Copper(II) bromide as efficient catalyst for silyl- to bisarylmethyl ethers interconversion (transprotection)
摘要:
Primary and secondary silylated alcohols are easily converted to bis(methoxyphenyl)methyl (BMPM) ethers in good yields using CuBr2 as catalyst in acetonitrile at room temperature. Various other protecting groups are compatible with this mild and convenient process. (C) 2011 Elsevier Ltd. All rights reserved.
Action des trialkylsilanes sur les aldehydes aliphatiques
作者:Rolland Bourhis、Emile Frainnet
DOI:10.1016/s0022-328x(00)89613-8
日期:1975.2
Two competing reactions ensue when trialkylsilanes HSiR′3 are treated with aliphatic aldehydes RCHO in the absence of a solvent and using a nickel catalyst (obtained by the treatment of anhydrous NiCl2 with a trialkylsilane); one gives an alcoxysilane RCH2OSiR′3, the other an ether oxide (RCH2)2O and a siloxane (R′3Si)2O. By variation of the reaction conditions, either reaction can be made exclusive
Hydrosilylation of epoxides catalyzed by a cationic η1-silane iridium(iii) complex
作者:Sehoon Park、Maurice Brookhart
DOI:10.1039/c0cc05714b
日期:——
Cationic silane complex 2, catalyzes the hydrosilylation of epoxides and cyclic ethers to give the silyl-protected alcohols, regioselectively. A mechanistic study shows that the epoxide undergoes isomerization to the ketone, followed by hydrosilylation.
Nanoparticulate intermetallic compound Ni3Ga supported on SiO2 has emerged as a highly efficient catalyst for the hydrosilylation of carbonyls, such as aldehydes and ketones, at room temperature.
The action of triethylsilane on α-ethylenic aldehydes has been studied in the presence of two types of nickel catalysts as well as palladium on charcoal. Two phenomena can result: either 1,2 or 1,4 additions only, the trans-1,4 adduct being predominant, or a competition between these two additions and coupling reactions. A comparative regioselective and stereoselective study was carried out making