Synthesis and structure of zwitterionic silylborates and silylzincates with pendant polydonor arms

Hui Li, Fernando Hung-Low, Clemens Krempner

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Abstract

The synthesis and structure of well-defined zinc- and potassium-containing heterobimetallic zwitterions that have pendant polydonor arms is reported. The zwitterionic complexes [Me 2ZnSi(SiMe 2OCH 2CH 2OMe) 3Li] (Li-2), [Cl 2ZnSi(SiMe 2OCH 2CH 2OMe) 3K] (K-3), and [I 2ZnSi(SiMe 2OCH 2CH 2OMe) 3K] (K-4) were prepared from reactions of [Si(SiMe 2OCH 2CH 2OMe) 3M] (M = Li, K) (M-1) with ZnCl 2, ZnI 2, and ZnMe 2, respectively. Reaction of K-1 with B(C 6F 5) 3 gave the potassium silyl borate [(C 6F 5) 3BSi(SiMe 2OCH 2CH 2OMe) 3K] (K-5) in 90% yield. Treatment of 2 equiv of K-1 with ZnCl 2 afforded the nonzwitterionic zinc silanide Zn(Si(SiMe 2OCH 2CH 2OMe) 3) 2 (6), as a liquid, which upon treatment with 1 equiv of ZnMe 2 and 4 equiv of B(C 6F 5) 3 could be converted into the zwitterionic zinc silyl borate [(C 6F 5) 3BSi(SiMe 2OCH 2CH 2OMe) 3Zn][MeB(C 6F 5) 3] (7). The structures of the zwitterionic complexes K-4, K-5, and 7 were determined by X-ray crystallography.

Original languageEnglish
Pages (from-to)7117-7124
Number of pages8
JournalOrganometallics
Volume31
Issue number20
DOIs
StatePublished - Oct 22 2012

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