An unusual cyclization reaction in the chemistry of perchloroorganic compounds of silicon and germanium. Synthesis and crystal structure of perchloro(2,2′-biphenylene)diphenyl-silane and -germane

Abstract

The reactions of SiCl 4 and GeCl 4 (or Ph Cl) 3SiCl and (Ph Cl) 3GeCl where Ph Cl denotes Cl 5C 6) with Ph ClMgCl give perchloro(2,2′-biphenylene)diphenyl-silane ( 2) and -germane ( 3), respectively. The structure of both strained compounds have been determined by X-ray crystallography of their benzene solvates. The photobromination of germane 3 with Br 2 results in cleavage of one germanium-biphenylene bond to give the highly crowded bromo(2-(2′-bromooctachlorobiphenyl))bis(pentachlorophenyl)germane ( 4).