Researchers who often do experiments know that organic synthesis is a process of preparing more complex target molecules from simple raw materials through one or more chemical reactions. Generally, it requires fewer steps, and cheap raw materials. 288-13-1, name is 1H-Pyrazole, A new synthetic method of this compound is introduced below., 288-13-1
4-nitro-1H-pyrazole Pyrazole (10 g, 147 mmol), was added to concentrated sulfuric acid (100 mL), in portions, while maintaining the internal reaction temperature below 50 C. via an ice water bath. Concentrated nitric acid (10 mL) was then added, dropwise, maintaining the internal reaction temperature below 50 C. via an ice water bath. The ice water bath was removed and the reaction was heated to 60 C. and stirred for 4 hours. The reaction was cooled via an ice water bath and made basic, to ?pH 8, with 18 N aqueous NaOH solution (150 mL). The product, which precipitated as a white solid, was collected by filtration, washed with H2O, and dried under high vacuum to afford 4-nitro-1H-pyrazole (7 g, 42%) as a white solid. 13C NMR (100 MHz, CDCl3): delta 126.4, 137.0.
The basis of chemical reaction formula synthesis, the synthesis route is composed of some specific reactions and combined according to certain logical thinking. We look forward to the emergence of more reaction modes in the future.