2,4-DIARYL-2,3-DIHYDROBENZOTHIAZEPINES

Article abstract of DOI:10.1007/BF00842834

2,4-Diaryl-2,3-dihydrobenzo<1,4>thiazepines are obtained in a single stage from chalcones and ortho-aminothiophenol in the presence of triethylamine.The nature of the electronic transitions in their UV absorption spectra is discussed with the use of quantum-chemical methods.It was shown that the seven-membered ring does not invert in the range of temperatures between -80 and +140 deg C and is in the boat form.The main initial event in the fragmentation of the molecules of the obtained compounds under electron impact is the formation of benzothiazole-containing radicalions.In an acidic medium 2,4-diphenyl-2,3-dihydrobenzo<1,4>thiazepine is hydrolyzed to 3-(2-aminophenylthio)-1,3-diphenyl-1-propanone, and in its reaction with 2,4-dinitrophenylhydrazine chalcone hydrazone and o-aminothiophenol are formed.