The reaction of dimethyldioxirane with several alkynes gives products
which are conveniently rationalized by postulating the intermediacy of
oxirenes and oxocarbenes. The latter serve as precursors to H atom or
methyl group migration products, as well as to cyclopropane insertion
products in some cases. Alkenes, derived from some of these carbene r
eactions, are partially converted to epoxides.