A New, Simple, and Selective Palladium-Catalyzed Cleavage of Triethylsilyl Ethers
摘要:
[GRAPHICS]A simple procedure for the cleavage of triethylsilyl (TES) ethers in the presence of 10 wt % Pd/C in methanol or 95% ethanol is reported. This method allows selective removal of alkyl TES ethers in the presence of aromatic TES ethers or tert-butyldimethylsilyl (TBS) protecting groups.
A Convenient and Efficient Rhenium-Catalyzed Hydrosilylation of Ketones and Aldehydes
作者:Hailin Dong、Heinz Berke
DOI:10.1002/adsc.200900246
日期:2009.8
The easily available rhenium(I) complex [Re(CH3CN)3Br2(NO)] catalyzes the homogeneous hydrosilylation of a great variety of organic carbonyl compounds (ketones and aldehydes). The reaction is quite sensitive to the solvent applied. Chlorobenzene was found to be superior over all the other solvents used. Various aliphatic and aromatic silanes were tested. Excellent yields were achieved at 85 °C in chlorobenzene
易于获得的rh(I)络合物[Re(CH 3 CN)3 Br 2(NO)]催化多种有机羰基化合物(酮和醛)的均相氢化硅烷化。该反应对所施加的溶剂非常敏感。发现氯苯优于所用的所有其他溶剂。测试了各种脂肪族和芳香族硅烷。使用三乙基硅烷,在85°C的氯苯中,获得了优异的收率,该反应的TOF值高达495 h -1。提出了可能的氢化硅烷化反应机理。
Gold(I)−Phosphine Catalyst for the Highly Chemoselective Dehydrogenative Silylation of Alcohols
[reaction: see text] A gold(I) complex of Xantphos AuCl(xantphos) catalyzes the dehydrogenativesilylation of alcohols with high chemoselectivity and solvent tolerance. It is selective for the silylation of hydroxyl groups in the presence of alkenes, alkynes, alkyl halides (RCl, RBr), ketones, aldehydes, conjugated enones, esters, and carbamates.
Versatile Dehydrogenative Alcohol Silylation Catalyzed by Cu(I)−Phosphine Complex
作者:Hajime Ito、Akiko Watanabe、Masaya Sawamura
DOI:10.1021/ol050559+
日期:2005.4.1
[reaction: see text] Cu(I) complexes of xanthane-based diphosphines were versatile catalysts for dehydrogenative alcohol silylation, exhibiting high activity and broad substrate scope. Highlyselectivesilylation of 1-decanol over 2-decanol is possible even with a silylating reagent of small steric demand such as HSiMe(2)Ph or HSiEt(3).