نتایج جستجو برای: olefins

تعداد نتایج: 2875  

Journal: :Environmental science & technology 2008
Hongzhi R Zhang Eric G Eddings Adel F Sarofim

To study the formation of air pollutants and soot precursors (e.g., acetylene, 1,3-butadiene, benzene, and higher aromatics) from aliphatic and aromatic fractions of gasoline fuels, the Utah Surrogate Mechanisms is extended to include submechanisms of gasoline surrogate compounds using a set of mechanism generation techniques. The mechanism yields very good predictions of species concentrations...

Journal: :Journal of the American Chemical Society 2006
Jérôme Waser Boris Gaspar Hisanori Nambu Erick M Carreira

The discovery, study, and implementation of the Co- and Mn-catalyzed hydrohydrazination and hydroazidation reactions of olefins are reported. These reactions are equivalent to direct hydroaminations of C-C double bonds with protected hydrazines or hydrazoic acid but are based on a different concept in which the H and the N atoms come from two different reagents, a silane and an oxidizing nitrog...

2017
Yuichiro Ashida Atsushi Honda Yuka Sato Hidefumi Nakatsuji Yoo Tanabe

A highly substrate-general synthesis of all-carbon-substituted E- and Z-stereodefined olefins is performed. The method comprises two sets of parallel and stereocomplementary preparations of (E)- and (Z)-α,β-unsaturated esters involving two robust and distinctive reactions: 1) stereocomplementary enol tosylations using readily available TsCl/diamine/(LiCl) base reagents, and 2) stereoretentive N...

Journal: :Chemical Communications 2021

Nickel-catalyzed Heck reaction of cycloalkenes produces uncommon isomers with aryl rings in conjugation olefins.

Journal: :Organic letters 2007
Jacob M Berlin Katie Campbell Tobias Ritter Timothy W Funk Anatoly Chlenov Robert H Grubbs

[structure: see text]. Increased efficiency for ring-closing metathesis to form tetrasubstituted olefins using N-heterocyclic carbene ligated ruthenium catalysts was achieved by reducing the size of the substituents at the ortho positions of the N-bound aryl rings.

Journal: :Chemical communications 2005
So-Hye Cho Nolan D Walther SonBinh T Nguyen Joseph T Hupp

Catechol-functionalized (salen)Mn complexes can be supported on mesoporous anodized aluminium oxide disks to yield catalytic membranes that are highly active in the enantioselective epoxidation of olefins when being deployed in a forced-through-flow reactor.

Journal: :Chemical communications 2002
Yu Fu Jian-Hua Xie Ai-Guo Hu Hai Zhou Li-Xin Wang Qi-Lin Zhou

Novel monodentate phosphorus ligands containing the 1,1'-spirobiindane backbone have been synthesized and applied in the asymmetric rhodium-catalyzed hydrogenation of functionalized olefins, providing excellent enantioselectivities (up to 99.3% ee).

Journal: :Chemical communications 2008
Manza B J Atkinson Dejan-Kresimir Bucar Anatoliy N Sokolov Tomislav Friscić Chanceity N Robinson Mahmood Y Bilal Naif G Sinada Asher Chevannes Leonard R MacGillivray

Supermolecules with olefins organized by hydrogen-bond donor and acceptor templates and that react in the solid state rapidly form co-crystals via solvent-free and liquid-assisted grinding.

Journal: :Chemistry 2015
Damir A Safin Amélie Pialat Ilia Korobkov Muralee Murugesu

An unprecedented trinuclear heteroleptic Ag(I) complex was isolated using a stable multidentate 2,4,6-tris(2-pyrimidyl)-1,3,5-triazine (TPymT) ligand. The obtained compound is an efficient catalyst for the direct aziridination of terminal olefins.

Journal: :Chemical communications 2015
Siyu Guo Peng Yang Jianrong Steve Zhou

Asymmetric transfer hydrogenation of electron-deficient olefins is realized with nickel catalysts supported by strongly σ-donating bisphosphines. Deuterium labeling experiments point to a reaction sequence of formate decarboxylation, asymmetric hydride insertion and non-stereoselective protonation of resulting nickel enolates.

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