Abstract
The amino-functionalized metallocene (C 5H 4CH(Me)NMe 2) 2ZrCl 2, [(Cp N) 2ZrCl 2] was synthesized by salt metathesis of ZrCl 4 and 2 equiv. of C 5H 4CH(Me)NMe 2Li. 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) 2ZrCl 2 produced a co-catalyst system which was active, at a 1.0 mol% loading, in the dehydropolymerization of PhSiH 3 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; 29Si{ 1H} NMR spectroscopy revealed an atactic polymer microstructure.
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