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Synlett 1999; 1999(11): 1772-1774
DOI: 10.1055/s-1999-2950
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Synthesis of Polysilacage Compounds Containing a Trisilane Bridge

Masaki Shimizu* , Shuji Ishizaki, Hisashi Nakagawa, Tamejiro Hiyama
  • *Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan; E-mail: shimizu@npc05.kuic.kyoto-u.ac.jp
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Publication Date:
31 December 1999 (online)

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Reductive lithiation of 1,1,5,5-tetrakis(phenylthio)-2,2,3,3,4,4-hexamethyl-2,3,4-trisilapentane or deprotonation of 1,5-bis(phenylthio)-2,2,3,3,4,4-hexamethyl-2,3,4-trisilapentane gave 1,5-bis(phenylthio)-1,5-dilithio-2,2,3,3,4,4-hexamethyl-2,3,4-trisilapentane which was silylated with dichlorodimethylsilane or 1,2-dichloro-1,1,2,2-tetramethyldisilane to give the corresponding tetrasilacyclohexane or pentasilacycloheptane, respectively. The tetrasilacyclohexane was transformed by reductive lithiation and sequential silylation to 2,2,3,3,4,4,6,6,7,7-decamethyl-2,3,4,6,7-pentasilabicyclo[3.1.1]heptane and 2,2,3,3,4,4,6,6,7,7,8,8-dodecamethyl-2,3,4,6,7,8-hexasilabicyclo[3.2.1]octane.

silicon - lithium - dianion - trisilane - cyclizations