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Department of Chemistry, University of North Bengal, Darjeeling-734 013, West Bengal, India E-mail : pizyl2@yahoo.com Fax : 91-353-2699001 Manuscript received 12 October 2011, revised 23 February 2012, accepted 07 June 2012 A green and efficient protocol has been developed for the synthesis of either exclusively a monoxime or exclusively a dioxime from a host of 1,2-dicarbonyl compounds on silica.

Natural Product and Polymer Chemistry Laboratory, Department of Chemistry, University of North Bengal, Darjeeling-734 013, West Bengal, India E-mail : pizyl2@yahoo.com Fax : 91-353-2699001 Manuscript received 14 December 2010, revised 23 February 2012, accepted 14 March 2012 Reaction of 16-DPA (1) with m-chloroperbenzoic acid (MCPBA) on activated silica gives selectively the 5,6- epoxy derivative 2 of 1 with an excellent yield of 91.75% whereas no selectivity was observed in solution phase reaction and a diepoxy (5,6 and 16,17 ) derivative 3 (as an isomeric mixture) is obtained.