synthesis and nmr-study of the 2,3,4,5-tetraethylsilole dianion [sic4et4]2？？2[li]+合成和nmr-study的2、3、4,5-tetraethylsilole二阶阴离子(sic4et4)2 2(李)+.pdf

Molecules 2011, 16, 8033-8040; doi:10.3390/molecule OPEN ACCESS molecules ISSN 1420-3049 /journal/molecules Communication Synthesis and NMR-Study of the 2,3,4,5-Tetraethylsilole Dianion [SiC Et ]2−•2[Li]+ 4 4 Jang-Hwan Hong Department of Nanopolymer Material Engineering, Pai Chai University, 155-40 Baejae-ro (Doma-Dong), Seo-Gu, Daejon 302-735, Korea; E-Mail: jhong@pcu.ac.kr; Tel.: +82-42-520-5755; Fax: +82-42-520-5798 Received: 31 August 2011; in revised form: 8 September 2011 / Accepted: 14 September 2011 / Published: 16 September 2011 2− + Abstract: The previously unknown silole dianion [SiC Et ] •2[Li] (3) was prepared by 4 4 the sonication of 1,1-dichloro-2,3,4,5-tetraethyl-1-silacyclopentadiene [Cl SiC Et , 2] with 2 4 4 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 [SiC Ph ]2−. Trapping of 3 with 4 4 trimethylchlorosilane gave 1,1-bis(trimethylsilyl)-2,3,4,5-tetraethyl-1-silacyclopentadiene [(Me Si) SiC Et , 4] in high yield. The silole of 2 was synthesized in high yield in thre