@article { ISI:000239077500019,
	title = {Chemo-, regio- and stereo-selective aerial oxidation of limonene to the endo-1,2-epoxide over Mn(Salen)-sulfonated SBA-15},
	journal = {Applied Catalysis A-General},
	volume = {309},
	number = {1},
	year = {2006},
	month = {JUL},
	pages = {144-154},
	publisher = {ELSEVIER SCIENCE BV},
	type = {Article},
	address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS},
	abstract = {<p>Mn(Salen) complexes immobilized on sulfonic acid-functionalized SBA-15 molecular sieves (SBA-15-pr-SO3-Mn(Salen)) catalyze the Mukaiyama-type oxidation of R-(+)-limonene selectively to the 1,2-epoxide with molecular oxygen at 298 K (Salen = N,N-ethylenebis(salicylidenaminato)). The endo-diastereomer is formed with a diasteromeric excess of 39.8\%. This catalyst exhibited higher catalytic activity than {\textquoteleft}{\textquoteleft}neat{\textquoteright}{\textquoteright} Mn(Salen) complexes directly supported on SBA-15 or zeolite-Y. A change in the oxidation state of Mn from +3 in the {\textquoteleft}{\textquoteleft}neat{\textquoteright}{\textquoteright} complex to +2 when immobilized on the sulfonated surface is a probable cause for the observed enhancement of catalytic activity. A part of the Mn complexes was leached out of the solid phase during the reaction. (c) 2006 Elsevier B.V. All rights reserved.</p>},
	keywords = {aerial oxidation of limonene, catalysis by Mn(Salen) complexes, chemo-, immobilized Mn Schiff base complexes, Mesoporous molecular sieves, Mukaiyama-type oxidation, regio- and stereo-selective epoxidation, sulfonic acid-functionalized SBA-15},
	issn = {0926-860X},
	doi = {10.1016/j.apcata.2006.05.011},
	author = {Saikia, Lakshi and Srinivas, D. and Ratnasamy, Paul}
}
