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You searched for: Subject ambient temperature Remove constraint Subject: ambient temperature Subject term cyclohexanones Remove constraint Subject term: cyclohexanones
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1. Experimental and Theoretical Studies of Ultrafine Pd-Based Biochar Catalyst for Dehydrogenation of Formic Acid and Application of In Situ Hydrogenation

Author:
Liangyu Zou; Qi Liu; Daoyun Zhu; Yangqiang Huang; Yu Mao; Xiao Luo; Zhiwu Liang
Source:
ACS applied materials & interfaces 2022 v.14 no.15 pp. 17282-17295
ISSN:
1944-8252
Subject:
ambient temperature; ammonium oxalate; biochar; carbon; carboxymethylcellulose; cyclohexanones; dehydrogenation; density functional theory; formic acid; hydrogen; hydrogenation; nanocatalysts; palladium; phenol; phosphoric acid; sodium bicarbonate
Abstract:
... In this work, a novel “foaming” strategy uses sodium bicarbonate (NaHCO₃) and ammonium oxalate ((NH₄)₂C₂O₄) as the foaming agent, turning biomass-derived carboxymethyl cellulose (CMC) into N-doped porous carbon. Highly active palladium nanoparticles (Pd NPs) immobilized on nitrogen-doped porous carbon (Pd@MC(2)-P) are produced through a phosphate-mediation approach. The phosphoric acid (H₃PO₄) bec ...
DOI:
10.1021/acsami.2c00343

2. A triple cascade approach towards the diastereoselective synthesis of spiro trans-decalinol scaffolds

Author:
Poorna Chandrasekhar Settipalli; Shaik Anwar
Source:
Chemical communications 2022 v.58 no.74 pp. 10400-10403
ISSN:
1364-548X
Subject:
ambient temperature; carbon; cyclohexanones; diastereoselective synthesis; diastereoselectivity
Abstract:
... A [2+2+2] annulation reaction between cyclohexanone, β-nitrostyrene and 2-arylidene-1,3-indanedione afforded multisubstituted spiro trans-decalinol derivatives in high chemical yields (up to 75%) and excellent diastereoselectivity (up to >20 : 1) at room temperature. This one-pot three-component system follows a triple cascade sequence via the Michael/nitro-Michael/Aldol process, resulting in the ...
DOI:
10.1039/d2cc03562f

3. Construction of Indium Oxide/N-Doped Titanium Dioxide Hybrid Photocatalysts for Efficient and Selective Oxidation of Cyclohexane to Cyclohexanone

Author:
Kuan Wang; Bing Xue; Jun-Lei Wang; Zhen-Hong He; Song-Song Li; Dan Wang; Wei-Tao Wang; Yang Yang; Zhao-Tie Liu
Source:
Journal of physical chemistry 2021 v.125 no.36 pp. 19791-19801
ISSN:
1932-7455
Subject:
absorption; ambient temperature; atmospheric pressure; cyclohexanones; density functional theory; durability; indium; light; lighting; photocatalysis; photocatalysts; photooxidation; titanium dioxide
Abstract:
... Photocatalytic oxidation of cyclohexane (CHA) to generate cyclohexanone (CHA-one) is one of the most important strategic links for the production of nylon-6 and nylon-66. Herein, an indium oxide/N-doped titanium dioxide (In₂O₃/N-TiO₂) hybrid photocatalyst with a p–n heterointerface was successfully constructed by a two-step strategy of the hydrothermal N-doped method and impregnation method with s ...
DOI:
10.1021/acs.jpcc.1c05730

