Electric Literature of 37718-11-9,Some common heterocyclic compound, 37718-11-9, name is 1H-Pyrazole-4-carboxylic acid, molecular formula is C4H4N2O2, 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 250-mL round-bottom flask was charged with lH-pyrazole-4-carboxylic acid (5.00 g, 44.6 mmol, 1.00 equiv), DCM (50 mL), and thionyl chloride (21.3 g, 179 mmol, 4.00 equiv). The resulting solution was stirred overnight at 40 °C and concentrated under reduced pressure to provide 6.00 g (crude) of lH-pyrazole-4-carbonyl chloride as a white solid.
These compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route 1H-Pyrazole-4-carboxylic acid, its application will become more common.