Base Catalysis by Mono- and Polyoxometalates

摘要: In sharp contrast with acid-, photo-, and oxidation-catalysis by polyoxometalates, base catalysis polyoxometalates has scarcely been investigated. The use of as catalysts have very recently received much attention extensively Numerous mono- polyoxometalate catalyst systems effective for the chemical fixation CO2, cyanosilylation carbonyl compounds, C–C bond forming reactions developed. Mono- are classified into four main groups respect to their structures: (a) monomeric metalates; (b) isopolyoxometalates; (c) heteropolyoxometalates; (d) transition-metal-substituted polyoxometalates. This review article focuses on relationship among molecular structures, basic properties, unique basis (a)–(d). addition, reaction mechanisms including specific activation substrates and/or reagents such abstraction protons, nucleophilic action toward substrates, bifunctional in combination metal comprehensively summarized.