4. Influence of temperature on storage characteristics of different rice varieties

Author:
Qingyu Zhao; Hui Guo; Dianzhi Hou; Yousaf Laraib; Yong Xue; Qun Shen
Source:
Cereal chemistry 2021 v.98 no.4 pp. 935-945
ISSN:
0009-0352
Subject:
ambient temperature; catalase; cyclohexanones; endosperm; ethyl acetate; flavor; hydrolysis; lipid peroxidation; microstructure; odors; rancidity; rice; spectroscopy; stored grain; sulfides
Abstract:
... BACKGROUND AND OBJECTIVES: In order to study the influence of temperature on storage characteristics of different rice varieties, the physicochemical properties, microstructure morphology, and aroma were investigated at 300d of storage at 15℃, room temperature (20–25 ℃), and 37℃. FINDINGS: High temperature can promote the hydrolysis of fat, inhibit the catalase activity, and cause rough surface of ...
DOI:
10.1002/cche.10435

5. Metal-free and iron(II)-assisted oxidation of cyclohexane to adipic acid with ozone: A theoretical mechanistic study

Author:
Maxim L. Kuznetsov; Armando J.L. Pombeiro
Source:
Journal of catalysis 2021 v.399 pp. 52-66
ISSN:
0021-9517
Subject:
adipic acid; ambient temperature; anhydrides; catalysts; catalytic activity; cyclohexanones; iron; oxidation; ozone
Abstract:
... Adipic acid has a tremendous applied importance. Its industrial synthesis requires harsh conditions and application/emission of hazardous HNO₃ and N₂O. Here, a mechanism of ecologically benign neat cyclohexane (CyH) oxidation with ozone into adipic acid under room temperature and radiation-free conditions, both metal-free and catalyzed by the iron(II) complex [FeCl₂{κ³-HC(pz)₃}] (pz = pyrazol-1-yl ...
DOI:
10.1016/j.jcat.2021.04.030

6. Promoted catalytic hydrodechlorination for deep degradation of chlorophenols over Rh-La/SiO2 catalyst

Author:
Jun Xiong; Lei Tian; Ruijie Cheng
Source:
Journal of hazardous materials 2021 v.416 pp. 125913
ISSN:
0304-3894
Subject:
ambient temperature; catalysts; catalytic activity; chlorophenols; cyclohexanones; dechlorination; hydrogenation; particle size; phenol; wastewater treatment
Abstract:
... Deep degradation of chlorophenols (CPs) into safe and ecofriendly cyclohexanol during catalytic hydrodechlorination (HDC), shows important practical significance and attractive prospect in the treatment of wastewater containing chlorophenols. An efficient Rh-La/SiO₂ catalyst was developed, by employing La as promoter. The presence of La in catalyst promoted catalytic performance of HDC significant ...
DOI:
10.1016/j.jhazmat.2021.125913

7. Hierarchical zeolites comprising orthogonally stacked bundles of zeolite nanosheets for catalytic and adsorption applications

Author:
Albert Chang; Tsung-Cheng Yang; Ming-Yi Chen; Hsu-Ming Hsiao; Chia-Min Yang
Source:
Journal of hazardous materials 2020 v.400 pp. 123241
ISSN:
0304-3894
Subject:
adsorption; ambient temperature; catalytic activity; cyclohexanones; hydrogenation; nanocatalysts; nanocomposites; nanosheets; phenol; zeolites
Abstract:
... The synthesis of hierarchical MFI zeolites comprising orthogonally stacked bundles of zeolite nanosheets using a new type of triblock structure-directing agents (SDAs) was reported. The textural properties, including the degree of nanosheet branching and the spacing between adjacent nanosheets, could be controlled by changing the length of the linkers in the triblock SDAs. The hierarchical pure-si ...
DOI:
10.1016/j.jhazmat.2020.123241

8. Stereoselective synthesis of novel functionalized cyclohexanone derivatives via the condensation of aromatic aldehydes with acetoacetamide and the influence of the ortho-effect and autocondensation

