Journal
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
Volume 249, Issue 1-2, Pages 123-128Publisher
ELSEVIER
DOI: 10.1016/j.molcata.2005.12.043
Keywords
molybdenum(VI) trioxide; catalysis; epoxidation; heterocyclic aromatic amines; ligand acceleration
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Efforts were made at developing a simple catalytic epoxidation system for olefins using MoO3 and TBHP as terminal oxidant. Conversions of up to 92% and epoxide selectivities of up to >= 99% were obtained. The epoxidation reaction was accelerated by the addition of catalytic quantities of pyridine and pyrazole. The highest conversion was obtained with styrene (92%) and the highest selectivity with beta-methylstyrene (>= 99%). For the epoxidation of cyclohexene a number of decomposition products were obtained including a large proportion of 1-(tert-butylperoxy)-2-cyclohexene. Preliminary investigations appear to indicate the presence of peroxo Mo(VI) complexes in the epoxidation reaction mixture. (c) 2006 Elsevier B.V. All rights reserved.
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