摘要:
3-Thia-7,7-dimethyl-7-germabicyclo[3.3.0]oct-1(5)-ene and its selenium analog, prepared by cycloaddition of a germylene to 3,4-bis(methylene)thiolane and selenolane, respectively, react with 2,3-dichloro-5,6-dicyanoquinone to give the corresponding substituted thiophene and selenophene Oxidation of the sulfur compound with metachloroperbenzoic acid leads to the germabicyclic sulfone, a precursor of 3,4-bis(methylene)germacyclopentane.