53264-56-5Relevant articles and documents
OLEFIN METATHESIS OF ALKENYLSILANES. II. ON THE INITIATION OF OLEFIN METATHESIS WITH ORGANOSILANES
Berglund, Mats,Andersson, Carlaxel,Larsson, Ragnar
, p. 61 - 74 (2007/10/02)
A study has been made of the cross-metathesis of alkenylsilanes CH2=CH(CH2)nSiX3 (n=1,2; X=CH3, Cl, OMe) with (Z)-2-pentene with WCl6 as the catalyst precursor.For allyltrimethylsilane (ATMS; n=1, X=CH3) the reaction proceeds without added co-catalyst but with an induction period.The catalytically-active intermediate in this case is formed by allyl-group transfer from Si to W, as revealed by the formation of ClSiMe3.Allyltrichlorosilane and allyltrimethoxysilane requires the addition of an alkylating co-catalyst, e.g.SnMe4.Addition of a Lewis acid, e.g.AlCl3 or AlBr3, show that for ATMS removes the induction period and substantially raises the activity.The initial activity and the E/Z-stereoselectivity are affected in a very similar way by the addition of the Lewis acid.The results indicate that the Lewis acid participates in the initiating, propagating, and terminating steps of the reaction.
OLEFIN METATETHESIS OF ALKENYLTRIMETHYLSILANES
Berglund, Mats,Andersson, Carlaxel,Larsson, Ragnar
, p. C15 - C17 (2007/10/02)
WCl6 has been used as a catalyst for the metathesis of various alkenylsilanes and the degree of conversion found to be dependent on the distance between the olefinic bond and the silyl group.The first observation of metathetical conversion of allyltrimethylsilane in the absence of a co-catalyst is reported.