Author:
Vladimir L. Gein; Natalia V. Nosova; Andrei N. Yankin; Alina Y. Bazhina; Maksim V. Dmitriev
Source:
Tetrahedron letters 2019 pp. -
ISSN:
0040-4039
Subject:
Lewis acids; aldehydes; ambient temperature; aromatic compounds; bismuth; catalysts; chemical reactions; chemical structure; cyclohexanones; ethanol; ferric chloride; iron; nitrates; piperidines; stereoselective synthesis
Abstract:
... A simple, inexpensive and stereoselective synthesis of novel functionalized cyclohexanone derivatives via the reaction of acetoacetamide with aromatic aldehydes in ethanol at room temperature is described. Additionally, the presence of substituents such as –NO2 and –Cl in the ortho-position of the aldehyde aromatic ring resulted in the formation of novel piperidines. The use of Lewis acids such as ...
DOI:
10.1016/j.tetlet.2019.05.023

9. 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

10. 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

11. Production of renewable long-chained cycloalkanes from biomass-derived furfurals and cyclic ketones

Author:
Qiying Liu; Caihong Zhang; Ning Shi; Xinghua Zhang; Chenguang Wang; Longlong Ma
Source:
RSC advances 2018 v.8 no.25 pp. 13686-13696
ISSN:
2046-2069
Subject:
additives; ambient temperature; aviation; biomass; carbon; carbon dioxide; catalysts; cellulose; condensation reactions; cyclohexanones; diesel fuel; furfural; greenhouse gas emissions; hemicellulose; hydrogenation; hydroxymethylfurfural; lignin; lignocellulose; liquids; oxygen; palladium; phenol; phosphates; sodium hydroxide; zirconium
Abstract:
... Developing renewable long-chain cycloalkanes from lignocellulosic biomass is of significance because it offers huge resource storage, wide applications in aviation/diesel fuels and mitigation of CO₂ emissions. In this paper, cycloalkanes with carbon chain lengths of 13–18 were produced from biomass-derived furfural species (furfural and 5-hydroxymethylfurfural) and cyclic ketones (cyclopentanone a ...
DOI:
10.1039/c8ra01723a

12. 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

13. 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

14. Eliminative Deoxofluorination Using XtalFluor-E: A One-Step Synthesis of Monofluoroalkenes from Cyclohexanone Derivatives

Author:
Vandamme Mathilde; Paquin Jean-François
Source:
Organic letters 2017 v.19 no.13 pp. 3604-3607
ISSN:
1523-7052
Subject:
ambient temperature; chemical reactions; chemical structure; cost effectiveness; cyclohexanones
Abstract:
... The eliminative deoxofluorination of cyclohexanone derivatives using XtalFluor-E is described. The corresponding monofluoroalkenes are obtained in up to 79% yield. Notably, this one-step procedure occurs at room temperature using readily accessible and cost-effective reagents. ...
DOI:
10.1021/acs.orglett.7b01581

15. Acid-Induced Room Temperature RAFT Polymerization: Synthesis and Mechanistic Insights

Author:
Joke Vandenbergh; Bertrand Schweitzer-Chaput; Martin Klussmann; Tanja Junkers
Source:
Macromolecules 2016 v.49 no.11 pp. 4124-4135
ISSN:
1520-5835
Subject:
ambient temperature; composite polymers; cyclohexanones; free radicals; mass spectrometry; polymerization; polystyrenes; styrene
Abstract:
... An acid-induced cyclohexanone/tert-butylhydroperoxide initiation system for ambient temperature reversible addition–fragmentation transfer (RAFT) polymerization of vinyl monomers is presented. The reaction system is optimized for the synthesis of poly(n-butyl acrylate) of various chain length. The polymerization shows typical living characteristics and polymers with dispersities close to 1.1 are o ...
DOI:
10.1021/acs.macromol.6b00192

