[CH2:1]([O:3][C:4]1[N:9]=[C:8]([F:10])[CH:7]=[C:6](F)[N:5]=1)[CH3:2].C(N(CC)CC)C.O.[NH2:20][NH2:21].NN>O.C(#N)C>[CH2:1]([O:3][C:4]1[N:9]=[C:8]([F:10])[CH:7]=[C:6]([NH:20][NH2:21])[N:5]=1)[CH3:2]A mixture of 100 g of 94 percent purity (0.59 mol) 2-ethoxy-4,6-difluoropyrimidine, 275 mL of acetonitrile, and 107 g of water was prepared and cooled to 10° C. To this was added 68 g (0.67 mol) of triethylamine and then 34 g (0.68 mol) of hydrazine hydrate, slowly with stirring and cooling (at 5° to 10° C). When all of the hydrazine had been added, the mixture was stirred another 15 min with cooling and was then allowed to warm. After a total of 1 hour, the solids that formed were recovered by vacuum filtration and were washed twice with 100 mL portions of water and then with 50 mL of ethanol. The title compound, which was obtained as a white solid melting at 141°-143° C., amounted to 79.7 g (80 percent of theory).
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