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DOI: 10.1039/A806870D (Paper) Reference Section for: J. Chem. Soc., Dalton Trans., 1999, 1257-1262

Synthesis and structures of some silylallyl-lithium or -potassium complexes

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Peter B. Hitchcock, Michael F. Lappert, Wing-Por Leung, Dian-Sheng Liu, Thomas C. W. Mak and Zhong-Xia Wang

Abstract

The η3-1,3-bis(silyl)allyllithium [Li{η3-CH(CHSiMe2But)(CHSiMe2R)}(tmen)] (R = But or Me) and 1,3-bis(trimethylsilyl)cyclohexenyllithium [Li{[upper bond 1 start]C(SiMe3)CHC(SiMe3)(CH2)2C[upper bond 1 end]H2}(tmen)] complexes were obtained by lithiation of the appropriate 1,3-bis(silyl)propene or 1,3-bis(trimethylsilyl)cyclohexene. The lithium complexes were transformed into the potassium complexes [K{CH(CHSiMe2But)2}] or [[upper bond 1 start]K{C(SiMe3)CHC(SiMe3)(CH2)2C[upper bond 1 end]H2}] by reaction with KOBut. A dimethylsilyl ansa-bridged bis(cyclohexenyl)dipotassium complex [{K2{(η3-C6H4SiMe3-6)2SiMe2}(thf[hair space])3}∞] was obtained by a similar route. Single crystal structures of three complexes have been determined.

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