1,3,5,2-thiadiazaphosphorin-2-thione prepn

摘要

of formula (I): where X is NR1R2, R1 and R2 are opt. substd. aryl, aralkyl or aliphatic groups, or NR1R2 is a heterocyclic ring, and R3 is opt. substd. aryl, aralkyl or aliphatic group, or is arylthio or alkylthio. (I) are plastics additives or intermediates for plant protection agents. 1 mole ethyl-perthiophosphonic acid anhydride and >=4 moles diethylcyanamide were mixed to give a strong exothermic reaction. Reaction mixt. was then heated to 100-130 degrees C, and then cooled, suction filtered, and recryst. from benzene to give 2-ethyl-3,5-bis(diethylamino)-1,3,5,2-thiadiazaphosphorine-2-thio- ne, m.p. 121-123 degrees C. Yield was 64% of theory.