Direct Detection of a Transient Oxenium Ion in Water Generated by Laser Flash Photolysis

摘要

Mechanistic studies of aryloxenium ions 1 are limited, although they have often been proposed to explain synthetically useful oxidation reactions of phenols, and the generation of commercially useful polymers. Some isolatable, highly delo-calized 1 have been observed, but they give little understanding of the properties of transient 1. Discrepancies over the regiochem-istry of reactions of purported 1, and the possible involvement of triplet ions still exist. There is a lack of evidence for the involvement of oxenium ions in most of the cases in which they have been invoked.