The mechanism of benzophenone-sensitised oxidation of 9-phenylxanthene with oxygen
Abstract
From an investigation of the effect of inhibitors, quenchers, and the failure of a singlet sensitiser to effect the oxidation, it is proposed that the benzophenone-sensitised oxidation of 9-phenylxanthene with oxygen is a type I process. Further support for this conclusion is afforded by spectroscopic considerations. Evidence is also presented that the oxidation is a non-chain process, and the effect of acid on the product distribution is discussed.