Hydrochloric Acid → 5-Amino-1-(2-hydroxyethyl)-4-nitrosopyrazole hydrochloride

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

To a flask having an inner volume of 100 ml and equipped with a stirring device, a thermometer and a reflux condenser were charged 8.43 g (55 mmol) of 3,3-dimethoxy-2-hydroxyiminopropionitrile with a purity of 94.0% by weight synthesized in the same manner as in Example 1, 4.01 g (50 mmol) of 2-hydroxyethylhydrazine with a purity of 95% by weight, 50 ml of ethanol and 7.60 g (75 mmol) of conc. hydrochloric acid, and the mixture was reacted under reflux (76 to 79° C.) for one hour. After completion of the reaction, the reaction mixture was concentrated under reduced pressure, 20 ml of toluene and 20 ml of isopropyl alcohol were added to the concentrate, and the mixture was stirred at room temperature for one hour. Then, the solution was filtered and the filtrate was dried at 40° C. under reduced pressure to obtain 6.85 g of 5-amino-1-(2-hydroxyethyl)-4-nitrosopyrazole hydrochloride (Isolation yield: 67.4%) as yellow solid with a purity of 94.8% by weight (absolute calibration curve method by high performance liquid chromatography).

Herkunft & Nachweise