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SN-EXCHANGED HYDROTALCITES AS CATALYSTS FOR CLEAN AND SELECTIVE BAEYER-VILLIGER OXIDATION OF KETONES USING HYDROGEN PEROXIDE
Citation:
Pillai**, U R. AND E SahleDemessie*. SN-EXCHANGED HYDROTALCITES AS CATALYSTS FOR CLEAN AND SELECTIVE BAEYER-VILLIGER OXIDATION OF KETONES USING HYDROGEN PEROXIDE. Derouane, E.G. (ed.), JOURNAL OF MOLECULAR CATALYSIS A: CHEMICAL. Elsevier Science BV, Amsterdam, Netherlands, 191(1):93-100, (2003).
Description:
A Sn-doped hydrotalcite (Sn/HT) catalyst prepared by ion-exchange is found to be an active and selective catalyst for the liquid phase Baeyer-Villiger (BV) oxidation of cyclic ketones in acetonitrile using hydrogen peroxide (H2O2) as oxidant. Different reaction perameters such as effect of solvent, Sn content, reaction parameters such as effect of solvent, Sn content, reaction temperature and catalyst-to-substrate ratio are studied. The activity of the catalyst for the selective BV oxidation of ketones is attributed to the presence of active Sn sites in the interstitial position of hydrotalcite support. Sn sites activate the carbonyl group of ketones followed by a nucleophilic attack by the active peroxide species (peroxycarboximidic acid by reaction of acetonitrile and H2O2) to form a Criegee adduct rearranges to give the lactone.