反应详情

1 g (3.77 mmoles) of 3-bromo-5-(2'-hydroxyethyl)amino-1-methyl-4-nitropyrazole are hydrogenated in a solution of 380 mg (3.77 mmoles) sulfuric acid in 50 ml water for 2 hours according to method (2). 720 mg (75 percent of theory) of 4-amino-5-(2'-hydroxyethyl)amino-1-methylpyrazole hydrosulfate are obtained in the form of colorless crystals with a melting point of 94° to 97° C.