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■ Thermal Retrocycloaddition of 1,2,4,3-Trithiagermolanes: A New Method for Generation of Germanethiones

Norihiro Tokitoh, Tsuyoshi Matsumoto, 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

Thermolysis of 5,5-diphenyl-1,2,4,3-trithiagermolanes bearing bulky aromatic substituents on germanium atom resulted in the formation of novel germanium-sulfur double bond compounds, diarylgermanethiones, which were found to undergo ready [2+2] and [2+4] cycloaddition reactions with dimethyl acetylenedicarboxylate and 2,3-dimethyl-1,3-butadiene to give a new class of germanium-containing heterocycles.