16. Ag₃PW₁₂O₄₀/C₃N₄ nanocomposites as an efficient photocatalyst for hydrocarbon selective oxidation

Author:
Yalin Zhang; Lulu Hu; Shunyan Zhao; Naiyun Liu; Liang Bai; Juan Liu; Hui Huang; Yang Liu; Zhenhui Kang
Source:
RSC advances 2016 v.6 no.65 pp. 60394-60399
ISSN:
2046-2069
Subject:
ambient temperature; carbon nitride; catalytic activity; cyclohexanones; hydrogen peroxide; hydroxyl radicals; irradiation; nanocomposites; oxidants; oxidation; photocatalysts; silver nitrate; surface area; synergism
Abstract:
... Ag₃PW₁₂O₄₀/C₃N₄ nanocomposites were successfully synthesized by loading Ag₃PW₁₂O₄₀ into C₃N₄, in which case Ag₃PW₁₂O₄₀ is gained through reaction between AgNO₃ and H₃PW₁₂O₄₀ at room temperature. The obtained nanocomposites show efficient and light-operated catalytic activity for hydrocarbon selective oxidation (selective oxidation of cyclooctene and cyclohexane) without adding any oxidant at 60 °C ...
DOI:
10.1039/c6ra09235g

17. Efficient oxidation and epoxidation using a chromium(VI)-based magnetic nanocomposite

Author:
Ali Maleki; Rahmatollah Rahimi; Saied Maleki
Source:
Environmental chemistry letters 2016 v.14 no.2 pp. 195-199
ISSN:
1610-3653
Subject:
X-radiation; X-ray diffraction; ambient temperature; benzaldehyde; benzyl alcohol; catalysts; catalytic activity; chromium; coprecipitation; cyclohexanones; cyclohexenes; epoxides; fluorescence; gas chromatography-mass spectrometry; hydrogen peroxide; irradiation; nanocomposites; oxidation; scanning electron microscopy; ultrasonics
Abstract:
... The oxidation of alcohols and alkenes to aldehydes, ketones and epoxides is a major reaction in organic synthesis, but is usually hard to perform due to the lack of efficient methods. The use of ultrasounds may improve yield because ultrasonic-assisted reactions are often more efficient than traditional methods. Here, we prepared a hybrid chromium(VI)-based magnetic nanocomposite catalyst by co-pr ...
DOI:
10.1007/s10311-016-0558-2

18. Two-Step Excitation-Driven Au–TiO2–CuO Three-Component Plasmonic Photocatalyst: Selective Aerobic Oxidation of Cyclohexylamine to Cyclohexanone

Author:
Akashi Ryo; Naya Shin-ichi; Negishi Ryo; Tada Hiroaki
Source:
The Journal of Physical Chemistry C 2016 v.120 no.49 pp. 27989-27995
ISSN:
1932-7455
Subject:
air; ambient temperature; amines; cupric oxide; cyclohexanones; electrochemistry; electrons; heat; nanogold; oxidation; photocatalysis; photocatalysts; physical chemistry; surface plasmon resonance; titanium dioxide
Abstract:
... The chemisorption of (acetylacetonato)copper(II) on gold-nanoparticle- (Au-NP-) loaded rutile TiO₂ and subsequent heating in the air at 773 K yields molecular-scale CuO clusters on the TiO₂ surface with varying CuO loading amounts (Au/TiO₂–CuO) (J. Phys. Chem. C 2013, 117, 23848−23857). The three-component Au/TiO₂–CuO plasmonic photocatalyst exhibits a high level of visible-light activity for the ...
DOI:
10.1021/acs.jpcc.6b08774

19. An investigation on the aqueous-phase hydrodeoxygenation of various methoxy-substituted lignin monomers on Pd/C and HZSM-5 catalysts

