Urea → 1-Benzoyl-3-methyl-5-(3-trichloromethyl-1,2,4-thiadiazol-5-yl)biuret

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A glass pressure vessel was charged with 5.5 grams (0.02 mole) 1-methyl-3-(3-trichloromethyl-1,2,4-thiadiazol-5-yl)urea, 3.2 grams (0.02 mole) benzoyl isocyanate and 50 milliliters benzene. A magnetic stirring bar was added and the vessel sealed. The stirred reaction mixture was heated at 145° C. for 1.5 hours and then allowed to cool to room temperature where 4.5 grams of starting urea precipitates. The urea was removed by filtration and the filtrate concentrated in vacuo to leave 3.0 grams of residue. Extraction of the residue with hot cyclohexane, followed by cooling the extract yielded 0.2 grams (11% selectivity) of pure product; m.p. 70° C.

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