Phototransformation of 2-Chloroaniline in Aqueous Solution.

The article discusses the study regarding the phototransformation of 2-chloroaniline in aqueous solution, in France. The study is aimed to analyze the main photoproducts formed in aqueous solution, and to compare them with the photochemical behaviors previously published. An evaluation of the pKa from the protonated form of 2-chloroaniline was made at 2.6 from the variation of UV spectrum with pH. It was observed that after irradiation of 1 minute, in which after about 22 percent conversion, the solution was brownish, but only one main product could be observed on the HPLC chromatogram. Therefore, it was concluded that 2-chloroaniline behaves as a 2-chlorophenolate that leads to a photocontraction of the ring, in aqueous solution.