Application of 187998-35-2, These common heterocyclic compound, 187998-35-2, name is 1-(4-Chlorophenyl)-5-methyl-1H-pyrazole-4-carboxylic acid, its traditional synthetic route has been very mature, but the traditional synthetic route has various shortcomings, such as complicated route, low yield, poor purity, etc, below Introduce a new synthetic route.
A solution of l-(4-chloro-phenyl)-5-methyl-lH-pyrazole-4-carboxylic acid (1.5 g, 6.3 mmol) in thionyl chloride (18 rnL) is warmed to reflux for 1 hour. After cooling to room temperature, the reaction mixture is concentrated in vacuo to afford l-(4-chloro-phenyl)- 5-methyl-lH-pyrazole-4-carbonyl chloride as a tan solid (1.6 g, 100 %) which is used without further purification.
The synthetic route of 187998-35-2 has been constantly updated, and we look forward to future research findings.