohexanones; desorption; differential thermal analysis; hydrogen peroxide; liquids; nanomaterials; nitrogen; nuclear magnetic resonance spectroscopy; oxidants; oxidation; phosphates; phosphorus; porous media; scanning electron microscopy; solvents; stable isotopes; thermogravimetry; titanium; value added
Abstract:
... Designing a new porous nanomaterial for eco-friendly catalytic reactions is very challenging. Here, a new crystalline microporous oxyfluorinated titanium phosphate material (TIPO-1) has been synthesized under hydrothermal conditions in the absence of any structure directing agent. The triclinic crystalline phase with the unit cell parameters a=7.962Å, b=10.006Å, c=13.979Å, α=96.921°, β=95.851° and ...
DOI:
10.1016/j.jcis.2017.09.115

37. 8-Hydroxy-2-methylquinoline-modified H₄SiW₁₂O₄₀: a reusable heterogeneous catalyst for acetal/ketal formation

Author:
Li-jun Liu; Qing-jie Luan; Jing Lu; Dong-mei Lv; Wen-zeng Duan; Xu Wang; Shu-wen Gong
Source:
RSC advances 2018 v.8 no.46 pp. 26180-26187
ISSN:
2046-2069
Subject:
Fourier transform infrared spectroscopy; X-ray diffraction; catalysts; catalytic activity; cyclohexanones; scanning electron microscopy; temperature; thermogravimetry; titration
Abstract:
... A heteropoly acid based organic hybrid heterogeneous catalyst, HMQ-STW, was prepared by combining 8-hydroxy-2-methylquinoline (HMQ) with Keggin-structured H₄SiW₁₂O₄₀ (STW). The catalyst was characterized via elemental analysis, X-ray diffractometry (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), thermogravimetric analysis (TG) and potentiometric titratio ...
DOI:
10.1039/c8ra04471f

38. Arginine-Assisted Hydrothermal Synthesis of Urchin-like Nb2O5 Nanostructures Composed of Nanowires and Their Application in Cyclohexanone Ammoximation

Author:
Yong Wang; Feng Xin; Xiaohong Yin; Yuexiao Song; Tianyu Xiang; Junzheng Wang
Source:
Journal of physical chemistry 2018 v.122 no.4 pp. 2155-2164
ISSN:
1932-7455
Subject:
Fourier transform infrared spectroscopy; X-ray diffraction; catalysts; catalytic activity; cyclohexanones; differential thermal analysis; hot water treatment; nanowires; nitrogen; physical chemistry; scanning electron microscopy; surface area; thermogravimetry; transmission electron microscopy
Abstract:
... Urchin-like Nb₂O₅ nanostructures have been successfully synthesized by a novel and simple l-arginine-assisted hydrothermal method. They are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM), nitrogen adsorption–desorption isotherms, thermogravimetric and differential thermal analysis (TG-DTA), and Fourier transfor ...
DOI:
10.1021/acs.jpcc.7b10312

39. Basic ionic liquid as catalyst and surfactant: green synthesis of quinazolinone in aqueous media

Author:
Yaping Zhang; Bin Zhen; Hansheng Li; Yaqing Feng
Source:
RSC advances 2018 v.8 no.64 pp. 36769-36774
ISSN:
2046-2069
Subject:
active sites; catalysts; catalytic activity; cyclohexanones; hydrophilicity; hydrophobicity; ionic liquids; micelles; sodium hydroxide; surface tension; surfactants
Abstract:
... Basic imidazolium-based ionic liquids not only possess the extraordinary physicochemical properties of ionic liquids, but also have excellent basicity and surfactivity. 1-Propyl-3-alkylimidazole hydroxide ionic liquids ([PRIm][OH]) were synthesized and their catalytic and surfactant behavior were studied in this work. [PRIm][OH] owned excellent surfactivity, and their alkyl chains and ion pairs be ...
DOI:
10.1039/c8ra06378h

