On 1 ,3,5-Triazines. Part-IV : Synthesis of 3-Aryl-2- Phenylimino-4-0xo-6-Arylimino-1 ,3,5-Thiadiazines and 3,5-Diary1-2-Thio-4-Phenylimino-6-0xo- Flexahydro-1,3,5-Triazines

Department of Chemistry, Nagpur University, Nagpur-440 010 Manuscript received 13 December 1982, accepted 27 October 1983 The synthesis of 3,5-diaryl-2-thin-4-phenylimino-6-oxo-hexahydro-1,3,5-triazines involving interaction of phenyl isocyanodichloride and 1,5-diaryl-2-thiobiurets has been described. These have been formed through an intermediate 3-aryl-2-phenylimino-4- oxo-6-arylimino-1,3,5-thiadiazines. The phenyl isocyanodichloride unexpectedly did not react with S-benzyl derivatives of 2-thiobiurets