DINAPHTHAZEPINE SALTS INTENDED FOR USE AS ENANTIOSELECTIVE EPOXY CATALYSTS, PROCESS OF THEIR PREPARATION AND PROCESS OF ENANTIOSELECTIVE EPOXIDATION OF PROCHIRAL OLEFIN

摘要

In the present invention there is disclosed a compound of the general formula Ia or Ib, in which A and B each independently represents hydrogen or one, two or three naphthylidene substituents, which substituents are selected from alkyl containing 1 to 6 carbon atoms, alkoxy containing 1 to 6 carbon atoms, aryl, aryloxy, silyl and silyloxy group; Re1 represents phenyl, alkyl containing 1 to 6 carbon atoms, phenylalkyl containing 1 to 6 carbon atoms in the alkyl moiety or a moiety of the general formula (a): wherein Re2 represents alkyl, containing 1 to 6 carbon atoms, phenyl or benzyl, Re3 represents hydrogen or ORe4 wherein Re4 denotes alkyl containing 1 to 6 carbon atoms or alkylsilyl containing 1 to 6 carbon atoms in the alkyl moiety, n is zero or an integer 1 or 2 and; X represents a counter ion. Further claimed is a process for preparing the above-described compounds as well as their use for enantioselectively epoxidising a prochiral olefin.