40. Comparative study of the antioxidant properties of monocarbonyl curcumin analogues C66 and B2BrBC in isoproteranol induced cardiac damage

Author:
Nikola Hadzi-Petrushev; Jane Bogdanov; Jovanka Krajoska; Jovana Ilievska; Biljana Bogdanova-Popov; Elizabeta Gjorgievska; Vadim Mitrokhin; Ramadan Sopi; Hristo Gagov; Andre Kamkin; Mitko Mladenov
Source:
Life sciences 2018 v.197 pp. 10-18
ISSN:
0024-3205
Subject:
antioxidant activity; antioxidants; curcumin; cyclohexanones; energy; enzyme activity; geometry; heart; hypertrophy; lipid peroxidation; lipids; moieties; oxidative stress; protective effect; quantum mechanics; rats; superoxide dismutase; thiols
Abstract:
... To test the antioxidant properties of the newly synthesized (2E,6E)-2,6-bis(2-bromobenzylidene)cyclohexanone (B2BrBC) in parallel with C66 in rats with cardiac hypertrophy.The protective effects of both C66 and B2BrBC against oxidative stress in rats with cardiac hypertrophy, was studied by evaluating the activity of antioxidant enzymes, the relationship between the ratio of the activities of the ...
DOI:
10.1016/j.lfs.2018.01.028

41. Comprehensive Analysis of Oxidized Waxes by Solvent and Thermal Gradient Interaction Chromatography and Two-Dimensional Liquid Chromatography

Author:
Anthony Ndiripo; Harald Pasch
Source:
Analytical chemistry 2018 v.90 no.12 pp. 7626-7634
ISSN:
1520-6882
Subject:
chemical composition; cyclohexanones; decane; liquid chromatography; models; molecular weight; oxidation; polyethylene; protocols; silica gel; solvents; temperature; waxes
Abstract:
... This report addresses the comprehensive analysis of oxidized/functionalized polyethylene waxes according to chemical composition and molar mass by selective chromatographic methods. For the first time, tailored high-temperature interaction chromatography in solvent gradient (HT-SGIC) and thermal gradient (HT-TGIC) modes are used for the chemical composition separation of these materials. Separatio ...
DOI:
10.1021/acs.analchem.8b01480

42. Cycloketone condensation catalyzed by zirconia: Origin of reactant selectivity

Author:
Mi Wan; Decheng Liang; Li Wang; Xiangwen Zhang; Dong Yang; Guozhu Li
Source:
Journal of catalysis 2018 v.361 pp. 186-192
ISSN:
0021-9517
Subject:
atmospheric pressure; condensation reactions; cyclohexanones; polycyclic compounds; zirconium oxide
Abstract:
... Aldol condensation of cycloketone(s) is an efficient reaction path to synthesize polycyclic compounds via CC bond formation. In this work, aldol condensation of cyclopentanone and/or cyclohexanone over monoclinic ZrO₂ has been investigated by combination of experiments and DFT calculations. Both self-condensation and cross-condensation of cyclopentanone and/or cyclohexanone were carried out at 130 ...
DOI:
10.1016/j.jcat.2018.02.021

43. Formation and Fate of Carboxylic Acids in the Lignin-First Biorefining of Lignocellulose via H-Transfer Catalyzed by Raney Ni

Author:
Inês Graça; Robert T. Woodward; Marco Kennema; Roberto Rinaldi
Source:
ACS sustainable chemistry & engineering 2018 v.6 no.10 pp. 13408-13419
ISSN:
2168-0485
Subject:
biorefining; catalysts; cooking; cyclohexanones; formic acid; hydrogen; hydrogenation; isopropyl alcohol; lignin; lignocellulose; models; nickel; phenol; solvents; streams; sugar alcohols; xylan
Abstract:
... Lignin-first biorefining constitutes a new research field in which the overarching objective is the prevention of lignin recalcitrance while providing high-quality pulps. For this purpose, the solvent extraction of lignin is performed in the presence of a hydrogenation catalyst, employing H₂ pressure or an H-donor solvent (e.g., 2-propanol), and thus leading to passivation of reactive lignin fragm ...
DOI:
10.1021/acssuschemeng.8b03190

