In:
Zeitschrift für Physikalische Chemie, Walter de Gruyter GmbH, Vol. 219, No. 7 ( 2005-07-01), p. 905-920
Abstract:
The O–O bond of Ti-oxo species (Ti-peroxo, Ti-hydroperoxo or Ti-superoxo) generated on titanosilicate molecular sieves contacted with H 2 O 2 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 −• and HOO • ) results in non-selective, 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.
Type of Medium:
Online Resource
ISSN:
2196-7156
,
0942-9352
DOI:
10.1524/zpch.219.7.905.67088
Language:
English
Publisher:
Walter de Gruyter GmbH
Publication Date:
2005
detail.hit.zdb_id:
201103-7
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