@article { ISI:000230396800004,
	title = {Ti-oxo radicals and product selectivity in olefin oxidations over titanosilicate molecular sieves},
	journal = {Zeitschrift f{\"u}r Physikalische Chemie International Journal of Research in Physical Chemistry and Chemical Physics},
	volume = {219},
	number = {7},
	year = {2005},
	month = {JUL},
	pages = {905-920},
	publisher = {OLDENBOURG VERLAG},
	type = {Article},
	address = {LEKTORAT MINT, POSTFACH 80 13 60, D-81613 MUNICH, GERMANY},
	abstract = {<p>The O-O bond of Ti-oxo species (Ti-peroxo, Ti-hydroperoxo or Ti-superoxo) generated on titanosilicate molecular sieves contacted with H2O2 cleaves either heterolytically or homolytically. While the former type of O-O cleavage (generating non-radical reactive oxygen intermediates) leads to selective epoxide products, the latter (generating reactive oxygen radical intermediates, O-2(-center dot) and HOOcenter dot) results in non-sclective, allylic oxidation products in cyclohexene oxidation. These radicals were detected using EPR spin trapping techniques 5,5-dimethyl-1-pyrroline-N-oxide (DMPO) was used as the spin trap. Radical quenchers like hydroquinone suppressed their concentration and enhanced epoxide selectivity.</p>},
	keywords = {cyclic voltammetry of titanosilicates, EPR-spin trap experiments, Molecular sieves, oxidations, product selectivity, reactive oxygen species, titaniunz-oxo radicals, Titanosilicates},
	issn = {0942-9352},
	doi = {10.1524/zpch.219.7.905.67088},
	author = {Shetti, VN and Srinivas, D and Ratnasamy, P}
}