Author:
Cong Zhang; Jingbo Qi; Jing Xing; Si-Fu Tang; Liang Song; Yuanyuan Sun; Chuanhui Zhang; Hongchuan Xin; Xuebing Li
Source:
RSC advances 2016 v.6 no.106 pp. 104398-104406
ISSN:
2046-2069
Subject:
Bronsted acids; ambient temperature; catalysts; cyclohexanones; guaiacol; hydrogen; hydrogenation; hydrolysis; lignin; models; moieties; palladium; phenol
Abstract:
... Aqueous phase catalytic upgrading of lignin monomers to hydrocarbons via hydrodeoxygenation (HDO) has been explored using a combination of Pd/C and HZSM-5 catalysts under 2 MPa of H₂ (ambient temperature). Model monomers with varying numbers of methoxy groups, including phenol, anisole, guaiacol and 2,6-dimethoxy-phenol, were chosen as lignin model compounds. Mechanistic studies revealed cascade a ...
DOI:
10.1039/c6ra22492j

20. Noncovalent catalysis of glucose-containing imidazolium salt in solvent-free one-pot synthesis of Ortho-aminocarbonitriles

Author:
Li-zhuo Zhang; Yu Wan; Xiao-xiao Zhang; Hao Cui; Huan Zou; Qiu-ju Zhou; Hui Wu
Source:
Tetrahedron letters 2015 v.56 no.34 pp. 4934-4937
ISSN:
0040-4039
Subject:
aldehydes; ambient temperature; bromides; catalytic activity; chemical reactions; chemical structure; cyclohexanones; organobromine compounds; synthesis
Abstract:
... A glucose-containing imidazolium salt β-1-imidazole-2,3,4,6-tetraacetyl-D-glucopyranosyl bromide was firstly used as efficient noncovalent organocatalyst to promote the solvent-free preparation of ortho-aminocarbonitriles via a four-component condensation of aromatic aldehyde, cyclohexanone, and 2equiv of malononitrile at room temperature. Seven bonds were cleaved while four new bonds were formed ...
DOI:
10.1016/j.tetlet.2015.06.094

21. One-pot room-temperature conversion of cyclohexane to adipic acid by ozone and UV light

Author:
Kuo Chu Hwang; Arunachalam Sagadevan
Source:
Science 2014 v.346 no.6216 pp. 1495-1498
ISSN:
0036-8075
Subject:
adipic acid; ambient temperature; cyclohexanones; irradiation; nitric acid; nitrous oxide; ozone; ultraviolet radiation
Abstract:
... Nitric acid oxidation of cyclohexane accounts for ~95% of the worldwide adipic acid production and is also responsible for ~5 to 8% of the annual worldwide anthropogenic emission of the ozone-depleting greenhouse gas nitrous oxide (N ₂O). Here we report a N ₂O-free process for adipic acid synthesis. Treatment of neat cyclohexane, cyclohexanol, or cyclohexanone with ozone at room temperature and 1 ...
DOI:
10.1126/science.1259684

22. Resin-immobilized pyrrolidine-based chiral organocatalysts for asymmetric Michael additions of ketones and aldehydes to nitroolefins

Author:
Richeng Zhang; Guohui Yin; Yang Li; Xilong Yan; Ligong Chen
Source:
RSC advances 2014 v.5 no.5 pp. 3461-3464
ISSN:
2046-2069
Subject:
adsorption; aldehydes; ambient temperature; catalytic activity; chemical reactions; cyclohexanones; enantioselectivity; organocatalysts; resins; solvents
Abstract:
... Based on the electrostatic adsorption between acidic resins and organocatalysts, a series of resin-supported chiral organocatalysts were designed and synthesized. They were evaluated for the asymmetric Michael addition of cyclohexanone with nitrostyrene, in which, catalyst 3 (Fig. 1) exhibited the best catalytic performance. This reaction proceeded under catalyst 3 smoothly at room temperature wit ...
DOI:
10.1039/c4ra10684a

23. Vanillic Mannich bases: synthesis and screening of biological activity. Mechanistic insight into the reaction with 4-chloroaniline

