Acetic Acid → 4-amino-6-(1-cyclopropylethyl)-5-oxo-3-thioxo-tetrahydro-1,2,4-(2H,4H)-triazine

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882 g (4.14 mols) of 4-(cyclopropyl-methyl-methylene)-N-methylrhodanine (as an E/Z mixture) are introduced into a solution of 712 g (17.8 mols) of sodium hydroxide in 4.4 l of water. After the addition of 7 ml of alkylaryl polyglycol ether, the mixture is stirred at 70° C. until complete dissolution occurs (about 16 hours). 438 g (4.14 mols) of thiocarbohydrazide and 115 ml of 1-decanol are then added, the mixture is stirred for one hour at 70° C., and 1525 ml of acetic acid are rapidly added dropwise, causing the reaction product to precipitate. The mixture is stirred at 80° C. for a further 2 hours, allowed to cool to room temperature and the precipitate is filtered off with suction, washed several times with water and also with petroleum ether and dried at 70° C. 725 g (82.6% of theory) of the above compound of melting point 142°-143° C. are obtained.

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