Prof. Dr. Henri B. Kagan, Dr. Hubert Mimoun, Dipl.-Chem. Christoph Mark and Prof. Dr. Volker Schurig
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.