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Asymmetric syntheses of non-functionalized oxiranes can be accomplished with the aid of the new optically active MoVI peroxo complex (1). Thus e. g., propene, 1-butene, and 3-methyl-1-butene were epoxidized to the corresponding R-oxirane in ca. 29, 31, and 16% optical yield (enantiomeric excess). Previously, only activated olefins (styrenes, allyl alcohols, etc.) could be epoxidized asymmetrically.