نتایج جستجو برای: silylation

تعداد نتایج: 439  

Journal: :Journal of the American Chemical Society 2017
Shibdas Banerjee Yun-Fang Yang Ian D Jenkins Yong Liang Anton A Toutov Wen-Bo Liu David P Schuman Robert H Grubbs Brian M Stoltz Elizabeth H Krenske Kendall N Houk Richard N Zare

Exploiting C-H bond activation is difficult, although some success has been achieved using precious metal catalysts. Recently, it was reported that C-H bonds in aromatic heterocycles were converted to C-Si bonds by reaction with hydrosilanes under the catalytic action of potassium tert-butoxide alone. The use of Earth-abundant potassium cation as a catalyst for C-H bond functionalization seems ...

2016
Serena Traboni Emiliano Bedini Alfonso Iadonisi

tert-Butyldimethylsilyl (TBDMS) and tert-butyldiphenylsilyl (TBDPS) are alcohol protecting groups widely employed in organic synthesis in view of their compatibility with a wide range of conditions. Their regioselective installation on polyols generally requires lengthy reactions and the use of high boiling solvents. In the first part of this paper we demonstrate that regioselective silylation ...

Journal: :Chemical communications 2008
Euan A F Fordyce Yi Wang Thomas Luebbers Hon Wai Lam

A variety of cyclopropenes undergo direct silylation using (trifluoromethyl)trimethylsilane in the presence of a copper-bisphosphine catalyst; under these conditions, cyclopropenes that might otherwise undergo ring-opening are silylated efficiently.

Journal: :Chemical communications 2005
Dae Jung Kim Brian C Dunn Paul Cole Greg Turpin Richard D Ernst Ronald J Pugmire Min Kang Ji Man Kim Edward M Eyring

The silylation of SBA-15 enhances the reducibility of cobalt oxides on a SBA-15 supported cobalt catalyst, and consequently increases the catalytic activity for Fischer-Tropsch synthesis of hydrocarbons from syngas and selectivity for longer chain products.

Journal: :Organic letters 2010
Roman Shchepin Chunping Xu Patrick Dussault

B(C(6)F(5))(3) promotes regio- and stereoselective cyclizations of unsaturated alkoxysilanes to generate oxasilinanes and oxasilepanes. The same products are available directly from alkenols via tandem silylation and hydrosilylation.

Journal: :Squalen Bulletin of Marine and Fisheries Postharvest and Biotechnology 2022

The mangrove fungus Trichoderma atroviride was found to be tolerant the heavy metal cadmium and it is of high interest profile its metabolites gain insight into response toxicity. This study aimed investigate effect derivatization agents on number types present in cadmium-tolerant T. atroviride, detected using GC-MS analysis. intracellular extracellular treated with for ten days were derivatize...

2013
P. Jutzi C. Batz A. Mutluay

P. Jutzi*, C. Batz, A. Mutluay Fakultät für Chemie der Universität, Universitätsstraße 25, D-33615 Bielefeld Herrn Prof. Dr. H. Schmidbaur zum 60. Geburtstag gewidmet Z. Naturforsch. 49b, 1689-1692 (1994); received May 17, 1994 Octasilsesquioxanes, Hydrosilylation, Siloxanes, Ferrocenes, Carboranes Eightfold functionalized octasilsesquioxanes (R8Si80 12) are synthesized using the hydro­ silylat...

2016
Wojciech I. Dzik

Recently, homogeneous cobalt systems were reported to catalyze the reductive silylation of dinitrogen. In this study the investigations on the silylation of dinitrogen catalyzed by CoH(PPh3)3N2 are presented. We show that in the presence of the title compound, the reaction of N2 with trimethylsilylchloride and sodium yields, on average, 6.7 equivalents of tris(trimethylsilyl)amine per Co atom i...

1,1’-(Ethane-1,2-diyl)dipyridinium bistribromide (EDPBT) was used as a chemoselective and effective organocatalyst for the silylation of hydroxyl groups as well as desilylation of trimethylsilyl ethers under mild conditions at room temperature with good to excellent yields.

Journal: :Journal of occupational health 2004
Grazyna Bieniek Slawomir Kurkiewicz Tadeusz Wilczok

A method for the qualitative analysis of aromatic hydrocarbons in air and their various urinary metabolites is presented. The air was sampled in charcoal tubes and extracted with carbon disulfide. The hydrocarbons were identified as being aliphatic hydrocarbons (C(9)-C(19)), aromatic hydrocarbons and heterocyclic compounds. The urinary metabolites after enzymatic hydrolysis were analyzed by sol...

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