Organocatalytic living ring-opening polymerization of cyclic carbosiloxanes

被引：95
|
作者：
Lohmeijer, Bas G. G.
Dubois, Geraud
Leibfarth, Frank
Pratt, Russell C.
Nederberg, Fredrik
Nelson, Alshakim
Waymouth, Robert M.
Wade, Charles
Hedrick, James L.
机构：
[1] IBM Corp, Almaden Res Ctr, San Jose, CA 95123 USA
[2] Stanford Univ, Dept Chem, Stanford, CA 94305 USA
来源：
ORGANIC LETTERS | 2006年 / 8卷 / 21期
关键词：
D O I：
10.1021/ol0614166
中图分类号：
O62 [有机化学];
学科分类号：
070303 ; 081704 ;
摘要：
An organocatalytic route to narrowly dispersed poly(carbosiloxanes) of predictable molecular weight and end group fidelity is described. N-Heterocyclic carbenes (NHC) and 1,5,7-triazabicyclo[4.4.0]dec-5-ene (TBD) catalyze the ring opening of cyclic carbosiloxanes. The pK(b) of the catalyst is important in preventing adverse transetherification reactions and obtaining well-defined polymers. Mechanistic studies indicate that hydrogen bonding to TBD or the NHC activates alcohols or silanols for ring-opening reactions.
引用
收藏
页码：4683 / 4686
页数：4
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