Chemoselectivity in the Dehydrocoupling Synthesis of Higher Molecular Weight Polysilanes

Materials

Florian Lunzer¹ 

[1] Institut für Anorganische Chemie, Technische Universität Graz, Stremayrgasse 16, A-8010 Graz, Austria; E-Mail

关键词: polysilane;    catalysis;    group 4 metallocene;    dehydrocoupling polymerization;   

DOI  :  10.3390/ma3021125

来源: mdpi

【 摘 要 】

The Cp₂ZrCl₂/2 BuLi catalyzed co-polymerization of H₂MeSiSiMeH₂ and PhSiH₃ was compared to the homo-polymerization of H₂MeSiSiPhH₂. In contrast to the co-polymerization, which gave molecular weights comparable to homo-polymerization of phenylsilane, the reaction of 1-methyl-2-phenyldisilane yielded a partially cross-linked high molecular weight polymer with very broad molecular weight distribution. A higher reactivity of phenyl-substituted silicon atoms compared to methyl-substituted ones was detected. Stoichiometric reactions of some disilanes with the slow dehydropolymerization catalyst CpCp*Hf(Cl)Si(SiMe₃)₃ gave metal disilanyl intermediates with selectivities that reflect the observed polymerization behavior.

【 授权许可】

CC BY   
© 2010 by the authors; licensee Molecular Diversity Preservation International, Basel, Switzerland.