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 rev 7982-2018 Remove constraint Publication year rev: 7982-2018 Subject term cyclohexanones Remove constraint Subject term: cyclohexanones Subject term catalytic activity Remove constraint Subject term: catalytic activity Text availability Citation in PubAg Remove constraint Text availability: Citation in PubAg
Start Over

Search

22  Search Results

1 - 22 of 22
Number of results to display per page

Search Results

1. 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

2. 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

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. 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

5. 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

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. 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

8. 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

9. 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

10. 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

11. 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

12. 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

13. 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

14. 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

15. 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

16. 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

17. Silica gel-immobilized multidisciplinary materials applicable in stereoselective organocatalysis and HPLC separation

Author:
J. Tůma; M. Kohout
Source:
RSC advances 2018 v.8 no.3 pp. 1174-1181
ISSN:
2046-2069
Subject:
catalytic activity; chemical reactions; chemical species; chemoselectivity; cyclohexanones; high performance liquid chromatography; models; organocatalysts; silica; stereoselectivity
Abstract:
... In this pilot study, we present novel bifunctional silica gel-immobilized materials applicable as heterogeneous organocatalysts and stationary phases in HPLC. The materials provided high stereoselectivity in both batch and continuous flow catalysis of a model Michael addition (cyclohexanone to (E)-β-nitrostyrene). In the batch reaction, the catalysts proved their sustainable catalytic activity ove ...
DOI:
10.1039/c7ra12658a

18. 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

19. Synthesis and properties of a POM-based trinuclear copper(ii) triazole framework

Author:
Li Xu; Ying Lu; Liping Huang; Xiaohui Li; Shuang Wang; Zhong Zhang; Shuxia Liu
Source:
RSC advances 2018 v.8 no.4 pp. 2034-2040
ISSN:
2046-2069
Subject:
Fourier transform infrared spectroscopy; Lewis acids; anions; catalytic activity; copper; cyclohexanones; equations; ethylene; ferrimagnetic materials; hot water treatment; hydrogen; ligands; magnetism; photolysis; semiconductors; thermogravimetry; triazoles
Abstract:
... A novel POM-based trinuclear copper(ii) triazole framework, namely, [H₂{Cu₆(trz)₆(μ₃-OH)₂}Mo₅O₁₈]·3H₂O (1) was isolated using a hydrothermal method, which displays a 3D network constructed from trinuclear copper(ii) units and triazole ligands with [Mo₅O₁₈]⁶⁻ anions as templates. 1 has been identified by single crystal X-ray diffraction, elemental analysis, thermogravimetric analysis, powder X-ray ...
DOI:
10.1039/c7ra12150d

20. 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

21. Tackling Challenges in Industrially Relevant Homogeneous Catalysis: The Catalysis Research Laboratory (CaRLa), an Industrial–Academic Partnership

Author:
Thomas Schaub; A. Stephen K. Hashmi; Rocco A. Paciello
Source:
Journal of organic chemistry 2018 v.84 no.8 pp. 4604-4614
ISSN:
1520-6904
Subject:
amination; carbon dioxide; catalytic activity; chemical structure; cyclohexanones; organic chemistry; sodium
Abstract:
... Industrial–academic collaborations are broadly used for the development of new industrial processes. To achieve a strong and deep collaboration in the field of homogeneous catalysis, BASF and the Heidelberg University have been running the Catalysis Research Laboratory together in Heidelberg since 2006. This Perspective highlights the concept of this laboratory and our experiences over the past fe ...
DOI:
10.1021/acs.joc.8b02362

22. 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