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Molecules 2011, 16(9), 8033-8040; doi:10.3390/molecules16098033
Communication

Synthesis and NMR-Study of the 2,3,4,5-Tetraethylsilole Dianion [SiC4Et4]2−•2[Li]+

Department of Nanopolymer Material Engineering, Pai Chai University, 155-40 Baejae-ro (Doma-Dong), Seo-Gu, Daejon 302-735, Korea
Received: 31 August 2011 / Revised: 8 September 2011 / Accepted: 14 September 2011 / Published: 16 September 2011
(This article belongs to the Special Issue Organosilicon Chemistry)
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Abstract

The previously unknown silole dianion [SiC4Et4]2−•2[Li]+ (3) was prepared by the sonication of 1,1-dichloro-2,3,4,5-tetraethyl-1-silacyclopentadiene [Cl2SiC4Et4, 2] with more than four equivalent of lithium in THF. 1H-, 13C-, and 29Si-NMR data of 3 are compared with those of the reported silole dianion [SiC4Ph4]2−. Trapping of 3 with trimethylchlorosilane gave 1,1-bis(trimethylsilyl)-2,3,4,5-tetraethyl-1-silacyclopentadiene [(Me3Si)2SiC4Et4, 4] in high yield. The silole of 2 was synthesized in high yield in three steps by a modified procedure using Cp2ZrCl2 via Cp2ZrC4Et4 and 1,4-dibromo-1,2,3,4-tetraethyl-1,3-butadiene.
Keywords: silole; germole; dianion; group 14 metallole; aromaticity silole; germole; dianion; group 14 metallole; aromaticity
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Hong, J.-H. Synthesis and NMR-Study of the 2,3,4,5-Tetraethylsilole Dianion [SiC4Et4]2−•2[Li]+. Molecules 2011, 16, 8033-8040.

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