Water → 5-Amino-1-(2-hydroxyethyl)-4-nitrosopyrazole hydrogen sulfate

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To a flask having an inner volume of 25 ml and equipped with a stirring device, a thermometer and a reflux condenser were charged 1.47 g (10.0 mmol) of 3,3-dimethoxy-2-hydroxyiminopropionitrile with a purity of 98.1% by weight synthesized in the same manner as in Example 1, 0.84 g (10.5 mmol) of 2-hydroxyethylhydrazine with a purity of 95% by weight, 0.54 ml of water, 10 ml of methanol and 1.18 g (12.0 mmol) of conc. sulfuric acid, and the mixture was reacted under reflux (66 to 67° C.) for 3 hours. After completion of the reaction, when the reaction mixture was analyzed by high performance liquid chromatography (absolute calibration curve method), it was found that 2.24 g of 5-amino-1-(2-hydroxyethyl)-4-nitrosopyrazole hydrogen sulfate (Reaction yield: 88.2%) had been formed.

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