The reaction of 6-methyl-2-(2-oxo-2-phenylethylidene)-2, 3-dihydropyrimidin-4 (1 H)-one and of its nitrosation product with hydroxylamine stops at the stage of forming the corresponding oximes. The reaction of 6-methyl-2-(2-oxo-2-phenylethylidene)-2, 3- dihydropyrimidin-4 (1 H)-one with hydrazine yields a mixture of 3-amino-5-phenylpyrazole and 3-methyl-2-pyrazolin-5-one in 71 and 62% yields, respectively. The ketoxime is used ...
