D. Reyx, José Manuel Natário Martins, Irène Campistron
1995
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Journal
Macromolecular Chemistry and Physics
Abstract
The coupling of dichloromethylphenylsilane (1) with chlorotrimethylsilane (2) by lithium is considered for the synthesis of low-molecular-weight organosilane polymers 3 and for the preparation of heptamethylphenyl-2-trisilane (3a) and octamethyldiphenyl-2,3-tetrasilane (3b). Size-exclusion chromatography, ultraviolet and infrared spectroscopies and nuclear magnetic resonance (1H, 13C and 29Si NMR) analyses of the crude product 3 were performed and compared with those of 3a and 3b. According to the spectroscopic characteristics of heptamethyltetrakis(trimethylsilyl)-3,4,5,6-cyclohex-1-enyl-2-trisilane (4), and the observed silylation of the trisilane 3a when it is submitted to the action of a (CH3)3SiCl/Li/tetrahydrofuran system, the silylation of the phenyl ring during the reductive condensation of the chlorosilanes is supported by NMR identification of 4-like structures.