268207-85-8Relevant academic research and scientific papers
Aromatic benzannulated germole dianions. The dilithio and disodio salts of a germaindenyl dianion
Choi, Seok-Bong,Boudjouk, Philip,Qin, Kun
, p. 1806 - 1809 (2008/10/08)
Conversion of the neutral 1,1-dichloro-DPGI (1) (DPGI = 2,3-diphenyl-1-germaindene) to the lithium dianion (2a) or sodium dianion (2b) leads to the highly unusual phenomenon of aromatization of the GeC4 portion of 1-germaindene at the expense of the aromatic annulated 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 by X-ray crystallography and found to possess two η5-coordinated lithium ions. The five-membered ring of the germaindenyl 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 long bond.
