نتایج جستجو برای: hydrogenation mechanism

تعداد نتایج: 573485  

Journal: :journal of food biosciences and technology 2015
p. parsania m. ghavami a. heydari-nasab m. gharachorloo

hydrogenation of oils might be considered as the largest reaction in the edible oil industry. the reaction consists of the addition of hydrogen at the double bounds of fatty acids. although for some reasons this might be considered a desirable reaction but for some others it might create problems in the food and nutrition chain circle due to the formation of saturated and trans fatty acids. soy...

Journal: :Chemical communications 2014
Ahmed F Abdel-Magied Amrendra K Singh Matti Haukka Michael G Richmond Ebbe Nordlander

Enantioselective hydrogenation of tiglic acid effected by diastereomers of the general formula [(μ-H)2Ru3(μ3-S)(CO)7(μ-P-P*)] (P-P* = chiral Walphos diphosphine ligand) strongly supports catalysis by intact Ru3 clusters. A catalytic mechanism involving Ru3 clusters has been established by DFT calculations.

Journal: :Dalton transactions 2018
De-Ming Rao Shi-Tong Zhang Chang-Ming Li Yu-Di Chen Min Pu Hong Yan Min Wei

Intermetallic compounds (IMCs) have shown excellent catalytic performance toward the selective hydrogenation of acetylene, but the theoretical understanding on this reaction over Ni-based IMCs is rather limited. In this work, the adsorptions of the C2 species, Bader charge, projected density of states (PDOS) and the reaction pathways were calculated by the density functional theory (DFT) method...

Journal: :Chemical communications 2012
Yasutomo Segawa Douglas W Stephan

The frustrated Lewis pair, B(C(6)F(5))(3)/Ph(2)PC(6)F(5), acts as an efficient catalyst for the hydrogenation of the polycyclic hydrocarbons including anthracene derivatives, tetracene and tetraphene, at 80 °C and 100 atm H(2) pressure via a mechanism involving protonation of polyaromatic species followed by hydride transfer.

Journal: :Chemical communications 2014
Adrian Y Houghton Virve A Karttunen Warren E Piers Heikki M Tuononen

The perfluorinated boraindene was synthesized and fully characterized. Both computational and crystallographic data show that is antiaromatic. Compound was shown to react reversibly with H2 and to catalyse the hydrogenation of cyclohexene. The mechanism of catalysis was probed experimentally and computationally.

Journal: :Catalysis Science & Technology 2023

The detailed mechanism for ruthenium-catalysed selective reduction of cardanol derivatives by transfer hydrogenation has been fully characterised at the B3PW91-D3/ECP2/PCM//B3PW91/ECP1 level density functional theory.

2007
E. H. PRYDE

l-Nonanol and alkyl 9-hydroxynonanoates were more readily prepared by hydrogenation of the respective isolated aldehydes than by direct hydrogenation of products from reductive ozonolysis of oleate esters. Hydrogenation with nickel catalysts and aprotic solvents reduced the isolated aldehydes in good yield with a minimum of side reactions. Although the noble metal catalyst and hydroxylic solven...

Journal: :Chemical science 2015
Chong Liu Jian-Hua Xie Gui-Long Tian Wei Li Qi-Lin Zhou

A new iridium catalyst containing an imine-diphosphine ligand has been developed, which showed high efficiency for the hydrogenation of CO2 to formate (yield up to 99%, TON up to 450 000). A possible catalytic mechanism is proposed, in which the imine group of the catalyst plays a key role in the cleavage of H2 and the activation of CO2.

Journal: :Angewandte Chemie 2011
Robert Langer Yael Diskin-Posner Gregory Leitus Linda J W Shimon Yehoshoa Ben-David David Milstein

A highly active iron catalyst for the hydrogenation of carbon dioxide and bicarbonates works under remarkably low pressures and achieves activities similar to some of the best noble metal catalysts. A mechanism is proposed involving the direct attack of an iron trans-dihydride on carbon dioxide, followed by ligand exchange and dihydrogen coordination.

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