Enantioselective epoxidation of olefins with molecular oxygen catalyzed by gold(III): A dual pathway for oxygen transfer

Autor:	Vicente Fornés, Tania Ródenas, Irene Domínguez, Antonio Doménech, Avelino Corma, María J. Sabater, Carlos J. Gómez-García
Rok vydání:	2009
Předmět:	chemistry.chemical_classification Olefin fiber Ketone Enantioselective synthesis chemistry.chemical_element Epoxide Alcohol Photochemistry Electrochemistry Oxygen Catalysis chemistry.chemical_compound chemistry Polymer chemistry Physical and Theoretical Chemistry
Zdroj:	Journal of Catalysis. 265:238-244
ISSN:	0021-9517
DOI:	10.1016/j.jcat.2009.05.007
Popis:	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 18 O 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 α , β -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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::ab38252b7093eb2a72ed82272a541fdc https://doi.org/10.1016/j.jcat.2009.05.007 Zobrazit plný text záznamu Full Text from ScienceDirect