Synthesis of polysilanes bearing pendant carbosilyl groups and 29Si-NMR probe on the tacticity using side chain silicon atoms

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Date
2002
Authors
Shankar, Ravi
Saxena, Anubhav
Brar, Ajaib S
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Abstract
New functional polysilanes [R2R1Si(CH2)2SiH]n (R=Me, R1=H (1); R=R1=Et (2); R=Me, R1=Ph (3)) bearing carbosilyl side chains have been synthesized by catalytic dehydropolymerization of precursor carbosilanes R2R1SiCH2CH2SiH3 using Cp2TiCl2–BuLi as a catalyst. These polymers are characterized by 1H, 13C, 29Si, {1H–29Si} HSQC NMR spectroscopy, GPC and TGA. Attempts to delineate the tacticity from the analysis of deconvoluted 29Si{1H}-NMR signals associated with the side chain silicon atoms reveal that the triad concentration ratio follows a Bernoullian statistical model for polymers 1 and 2 only.
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Carbosilane, Hydrosilylation, Dehydropolymerization, Microstructure, Deconvolution
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