| Abstract: | The electronic spectra of various, substituted 2-arylbenzothiazoline (1)-2-(benzylideneamino)-thiophenol (II) tautomers were studied in order to determine what species were present in ethanol solution. In every case examined the absorption spectra closely resembled those of the correspondingly substituted 3-methyl-2-arylbenzothiazolines (III) and differed markedly from those of corresponding 2-(benzylideneamino)phenyl methyl sulfides (IV). These results indicate that, under the conditions examined, the 2-arylbenzothiazoline tautomer (I) predominates. Infrared spectra determined or solid samples of series I-II, III and IV were entirely in accord with structure I. |
