Journal
JOURNAL OF CATALYSIS
Volume 265, Issue 2, Pages 238-244Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2009.05.007
Keywords
Gold; Epoxidation; Asymmetric catalysis; Enantioselectivity
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Funding
- Direccion General de Investigacion Cientifica y Tecnica of Spain [MAT2006-14274-CO2-01]
- Generalidad Valenciana [GV04B-270, 008/130]
- Consejo Superior de Investigaciones Cientificas
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A chiral gold(III) complex has been prepared that performs the epoxidation of olefins in the presence of O-2, PhIO, or bleach. Catalytic experiments with O-18 show that O-2 is activated on the catalyst and can be directly incorporated into the epoxide through a non-radical mechanism that probably involves formation of gold, oxo, or peroxo species. In addition to this, there is a parallel radical mechanism operating that yields alpha, beta-unsaturated ketones and alcohols as subproducts. Electrochemical and UV-Vis experiments confirmed the occurrence of a Au(III)/Au(I) redox cycle during the catalytic epoxidation in a mechanism sustained by molecular oxygen. (C) 2009 Elsevier Inc. All rights reserved.
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