Selective oxidation of sulfides to sulfóxides or sulfones using Keggin heteropolyacid as catalyst

P. TUNDO, G. ROMANELLI, P. DIMITROFF, P. VÁZQUEZ

Dresden, Alemania

Conferencia; 1st International IUPAC Conference on Green Chemistry; 2006

IUPAC

The objective of this work was studied the influence of H5PMo11Al0.5V0.5O40 (HPA), with Keggin structure, as catalyst in selective oxidation of sulfides to sulfoxides or sulfones, with H2O2. High conversion and excellent selectivity was obtained to sulfoxides or sulfones, using the reaction conditions, the amount of catalyst used was 1 % (mmol) in relation to initial reactive. The better reaction conditions for selective oxidation of methyl phenyl sulfide to the sulfoxide, with H2O2 were: room temperature, ratio of 1:28 of molar sustrate to H2O2, acetonitrile as solvent and 1 % HPA (in mmol) as catalyst. 100 % of conversion by reactive, for 1 h of reaction time, with 99 % of selectivity to sulfoxides were obtained for previously described reaction conditions. In addition, the better reaction conditions for selective oxidation of methyl phenyl sulfide to sulfone (100 % selectivity and conversion, respectively) was obtained for 2 h of reaction time. The V presence on Keggin structure is very important to obtain both products. In order to establish general applicability of experimental conditions various functionalized sulfides were subjected to the oxidation protocol.