Hydrochloric Acid → 3,3-Dimethoxy-2-hydroxyiminopropionitrile

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To a flask having an inner volume of 300 ml and equipped with a stirring device, a thermometer, a condenser and a gas inlet tube were charged 42.83 g (0.5 mol) of 3-methoxyacrylonitrile with a purity of 97% by weight and 125 ml of methanol, and the mixture was cooled to −10° C. under stirring. Then, the reaction solution was maintained to −10 to 0° C., and while feeding nitrosyl chloride generated by reacting 170.5 g (1.0 mol) of 41% by weight aqueous sodium nitrite solution and 320 ml (3.5 mol) of conc. hydrochloric acid (the above-mentioned method (2)) in a separate apparatus to the reaction solution, the resulting mixture was reacted at −10 to 0° C. for 3 hours and at room temperature for 2 hours. After completion of the reaction, the reaction mixture was concentrated under reduced pressure, the concentrate was washed in the order of n-hexane and toluene, dried under reduced pressure at 40° C. to obtain 61.6 g of 3,3-dimethoxy-2-hydroxyiminopropionitrile (Isolation yield: 80.1%) as a pale yellowish solid with a purity of 93.7% by weight (absolute calibration curve method by high performance liquid chromatography).

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