44. Green carbon nanostructured quantum resistive sensors to detect volatile biomarkers

Author:
K.M. Tripathi; A. Sachan; M. Castro; V. Choudhary; S.K. Sonkar; J.F. Feller
Source:
Sustainable materials and technologies 2018 v.16 pp. 1-11
ISSN:
2214-9937
Subject:
acetone; alcohols; benzene; biomarkers; carbon; carbon disulfide; castor oil; cyclohexanones; electronic nose; environmental monitoring; lungs; nanorods; polylactic acid; polyvinyl acetate; pyrolysis; signal-to-noise ratio; spraying; toxicity; vapors; volatile organic compounds
Abstract:
... Sensing volatile organic compounds (VOC) is a promising approach in particular for the development of non-invasive, fast and inexpensive tool for the anticipated diagnostic of diseases and monitoring of exposition to toxic molecules. This paper examines for the first time the potential of biobased carbon nanorods (CNR), synthesized by a simple and green method in gram scale via the pyrolysis of ca ...
DOI:
10.1016/j.susmat.2018.01.001

45. Inkjet printing of blue phosphorescent light-emitting layer based on bis(3,5-di(9H-carbazol-9-yl))diphenylsilane

Author:
Robert Bail; Ji Yoon Hong; Byung Doo Chin
Source:
RSC advances 2018 v.8 no.20 pp. 11191-11197
ISSN:
2046-2069
Subject:
aluminum; blue light; chlorobenzene; cyclohexanones; droplets; drying; iridium; molecular weight; phosphorescence; solvents
Abstract:
... In this study, micropatterning of a blue light emitting, tetraphenylsilane-based phosphorescent material by inkjet printing was investigated. Bis(3,5-di(9H-carbazol-9-yl))diphenylsilane (SimCP2) doped with iridium bis(4,6-difluorophenypyridinato)picolate (FIrpic) was dissolved in a solvent mixture, and various conditions for the solvent composition and drying of films were examined. Homogeneous do ...
DOI:
10.1039/c8ra00582f

46. Lewis Acid Catalyzed Conversion of 5-Hydroxymethylfurfural to 1,2,4-Benzenetriol, an Overlooked Biobased Compound

Author:
Angela J. Kumalaputri; Caelan Randolph; Edwin Otten; Hero J. Heeres; Peter J. Deuss
Source:
ACS sustainable chemistry & engineering 2018 v.6 no.3 pp. 3419-3425
ISSN:
2168-0485
Subject:
Lewis acids; aluminum chloride; aluminum oxide; benzene; carbohydrates; catalysts; catalytic activity; cyclohexanones; dimerization; feedstocks; hydroxymethylfurfural; iron; levulinic acid; oils; oxygen; zinc
Abstract:
... 5-Hydroxymethylfurfural (HMF) is a platform chemical that can be produced from renewable carbohydrate sources. HMF can be converted to 1,2,4-benzenetriol (BTO) which after catalytic hydrodeoxygenation provides a route to cyclohexanone and cyclohexanol. This mixture, known as KA oil, is an important feedstock for polymeric products such as nylons which use benzene as feedstock that is obtained from ...
DOI:
10.1021/acssuschemeng.7b03648
PubMed:
29607267
PubMed Central:
PMC5871338