Author:
Vladimir P. Petrović; Dušica Simijonović; Marko N. Živanović; Jelena V. Košarić; Zorica D. Petrović; Svetlana Marković; Snežana D. Marković
Source:
RSC advances 2014 v.4 no.47 pp. 24635-24644
ISSN:
2046-2069
Subject:
2,2-diphenyl-1-picrylhydrazyl; ambient temperature; aniline; antioxidant activity; breast neoplasms; catalytic activity; cell lines; colorectal neoplasms; cyclohexanones; cytotoxicity; density functional theory; diastereoselectivity; ethanol; ethanolamine; free radical scavengers; humans; ionic liquids; neoplasm cells; oxidative stress; screening; vanillin
Abstract:
... One-step multi-component Mannich reaction of vanillin, aromatic amines (aniline and 4-chloroaniline), and cyclohexanone was successfully catalyzed by three chloroacetate ethanolamine based ionic liquids: diethanolammonium chloroacetate, and newly synthesized ethanolammoniumchloroacetate and N,N-diethylethanolammoniumchloroacetate. These reactions were performed in ethanol at room temperature. Mech ...
DOI:
10.1039/c4ra03909b

24. Rapid synthesis of gold nanostructures with cyclic and linear ketones

Author:
William J. Peveler; Ivan P. Parkin
Source:
RSC advances 2013 v.3 no.44 pp. 21919-21927
ISSN:
2046-2069
Subject:
acetone; ambient temperature; aqueous solutions; colloids; cyclohexanones; enols; isomers; nanogold; solubility
Abstract:
... Colloidal gold nanoparticles were synthesised in aqueous solution by reaction of chloroauric acid with a range of simple aliphatic cyclic (cyclopentanone, cyclohexanone, cycloheptanone and cyclohexanedione) and linear (acetone and 3-hexanone) ketone reagents, at room temperature. The rate of reaction and particle morphology was found to be controlled by the enol content and solubility of the keton ...
DOI:
10.1039/c3ra44842h

25. Selective hydrogenation of phenol and derivatives over an ionic liquid-like copolymer stabilized palladium catalyst in aqueous media

Author:
Aibing Chen; Guoying Zhao; Jinzhu Chen; Limin Chen; Yifeng Yu
Source:
RSC advances 2013 v.3 no.13 pp. 4171-4175
ISSN:
2046-2069
Subject:
ambient temperature; atmospheric pressure; catalysts; composite polymers; cyclohexanones; hydrogen; hydrogenation; hydroxylation; nanoparticles; palladium; phenol; phosphotungstic acid
Abstract:
... A combination of “water soluble” palladium nanoparticles stabilized by an ionic liquid-like copolymer and phosphotungstic acid synergistically promotes selective hydrogenation of phenol to cyclohexanone. The nanocatalyst preparation and selective phenol hydrogenation are successfully combined into a one-pot process in this research. Conversion exceeding 99% was achieved with >99% selectivity under ...
DOI:
10.1039/c3ra21663b

26. Sensing ionic liquids for chemoselective detection of acyclic and cyclic ketone gases

Author:
Yen-Liang Liu; Ming-Chung Tseng; Yen-Ho Chu
Source:
Chemical communications 2013 v.49 no.25 pp. 2560-2562
ISSN:
1364-548X
Subject:
acetone; ambient temperature; biomarkers; chemical communication; chemical reactions; chemoselectivity; cyclohexanones; explosives; gases; ionic liquids
Abstract:
... Based on specific chemical reactions carried out at ambient temperature, an ultrasensitive and chemoselective measurement of both acyclic and cyclic ketone gases, such as acetone (a disease biomarker) and cyclohexanone (a signature chemical emanating from C-4 plastic explosives), in real time was efficiently achieved on QCM chips thin-coated with sensing ionic liquids. ...
DOI:
10.1039/c3cc39255d

27. Solvent-Free Enantioselective Friedländer Condensation with Wet 1,1′-Binaphthalene-2,2′-diamine-Derived Prolinamides as Organocatalysts

