Convenient Unimolecular Sources of Aryloxyl Radicals. 1. Aryloxyoxalyl Chlorides

摘要

UV photolysis of readily synthesized aryloxyoxalyl chloride half-esters provides a new unimolecular source of aryloxyl radicals, as shown by ESR nd UV-vis spectroscopy. Although phenoxyl radicals have been generated and investigated for a long time, such studies have usually been carried out under solution phase bimolecular oxidative conditions, or by direct photolysis of phenols. We have recently had the occasion to desire a method for efficient unimolecular photochemical generation of phenoxyl and related aryloxyl radicals, and have found that aryloxyoxalyl chloride half-esters provide a readily available photochemical source of aryloxyl radicals. Synthesis (chemistry). (jes)