@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}
}
@article {43396,
	title = {Comparative catalytic activity of Mn(Salen) complexes grafted on SBA-15 functionalized with amine, thiol and sulfonic acid groups for selective aerial oxidation of limonene},
	journal = {Microporous and Mesoporous Materials},
	volume = {104},
	year = {2007},
	month = {AUG},
	pages = { 225-235},
	abstract = {SBA-15 molecular sieves were functionalized with propylamine, propylthiol and propylsulfonic acid groups. Mn(Salen)Cl complexes were grafted on these organo-functionalized SBA-15. The support and the type of organo-functional group influenced the electronic structure (oxidation state and redox behavior) and chemo selectivity of the Mn-complexes in the oxidation of limonene. The Mn ions were reduced from +3 to +2, the extent of this reduction on different supports decreasing in the order: SBA- 15-pr-SH > SBA- 15-prSO(3)H > SBA-15-pr-NH2- Mn(Salen)Cl supported on propylthiol-functionalized SBA-15 yielded the 1,2-limonene epoxide with 100\% chemo- and regioselectivity. Higher electron density at the site of Mn ions and the consequent lower redox potential of the Mn-complexes on immobilization are the probable causes for their efficient and selective catalytic activity. Solvents, additives (N-MeIm) and co-reagents (iso-butyraldehyde), which facilitated formation of Mn2+ ions, enhance the catalytic activity. A part of the Mn complexes was leached out of the solid phase during the reaction and the extent of this with different catalysts decreased in the order: SBA-l5-pr-NH2-Mn(Salen)Cl > SBA- 15-pr-SO3H-Mn(Salen)Cl > SBA- 15-pr-SH-Mn(Salen)Cl. (C) 2007 Elsevier Inc. All rights reserved},
	doi = {10.1016/j.micromeso.2007.02.026},
	author = {Salkia, Lakshi and Srinivas, Darbha and Ratnasamy, Paul}
}
@article { ISI:000315069400009,
	title = {Catalytic activity of ZIF-8 in the synthesis of styrene carbonate from CO2 and styrene oxide},
	journal = {Catalysis Communications},
	volume = {32},
	year = {2013},
	month = {FEB},
	pages = {36-40},
	publisher = {ELSEVIER SCIENCE BV},
	address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS},
	abstract = {<p>The catalytic activity of ZIF-8 in the synthesis of styrene carbonate from carbon dioxide and styrene oxide is presented. ZIF-8 crystals displayed catalytic activity even at temperatures as low as 50 degrees C, with styrene carbonate yields as high as similar to 54\% at 100 degrees C. In contrast to many prior-art catalysts, solvents or co-catalysts were not required. Pyridine and ammonia were used as probe molecules to estimate the type and density of acid sites in fresh and reused ZIF-8 catalysts. DRIFT spectroscopy of adsorbed pyridine revealed the presence of both Bronsted (B) and Lewis (L) acid sites. The B-sites have nearly vanished in the case of recycled ZIF-8 catalysts. The simultaneous presence of both the acid sites and the nitrogen basic moieties from the imidazole linker in ZIF-8 promoted the adsorption of the CO2 on the solid surface and its further conversion to the cyclic carbonate. The ZIF-8 catalysts could be recycled and reused without significant loss in catalytic activity. Published by Elsevier B.V.</p>},
	keywords = {CO2 conversion, cyclic carbonates, Styrene carbonate, Zeolitic imidazolate frameworks, ZIF-8},
	issn = {1566-7367},
	doi = {10.1016/j.catcom.2012.12.003},
	author = {Zhu, Minqi and Srinivas, Darbha and Bhogeswararao, Seemala and Ratnasamy, Paul and Carreon, Moises A.}
}
