期刊
TETRAHEDRON
卷 58, 期 2, 页码 239-243出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0040-4020(01)01144-9
关键词
catalysts; epoxidatiom silicon and compounds; titanium and compounds
Epoxidation of olefins by tert-butyl hydroperoxide (TBHP) was effectively catalyzed by a cubic silicon-titanium mu-oxo-complex, which is obtained from a bulky silanetriol and titanium alkoxides. The stoichiometric reaction of the complex with TBHP in the absence of olefin formed a novel complex as white solid. The comparison of this product with analogous complexes in H-1 and C-13 NMR spectra indicated that the titanium tert-butylperoxo complex; this kind of intermediate is considered to be active for epoxidation in titanium-based catalysts, was first isolated. This titanium peroxo complex reacted with cyclohexene to produce cyclohexene oxide without additional oxidant accompanying the formation of titanium tert-butoxide. All pathways of the catalytic cycle of the epoxidation using titanium catalysts were verified experimentally. (C) 2002 Elsevier Science Ltd. All rights reserved.
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