Ms. Suseelan, SYNTHESIS OF 4-IMINO-1,2,3,4-TETRAHYDRO-1,3,5-TRIAZINE-6-THIOLS, Indian journal of chemistry. Sect. B: organic chemistry, including medical chemistry, 36(11), 1997, pp. 1066-1068
Reaction of dicyandiamide 1 with 4-aryl-thiosemicarbazides 3a-d yields
ylimino-4-imino-1,2,3,4-tetrahydro-1,3,5-triazine- 6-thiols 4a-d pres
umably by the intramolecular cyclisation of the biguanidothiourea deri
vatives formed during the reaction.