نتایج جستجو برای: epoxides

تعداد نتایج: 1664  

Maryam Gorjizadeh, Mohammad Azarkish Mozhgan Afshari

1,4-bis(triphenylphosphonium)-2-butene dichloride was developed as a new phase transfer catalyst. This quaternized phosphonium salt catalyzed the regioselective ring opening of epoxides by thiocyanate ion to give β-hydroxy thiocyanates in high yields under mild conditions.

Journal: :Chemical communications 2004
Leilani L Welbes Robert C Scarrow A S Borovik

Template copolymerization methods have been utilized to prepare porous materials with immobilized cobalt complexes that catalyze the hydrolytic kinetic resolution of epoxides.

Journal: :Chemical communications 2003
Hongda Zhao Brian L Pagenkopf

The stereospecific and regioselective C(3) alkynylation of trisubstituted epoxides has been achieved with lithium alkynyl trimethylaluminium ate complexes in the presence of BF3 x OEt2.

Journal: :Chemical communications 2011
Philipp Winter Jörg Swatschek Matthieu Willot Lea Radtke Tobias Olbrisch Andreas Schäfer Mathias Christmann

Merging Jørgensen's and MacMillan's organocatalytic aldehyde chlorinations enables the synthesis of chiral vinylcyclopropanes and (-)-cis-aerangis lactone via terpene-derived 1,2-epoxides.

Journal: :Organic letters 2009
Emeline Vedrenne Olov A Wallner Maxime Vitale Frank Schmidt Varinder K Aggarwal

Lithiated epoxides react stereospecifically with boronic esters to give syn-1,2-diols, a process that can be used iteratively to create triols containing four stereogenic centers.

2014
Huixin Liu Renqin Zeng Ruimao Hua

An efficient coupling reaction of epoxides with CO2 affording cyclic carbonates with the use of 2,2',2''-terpyridine as catalyst under solvent-free conditions has been developed.

Journal: :Chemical communications 2009
Kohji Suda Shin-Ichiro Nakajima Yasumi Satoh Toshikatsu Takanami

The metallophthalocyanine complex Cr(TBPC)OTf works as a highly efficient, recyclable Lewis acid catalyst for the regio- and stereoselective rearrangements of epoxides to aldehydes.

Journal: :Dalton transactions 2009
Hiroharu Ajiro Kathryn L Peretti Emil B Lobkovsky Geoffrey W Coates

Mechanistic studies have revealed that the isospecific polymerization of epoxides by a discrete salen cobalt(III) catalyst occurs at the surface of the undissolved, crystalline complex.

Journal: :Environmental Health Perspectives 1996
S Osterman-Golkar J A Bond

The 1990 Clean Air Act Amendments list several volatile organic chemicals as hazardous air pollutants, including ethylene oxide, butadiene, styrene, and acrylonitrile. The toxicology of many of these compounds shares several common elements such as carcinogenicity in laboratory animals, genotoxicity of the epoxide intermediates, involvement of cytochrome P450 for metabolic activation (except et...

Journal: :Cancer research 1983
H Glatt T Friedberg P L Grover P Sims F Oesch

Four glutathione transferases (EC 2.5.1.18), glutathione transferases A, B, and C and a hitherto unknown form, termed X, were purified to apparent homogeneity from rat liver cytosol. They were investigated for their abilities to inactivate two mutagenic epoxides derived from the polycyclic aromatic hydrocarbon benz(a)anthracene, the K-region epoxide benz(a)anthracene 5,6-oxide and the diol-epox...

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