Heteropoly acids, their salts and polyoxometalates as heterogenous, efficient and eco-friendly catalysts in organic reactions: Some recent advances

Abstract

In this review article, some recent advances of applying heteropoly acids and polyoxometalates as heterogeneous, reusable and eco-friendly catalysts in organic synthesis are discussed.

Analysis of Interacted Polyvanadate Based on its Preparation and Characterization

“…The proposal of composition of the complex may be given as 6:1:1. The apparent molecular weight of the prepared triheteropoly molybdate complex determined by cryscopic method was found to be Na 4 …”

“…The synthesis is based on condensation process .The thermal stability increases because of occupation of hetero cation into the voids in the centre of vanadate anion [3][4][5] which leads to the formation of oxobridges by eliminations of water molecules. Such condensation reactions generally take place freely and reversibly in acidic medium.…”

Heteropoly acids-catalyzed organic reactions in water: doubly green reactions

“…The catalytic application of HPAs, polyoxometalates (POMs) (12,(14)(15)(16)(17) as efficient homogeneous or heterogeneous solid acids catalysts have been recognized and established both by successful large-scale applications in industry and promising laboratory results (12,(18)(19)(20).…”

Hydration of α-Pinene over Heteropoly Acid H3PW12O40 and H3PMo12O40

“…Generally, reactions catalyzed by HPAs may be represented by the conventional mechanisms of acid Brönsted catalysis. The mechanism may include the protonation of the substrate followed by the conversion of the ionic intermediate to yield the reaction product [19][20][21]. Castanheiro et al [22,23] reported the use of solid acid catalysts such as zeolites and impregnated HPMo on polymeric membranes, and HPMo immobilized in hydrophobically modified PVA membranes.…”