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■ A Novel Reaction of an Overcrowded Germylene with Isothiocyanate Leading to the Formation of 4-Imino-1,3,2-dithiagermetane Ring System

Norihiro Tokitoh,* Kuniyuki Kishikawa, Kyoko Manmaru, and Renji Okazaki*

*Department of Chemistry, Graduate School of Science, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8567, Japan

Abstract

A diarylgermylene [Tbt(Tip)Ge:] kinetically stabilized by 2,4,6-tris-[bis(trimethylsilyl)methyl]phenyl (Tbt) and 2,4,6-triisopropylphenyl (Tip) groups was allowed to react with phenyl isothiocyanate to afford a germanium-containing four-membered heterocycle, 4-imino-1,3,2-dithiagermetane derivative via [2+2]cycloaddition reaction of initially formed diarylgermanethione [Tbt(Tip)Ge=S], the intermediacy of which was evidenced by electronic spetroscopy.