Irradiation of 3-substituted 2-nitrosoimino-2,3-dihydrobenzothiazoles (I) with a medium pressure mercury lamp gave bis[o-(N-substituted cyanamino)phenyl] disulfides (III) in high yields. Irradiation of 4,5-diphenyl-2-nitrosoimino-2,3-dihydrothiazole (VI) gave bis[(2-phenyl-2-N-phenylcyanamino)vinyl] disulfide (VIII). The photolysis was shown to be due to the π-π* excitation from the results of specific irradiation to π-π* and π-π* bands. The relative rates of photolysis of 2-nitrosoimino-3-phenyl-2,3-dihydrobenzothiazole (Ia) were measured in several solvents. The mechanism has been discussed in connection with that in alkyl nitrites and nitrosamines.
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Akiba et al. (1972) studied this question.
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