Molecular Oxygen as a Redox Catalyst in Intramolecular Photocycloadditions of Coumarins
作者:Darius Paul Kranz、Axel Georg Griesbeck、Ronald Alle、Raul Perez-Ruiz、Jörg Martin Neudörfl、Klaus Meerholz、Hans-Günther Schmalz
DOI:10.1002/anie.201201222
日期:2012.6.11
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 O2, which was shown to act as a redoxcatalyst, preferentially in combination with the common antioxidant 3,5‐di‐tert‐butyl‐4‐hydroxytoluene (BHT).