(Z)-4-(4-fluoro-3-trifluoromethyl-phenyl)-2-hydroxy-4-oxo-but-2-enoic acid ethyl ester 、
甲基肼 以
乙醇 为溶剂,
以to give 5-(4-fluoro-3-trifluoromethyl-phenyl)-2-methyl-2H-pyrazole-3-carboxylic acid ethyl ester as colorless crystals and 5-(4-fluoro-3-trifluoromethyl-phenyl)-1-methyl-1H-pyrazole-3-carboxylic acid ethyl ester as colorless crystals的产率得到5-(4-fluoro-3-trifluoromethyl-phenyl)-2-methyl-2H-pyrazole-3-carboxylic acid ethyl ester