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You searched for: Publication Year 2018 Remove constraint Publication Year: 2018 Subject ambient temperature Remove constraint Subject: ambient temperature Subject term cyclohexanones Remove constraint Subject term: cyclohexanones
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1. 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

2. 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

3. 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

4. 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

5. 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