Epoxides are essential building blocks in organic chemistry. The epoxidation of unsubstituted cyclic dienes 2, 3, 4 and triene 5 using dimethyldioxirane (1a) and its trifluoro analog 1b methyl(trifluoromethyl)dioxirane has been investigated. The excellent yields obtained (90–98%) are accompanied by outstandingly high diastereoselectivities (90–98%). Interpretation of results based upon the early idea