Amino-functionalized zirconocene (C5H4CH(Me)NMe2)2ZrCl2, a catalyst for the dehydropolymerization of PhSiH3
作者:Brian J Grimmond、Joyce Y Corey
DOI:10.1016/s0020-1693(01)00738-1
日期:2002.3
The amino-functionalized metallocene (C5H4CH(Me)NMe2)(2)ZrCl, [(Cp-N)(2)ZrCl2] was synthesized by salt metathesis of ZrCl4 and 2 equiv. of C5H4CH(Me)NMe2Li. The metallocene was obtained in good yield as a mixture of rac and meso diastereomers as established by NMR spectroscopy. The addition of 2 equiv. of n-BuLi to the metallocene (Cp-N)(2)ZrCl2 produced a co-catalyst system which was active, at a 1.0 mol% loading, in the dehydropolymerization of PhSiH3 to poly(phenylsilane), PPSi. The PPSi was obtained as a 9:1 linear-cyclic mixture (M-w = 3850, M-n = 2300) as established by GPC analysis; Si-29H-1} NMR spectroscopy revealed an atactic polymer microstructure. (C) 2002 Elsevier Science B.V. All rights reserved.