Hydrogen-peroxide epoxide ation of natural olefins catalyzd by a dinuclear manganese complex

摘要

The complex of Mn(IV) with the macrocyclic N-containing ligand 1,4,7-trimethyl-1,4,7-triazacyclononane (L) [L_2Mn_2O_3](PF_6)_2 catlayzes epxidation of (+)-limonene in CH_3CN solution at room temperature.Adding CH_3COOH accelerates the reaction.The products are isomers of limonene epoxide with predominance of that with an epoxified ring double bond.Epoxidation of alpha-and beta-pinene by this systemis less effective,apparently due to extensive steric shielding of the double bonds in the pinenes.