Photodimerization Reaction of 1-Hydroxy-2-pyridinethione

Abstract

On irradiation, the title compound (HPT) in various organic solvents saturated with N₂ yielded the dimerized products, 2, 2′-dithiobis[pyridine] and 2, 2′-dithiobis[pyridine] 1, 1′dioxide. The results of triplet-quenching experiments suggest that the reaction proceeds preferentially through the excited singlet state. The mechanism of this dimerization reaction was discussed based on the results of the solvent-viscosity and HPT-concentration effects on the quantum yields for the disappearance of HPT.