New approaches to photocatalytic reaction of low concentrations of arylamines in alcohols

Photocatalytic interactions of a series of arylamines, for example 1,4-phenylenediamine, 1,2-phenylenediamine, 4-aminophenol, and 2-aminophenol, at low concentrations in typical primary alcohols have been investigated in the presence of anatase TiO₂ nanopowder. GC?CMS analysis of the irradiated solutions showed that, except for 1,2-phenylenediamine, 10?mmol/l alcoholic solutions of the arylamines gave predominately the corresponding imines. Irradiation of 2-aminophenol under these conditions, led to oxidation and dimerization to 2-amino-3H-phenoxazin-3-one.