Author:
Bañón-Caballero Abraham; Guillena Gabriela; Nájera Carmen
Source:
Journal of organic chemistry 2013 v.78 no.11 pp. 5349-5356
ISSN:
1520-6904
Subject:
Lewis acids; aldehydes; ambient temperature; aromatic compounds; cyclohexanones; enantiomers; silica gel
Abstract:
... Wet unsupported and supported 1,1′-binaphthalene-2,2′-diamine (BINAM) derived prolinamides are efficient organocatalysts under solvent-free conditions at room temperature to perform the synthesis of chiral tacrine analogues in good yields (up to 93%) and excellent enantioselectivies (up to 96%). The Friedländer reaction involved in this process takes place with several cyclohexanone derivatives a ...
DOI:
10.1021/jo400522m

28. Thermal hazard analysis of cyclohexanone peroxide and its solutions

Author:
N. Zang; X.M. Qian; P. Huang; C.M. Shu
Source:
Thermochimica acta 2013 v.568 no. pp. 175-184
ISSN:
0040-6031
Subject:
calorimeters; thermal conductivity; hazard characterization; chemical reactions; finite element analysis; ambient temperature; manufacturing; fires; cyclohexanones; differential scanning calorimetry; explosions; chemical industry; heat transfer; prediction; China
Abstract:
... Cyclohexanone peroxide (CYHPO) is widely used in the chemical industry, but unfortunately, as an organic peroxide, it has been involved in many serious fires and explosions in daily manufacturing, storage, and transportation. We present an advanced methodology of application of thermal analysis for thermal hazard investigation of complex chemical reactions. The applied method is based on a differe ...
DOI:
10.1016/j.tca.2013.06.036

29. The room temperature formation of gold nanoparticles from the reaction of cyclohexanone and auric acid; a transition from dendritic particles to compact shapes and nanoplates

Author:
Madeeha A. Uppal; Andreas Kafizas; Michael B. Ewing; Ivan P. Parkin
Source:
Journal of materials chemistry A 2013 v.1 no.25 pp. 7351-7359
ISSN:
2050-7496
Subject:
X-ray diffraction; ambient temperature; aqueous solutions; byproducts; carbon; chromatography; cyclohexanones; gases; gold; infrared spectroscopy; nanogold; nanoparticles; nuclear magnetic resonance spectroscopy; organic chemistry; stable isotopes; transmission electron microscopy
Abstract:
... A new straightforward method for the synthesis of gold nanoparticles from addition of cyclohexanone to aqueous solutions of auric acid at room temperature is presented. By understanding this process we have discovered a new organic chemistry transformation reaction for converting cyclic ketones to α-chloro ketones and a mechanism for the nanoparticle formation. Contrary to conventional gold nanopa ...
DOI:
10.1039/c3ta11546a

30. Metal chlorides-catalyzed selective oxidation of cyclohexane by molecular oxygen under visible light irradiation

Author:
Wenfeng Wu; Xiangling He; Zaihui Fu; Yachun Liu; Yanlong Wang; Xinglang Gong; Xiaolin Deng; Haitao Wu; Yanhong Zou; Ningya Yu; Dulin Yin
Source:
Journal of catalysis 2012 v.286 no. pp. 6-12
ISSN:
0021-9517
Subject:
acetone; acetonitrile; ambient temperature; cyclohexanones; cyclohexenes; ferric chloride; hydrochloric acid; irradiation; oxygen; photocatalysis; photooxidation; solvents
Abstract:
... The development of mild and efficient process for the selective oxidation of organic compounds with molecular oxygen can be one of the key technologies for synthesizing oxygenates. Here, a visible light-driven metal chloride to catalyze the selective oxidation of cyclohexane was carried out at ambient temperature under a pure O₂ atmosphere. Among the metal salts examined, only a few metal chloride ...
DOI:
10.1016/j.jcat.2011.09.034

