Severa 1 aryl thi osemi ca rbazi des were synthes i zed by condens i ng p-(diphenylphosphino)benzoic acid hydrazide and diphenylphosphinoacetic acid hydrazide with suitable aryl isothiocyanates. Cyclisation of these thiosemicarbazides with 2N sodium hydroxide afforded 5-substituted phosphino-4-aryl -3-mercapto-s-triazoles. When cyclisation was affected by concentrated sulphuric acid, 2-arylamino-5-substituted phosphino-l,2,4-thiazoles were obtained.
M A HASSAN ,M EL DEEK ,A I H HASHEM ,S EL HAMSHARY ,
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