47. Lipase-mediated direct in situ ring-opening polymerization of ε-caprolactone formed by a chemo-enzymatic method

Author:
Yuanyuan Zhang; Peiyu Lu; Qinghua Sun; Tao Li; Lanjie Zhao; Xin Gao; Fanye Wang; Junhong Liu
Source:
Journal of biotechnology 2018 v.281 pp. 74-80
ISSN:
0168-1656
Subject:
Trichosporon; carboxylic ester hydrolases; cyclohexanones; diatomaceous earth; dipotassium hydrogen phosphate; hydrogen peroxide; hydrophobicity; molecular weight; oxidation; polyethylene glycol; polymerization; solvents; temperature; toluene
Abstract:
... A novel method to synthesize poly(ε-caprolactone) (PCL) through a three-step, lipase-mediated chemo-enzymatic reaction from cyclohexanone using an immobilized lipase from Trichosporon laibacchii (T. laibacchii) CBS5791 was developed. The immobilized preparation with 1280 U· g⁻¹ used here was obtained by a method of purification and in situ immobilization where the crude intracellular lipase (cell ...
DOI:
10.1016/j.jbiotec.2018.06.338

48. Lipidic Mesophases as Novel Nanoreactor Scaffolds for Organocatalysts: Heterogeneously Catalyzed Asymmetric Aldol Reactions in Confined Water

Author:
Michael Duss; Livia Salvati Manni; Laurent Moser; Stephan Handschin; Raffaele Mezzenga; Henning J. Jessen; Ehud M. Landau
Source:
ACS applied materials & interfaces 2018 v.10 no.5 pp. 5114-5124
ISSN:
1944-8252
Subject:
benzaldehyde; biocompatible materials; biomimetics; catalytic activity; cyclohexanones; dispersions; electron microscopy; enantioselectivity; light scattering; lipids; small-angle X-ray scattering; water
Abstract:
... The unique molecular architecture of lipidic cubic phases (LCPs) and their cubosome dispersions comprise a well-defined, curved bilayer that spans the entire three-dimensional (3-D) material space, encompassing a network of two periodic, curved, and nonintersecting 3-D aqueous channels. The ensuing large lipid/water interfacial area makes these biomaterials an interesting matrix for the lateral im ...
DOI:
10.1021/acsami.7b19740

49. Mobile mass spectrometry for water quality monitoring of organic species present in nuclear waste ponds

Author:
Boris Brkić; Stamatios Giannoukos; Stephen Taylor; Darren F. Lee
Source:
Analytical methods 2018 v.10 no.48 pp. 5827-5833
ISSN:
1759-9679
Subject:
acetone; acetophenones; cyclohexanones; detection limit; ethyl acetate; industry; kerosene; mass spectrometry; monitoring; organic matter; pentanols; ponds; propionic acid; radioactive waste; spectrometers; toxicity; water quality
Abstract:
... This work uses a portable mass spectrometer (MS) for lab-based water quality monitoring of organic compounds, which are present in highly toxic nuclear waste ponds. This is due to a number of effects that such species have on storage of radioactive waste. The MS system that was used for the tests consists of a quadrupole mass spectrometer (QMS) housed in a mobile vacuum system with dual sample inl ...
DOI:
10.1039/c8ay02537a

50. Nano-V₂O₅/Ti porous membrane electrode with enhanced electrochemical activity for the high-efficiency oxidation of cyclohexane

Author:
Yujun Zhang; Yubo Qi; Zhen Yin; Hong Wang; Benqiao He; Xiaoping Liang; Jianxin Li; Zhenhuan Li
Source:
Green chemistry 2018 v.20 no.17 pp. 3944-3953
ISSN:
1463-9270
Subject:
catalysts; catalytic activity; chemical industry; cyclohexanones; electrochemistry; electrodes; electron transfer; green chemistry; hydroxyl radicals; nanoparticles; nanorods; nanosheets; oils; oxidation; surface area
Abstract:
... The selective oxidation of cyclohexane (CHA) is still a significant challenge in the field of current catalysis chemistry and chemical industry. Here, nano-V₂O₅/Ti porous membrane electrodes with different morphologies, i.e., nanorods (NRs), nanosheets (NSs), and nanoparticles (NPs), were prepared by loading nano-V₂O₅ onto porous Ti membranes. Simultaneously, a nano-V₂O₅/Ti membrane electrode was ...
DOI:
10.1039/c8gc01259h