31. Room temperature selective oxidation of cyclohexane over Cu-nanoclusters supported on nanocrystalline Cr₂O₃

Author:
Bipul Sarkar; Pragati Prajapati; Rahul Tiwari; Ritesh Tiwari; Shilpi Ghosh; Shankha Shubhra Acharyya; Chandrashekar Pendem; Rajib Kumar Singha; L. N. Sivakumar Konathala; Jagdish Kumar; Takehiko Sasaki; Rajaram Bal
Source:
Green chemistry 2012 v.14 no.9 pp. 2600-2606
ISSN:
1463-9270
Subject:
X-ray absorption spectroscopy; X-ray diffraction; X-ray photoelectron spectroscopy; ambient temperature; catalysts; cetyltrimethylammonium bromide; copper; copper nanoparticles; cyclohexanones; green chemistry; hydrogen peroxide; nanocrystals; oxidants; oxidation; scanning electron microscopy; surfactants; transmission electron microscopy
Abstract:
... Cu-nanoclustures supported on nanocrystalline Cr₂O₃ were prepared by a hydrothermal synthesis method in the presence of surfactant, cetyltrimethylammonium bromide (CTAB). It was found that the catalyst is highly active for the selective oxidation of cyclohexane with H₂O₂ at room temperature. The catalyst was characterized by XRD, ICP-AES, XPS, TPR, BET-surface area, SEM, TEM and EXAFS. The effect ...
DOI:
10.1039/c2gc35658a

32. Takovite–Aluminosilicate–Cr Materials Prepared by Adsorption of Cr3+ from Industrial Effluents As Catalysts for Hydrocarbon Oxidation Reactions

Author:
Ciuffi Katia J.; de Faria Emerson H.; Marçal Liziane; Rocha Lucas A.; Calefi Paulo S.; Nassar Eduardo J.; Pepe Iuri; Rocha Zênis N. da; Vicente Miguel A.; Trujillano Raquel; Gil Antonio; Korili Sophia A.
Source:
ACS Applied Materials & Interfaces 2012 v.4 no.5 pp. 2525-2533
ISSN:
1944-8252
Subject:
adsorbents; adsorption; ambient temperature; aqueous solutions; catalysts; catalytic activity; cations; chromium; coprecipitation; cyclohexanones; hydrogen peroxide; industrial effluents; nanocomposites; oxidation
Abstract:
... The catalytic efficiency of takovite–aluminosilicate–chromium catalysts obtained by adsorption of Cr³⁺ ions from aqueous solutions by a takovite–aluminosilicate nanocomposite adsorbent is reported. The adsorbent was synthesized by the coprecipitation method. The catalytic activity of the final Cr–catalysts depended on the amount of adsorbed chromium. (Z)-cyclooctene conversion up to 90% with total ...
DOI:
10.1021/am300227z

33. Cellulose nanocrystallites as an efficient support for nanoparticles of palladium: application for catalytic hydrogenation and Heck coupling under mild conditions

Author:
Ciprian M. Cirtiu; Alexandre F. Dunlop-Brière; Audrey Moores
Source:
Green chemistry 2011 v.13 no.2 pp. 288-291
ISSN:
1463-9270
Subject:
ambient temperature; catalysts; catalytic activity; cellulose; cyclohexanones; green chemistry; hydrogenation; iodobenzenes; nanocrystallites; nanoparticles; palladium; phenol; solvents; styrene; wood pulp
Abstract:
... We report herein the synthesis of a new hybrid material, PdNPs@CNCs consisting of monodisperse Pd nanoparticles (PdNPs) evenly deposited onto colloidal cellulose nanocrystallites (CNCs). This material proved an active catalyst for the hydrogenation reaction of phenol to cyclohexanone in water as a solvent, at room temperature, under 4 bar of dihydrogen. Moreover, the catalyst perfomed well in the ...
DOI:
10.1039/c0gc00326c