Asymmetric Epoxidation with Optically Active (Salen)manganese(III) Complexes: From Which Direction Does the Olefin Approach the Metal-Oxo Bond? - Hosoya, Naoki; Hatayama, Akira; Yanai, Koichi; Fujii, Hiroyuki; Irie, Ryo; Katsuki, Tsutomu (Synlett, 1993)