Versatile method for introduction of bulky substituents to alkoxychlorosilanes
作者:Shin Masaoka、Tadashi Banno、Mitsuo Ishikawa
DOI:10.1016/j.jorganchem.2005.08.030
日期:2006.1
The reactions of various alkoxytrichlorosilanes prepared in situ from tetrachlorosilane and alcohols, with Grignardreagentsbearing a bulky substituent such as the isopropyl, sec-butyl, and cyclohexyl group afforded triisopropyl-, tri(sec-butyl)-, and tricyclohexylalkoxysilane in high yields. The reactions of n-butoxytrichlorosilane with these Grignardreagents produced triisopropyl-, tri(sec-butyl)-
The synthesis of chlorosilanes from alkoxysilanes, silanols, and hydrosilanes with bulky substituents
作者:Shin Masaoka、Tadashi Banno、Mitsuo Ishikawa
DOI:10.1016/j.jorganchem.2005.08.028
日期:2006.1
trialkylchlorosilanes can readily be synthesized by the reaction of alkoxysilanes, silanols, and hydrosilanes with aqueous concentrated hydorochloric acid. Treatment of trialkylalkoxysilanes bearing the bulky alkyl substituents, such as the i-Pr, sec-Bu, tert-Bu, and cyclo-Hex group, with 35% aqueous hydrochloric acid afforded the corresponding trialkylchlorosilanes in excellent yields. Similar treatment of trialkylsilanols
The reduction of derivatives of the type RnSiσ4-n (σ = Cl, OCH3) by some organomagnesium compounds RMgX at high temperature (⩾80°) leads to the hydrosilanes RR'SiH2 and RR'2SiH in various ratios according to the considered reagents. The results described in this publication constitute a first approach in the knowledge of the mechanism of these reductions. A deeper study of the mechanism is the subject
chloride proceeds by two simultaneous processes: the direct reduction by the organomagnesium compound and the indirect reduction by the magnesium hydride coming from the thermic decomposition of the Grignardreagent. These results can be generalised to the reductive action of various sterically hindered Grignardreagents: R=C6H11, C5H9, i-C3H7.
在温度> 100°时,叔丁基氯化镁将R 3SiΣ型三有机硅烷(ΣCl或OCH 3)转化为氢硅烷R 3 SiH的过程同时进行两个过程:有机镁化合物的直接还原和间接的格氏试剂的热分解导致氢化镁还原。这些结果可以推广到各种空间受阻的格氏试剂的还原作用:R = C 6 H 11,C 5 H 9,iC 3 H 7。