Barium manganate: a versatile oxidant in organic synthesis

This review presents the applications of BaMnO 4 as an efficient oxidizing reagent in oxidation of organic compounds. Using BaMnO 4 , benzylic, aromatic allylic alcohols, propargylic alcohols, and acyloins were converted to their corresponding carbonyl compounds. Also, oxidations of thiazolines and oxazolines to prepare aromatic thiazol and oxazole heterocycles were performed. Using this oxidant, alcohols were successfully oxidized and participated in tandem oxidation–Wittig reaction with halides. This reagent was also used to oxidative cyc1ization of benzylideneamino anilines, phenols and thiophenols for the synthesis of benzimidazoles, benzoxazoles and benzthiazoles. The oxidative coupling of thiols, 1,4-dihydropyridin derivatives and conversion of thiazolidines to thiazolines and the preparation of symmetrical disulfides were proceeded by this oxidative reagent. Using BaMnO 4 in oxidation of organic compounds is more advantageous with respect to traditional manganese based oxidants, more notably with MnO 2 . Graphical abstract