Aromatic Benzannulated Germole Dianions. The Dilithio and Disodio Salts of a Germaindenyl Dianion
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- 作者：Seok-Bong Choi ; Philip Boudjouk ; and Kun Qin
- 刊名：Organometallics
- 出版年：2000
- 出版时间：May 1, 2000
- 年：2000
- 卷：19
- 期：9
- 页码：1806 - 1809
- 全文大小：120K
- 年卷期：v.19,no.9(May 1, 2000)
- ISSN：1520-6041
文摘
Conversion of the neutral 1,1-dichloro-DPGI(1) (DPGI = 2,3-diphenyl-1-germaindene) to the lithiumdianion (2a) or sodium dianion (2b) leads to the highlyunusual phenomenon of aromatization of the GeC4portion of 1-germaindene at the expense of the aromaticannulated C6 ring. Treatment of 2a with trimethylchlorosilane gave the 1,1-bis(trimethylsilyl)-DPGI derivative(3) in high yield. The structure of 2a was determined byX-ray crystallography and found to possess two 
5-coordinated lithium ions. The five-membered ring of thegermaindenyl system undergoes significant carbon-carbon bond equalization upon formation of the dianion,while the remaining four carbon atoms become diene-like, exhibiting two short bonds separated by a longbond.
5-coordinated lithium ions. The five-membered ring of thegermaindenyl system undergoes significant carbon-carbon bond equalization upon formation of the dianion,while the remaining four carbon atoms become diene-like, exhibiting two short bonds separated by a longbond.