Polysilanes fonctionnels, 4. Duplication réductrice de chlorosilanes par le lithium pour la synthèse d'α,ω-bis(triméthylsilyl) oligo(méthylphénylsilane)s. Réactions parasites de silylation des noyaux phényle

✍ Scribed by Danièle Reyx; José Manuel Natário Martins; Irène Campistron; Patrick Noireaux

• Publisher: John Wiley and Sons
• Year: 1995
• Tongue: English
• Weight: 866 KB
• Volume: 196
• Category: Article
• ISSN: 1022-1352
• DOI: 10.1002/macp.1995.021960109

✦ Synopsis

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 (3 a) and octarnethyldiphenyl-2,3-tetrasilane (3 b). Size-exclusion chromatography, ultraviolet and infrared spectroscopies and nuclear magnetic resonance ('H, I3C and 29Si NMR) analyses of the crude product 3 were performed and compared with those of 3a and 3 b. 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),SiC1/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. a) Partie 3: cf. ref.2