Molecular Oxygen as a Redox Catalyst in Intramolecular Photocycloadditions of Coumarins

Pérez Ruiz Raúl

2012

Angewandte Chemie International Edition

Oxygen as a catalyst! While oxygen is usually excluded in nonoxidative photochemical reactions, the photocycloaddition of 3-(alk-4-en-1-yl)-substituted coumarins greatly benefits from the presence of O 2, which was shown to act as a redox catalyst, preferentially in combination with the common antioxidant 3,5-di-tert-butyl-4-hydroxytoluene (BHT). Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.