Journal of Integrative Natural Science (통합자연과학논문집)

The Basic Science Institute Chosun University (조선대학교 기초과학연구원)
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Dehydrocoupling of Bis(silyl)alkylbenzenes to Network Polysilanes, Catalyzed by Group 4 Metallocene Combination

  • Kim, Myoung-Hee (Department of Chemistry and Nanotechnology Research Center, Chonnam National University) ;
  • Lee, Jun (Department of Chemistry and Nanotechnology Research Center, Chonnam National University) ;
  • Moo, Soo-Yong (Department of Chemistry and Nanotechnology Research Center, Chonnam National University) ;
  • Kim, Jong-Hyun (Department of Chemistry and Nanotechnology Research Center, Chonnam National University) ;
  • Ko, Young Chun (School of Liberal Arts, Daebul University) ;
  • Woo, Hee-Gweon (Department of Chemistry and Nanotechnology Research Center, Chonnam National University)
  • Received : 2010.02.11
  • Accepted : 2010.03.20
  • Published : 2010.03.31
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Abstract

Bis(silyl)alkylbenzenes such as bis(1-sila-sec-butyl)benzene (1) and 2-phenyl-1,3-disilapropane (2) were synthesized in high yields by the reduction of the corresponding chlorosilanes with $LiAlH_4$ in diethyl ether. The dehydrocoupling of 1 and 2 was performed using group IV metallocene complexes generated in situ from $Cp_2MCl_2$/Red-Al and $Cp_2MCl_2$/n-BuLi (M = Ti, Hf), producing two phases of polymers. The TGA residue yields of the insoluble polymers were in the range of 64-74%. The molecular weights of the soluble polymers produced ranged from 700 to 5000 ($M_w$ vs polystyrene using GPC) and from 500 to 900 ($M_w$ vs polystyrene using GPC). The dehydropolymerization of 1 and 2 seemed to initially produce a low-molecular-weight polymer, which then underwent an extensive cross-linking reaction of backbone Si-H bonds, leading to an insoluble network polymer.

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