The Synthesis and Properties of α,ω-Dihydrocarbyl Substituted Permethylpolysilanes

Abstract

Abstract: Eighteen sym- and unsym-a,w-dihydrocarbyl substituted permethylpoly-silane were synthesized by means of the reaction of a, w-dichloropermethylpolysi-lane and the corresponding Grignard reagents. The IRspectral data showed that the C=CH₂out-of-plane bending bands of vinyl substituted compounds are ～13cm^-1larger than that of the corresponding allylic compounds, it may be interpreted by the d_si-π effect. The UVspectral bathochromic shift of vinyl substituted permeth-ylpolysilane is greater than that of the corresponding allylic compounds,it is due to the σ_si-si-π^* conjugative effect. The rearranged fragments of ArRMeSi⁺⁺. appeared in the MSspectra of some of these compounds.The peaks of ArRMe₂Si⁺⁺. are the base peaks.It showed that the stability of Ar-Si bonds has been enhanced by the d_is-π effect.

Key words: a,w-Dihydrocarbyl substituted permethylpolysilanes, d_sl-&pi, effect, σ_si-si-&pi, conjungative effect, Bathochromic shift

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Guo Yuping, Xu Shansheng, Zbou Xiuzhong . The Synthesis and Properties of α,ω-Dihydrocarbyl Substituted Permethylpolysilanes[J]. Chem. J. Chinese Universities, 1989, 10(1): 51.

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The Synthesis and Properties of α,ω-Dihydrocarbyl Substituted Permethylpolysilanes

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