| abstract |
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to chiral salen derivatives useful for the preparation of chiral epoxy compounds, salen-metal derivatives thereof, and their uses, and specifically, chiral salen ( N, N -bis) Metal complexes of (3,5-di- tert -butylsalicylidene) -1-acyl-pyrrolidine-3,4-diamine) derivatives are used as catalysts for the asymmetric epoxidation of olefin compounds. Optically pure epoxy compounds can be prepared in high yields and their preparation methods are simple and useful for preparing chiral epoxy compounds.n n n n n n n n n n (Wherein, R is as described in the specification, the hydrogen atom (1) and the hydrogen atom (2) is in the position of a trans to each other, the compound of formula 1 includes all of their enantiomers.) |