Lacunary Keggin 11-tungstophosphates modified with transition metal supported on carbon as catalysts for the sulfoxidation 2-(methyltio)-benzotiazole

ROMANELLI, G.P.,; BLANCO M.N,; PIZZIO L.,R.

Salamanca, España,

Congreso; IX Europacat Congress; 2009

Transition metal-modified lacunary heteropolycompounds of the general formula [XW11O39M]n-, where X = P or Si and M = first row transition metal, have recently attracted considerable attention. This is because of their thermal and chemical stability, and the range of possibilities for their modification without affecting the Keggin-type primary structure. These metal-modified lacunary heteropolycompounds display many characteristics of metalloporphyrins. The robust nature of the polyoxometalate ligand and their resistance to oxidation are added advantages that allow the use of these species in both polar and nonpolar solvents as homogeneous catalysts. Advantages to be highlighted about using supported transition metal-modified lacunary heteropolycompounds as catalysts are their easiness of recovery and recycling after carrying out liquid-phase reactions, and the easier product isolation, when they are compared to that of the homogeneously catalyzed reactions. The aim of this paper is to study the preparation and characterization of carbon-supported transition metal-modified lacunary heteropolycompounds to be used as catalysts in the sulfoxidation 2-(methyltio)-benzotiazole