A new and efficient method for the synthesis of bromosilanes from hydrosilanes using Br3CCOOEt/PdCl2 as the catalyst
摘要:
Bromosilanes were prepared conveniently and efficiently via the reaction of hydrosilanes and Br3CCOOEt in the presence of a catalytic amount of PdCl2 in refluxing THE over 15 min in high yields. The developed methodology was further applied for the one-pot synthesis of silyl ethers and silyl esters in excellent yields. (C) 2011 Elsevier Ltd. All rights reserved.
A mild and efficient method for the selective deprotection of silyl ethers using KF in the presence of tetraethylene glycol
作者:Hailong Yan、Joong-Suk Oh、Choong Eui Song
DOI:10.1039/c1ob06300f
日期:——
efficient protocol for the deprotection of silylethers using KF in tetraethylene glycol is reported. A wide range of alcoholic silylethers can be selectively cleaved in high yield in the presence of certain acid- and base-labile functional groups. Moreover, the phenolic silylethers were cleaved exclusively, without affecting the alcoholic silylethers, at room temperature.
Synergistic Catalysis by Brønsted Acid/Carbodicarbene Mimicking Frustrated Lewis Pair‐Like Reactivity
作者:Yi‐Chen Chan、Yuna Bai、Wen‐Ching Chen、Hsing‐Yin Chen、Chen‐Yu Li、Ying‐Yann Wu、Mei‐Chun Tseng、Glenn P. A. Yap、Lili Zhao、Hsuan‐Ying Chen、Tiow‐Gan Ong
DOI:10.1002/anie.202107127
日期:2021.9
Carbodicarbene (CDC), unique carbenic entities bearing two lone pairs of electrons are well-known for their strong Lewis basicity. We demonstrate herein, upon introducing a weak Brønstedacid benzyl alcohol (BnOH) as a co-modulator, CDC is remolded into a Frustrated Lewis Pair (FLP)-like reactivity. DFT calculation and experimental evidence show BnOH loosely interacting with the binding pocket of CDC
Ruthenium catalyzed selective hydrosilylation of aldehydes
作者:Basujit Chatterjee、Chidambaram Gunanathan
DOI:10.1039/c3cc47593j
日期:——
A chemoselective hydrosilylation method for aldehydes is developed using a ruthenium catalyst [(Ru(p-cymene)Cl2)2] and triethylsilane; a mono hydride bridged dinuclear complex [(η6-p-cymene)RuCl}2(μ-H-μ-Cl)] and a Ru(IV) mononuclear dihydride complex [(η6-p-cymene)Ru(H)2(SiEt3)2] are identified as potential intermediates in the reaction and the proposed catalytic cycle involves a 1,3-hydride migration.
2,2,6,6-tetramethylpiperidine, alkanenitriles undergo direct addition to aldehydes under mild non-basic neutral conditions to provide triisopropylsilyl ethers of β-hydroxy nitriles in good yield. The reaction proceeds through generation of an N-silyl ketene imine intermediate in situ from the alkanenitrile followed by nucleophilic addition of the intermediate to the aldehyde.