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: Subject ambient temperature Remove constraint Subject: ambient temperature Subject term cyclohexanones Remove constraint Subject term: cyclohexanones
Start Over

Search

33  Search Results

« Previous | 1 - 20 of 33 |
Number of results to display per page

Search Results

1. 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

2. 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

3. 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

4. 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

5. 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

6. 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

7. 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

8. 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

9. 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

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. 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

12. 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

13. 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

14. 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

15. 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

16. 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

17. 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

18. 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

19. 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

20. 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