Application of 37718-11-9, In the next few decades, the world population will flourish. As the population grows rapidly and people all over the world use more and more resources, all industries must consider their environmental impact. 37718-11-9, name is 1H-Pyrazole-4-carboxylic acid belongs to pyrazoles-derivatives compound, it is a common compound, a new synthetic route is introduced below.
Step 6.1. 1 -(tetrahydro-2H-pyran-2-yl)-1 H-pyrazole-4-carboxylic acid To a suspension of 1 /-/-pyrazole-4-carboxylic acid (50 g, 446 mmol) in 500 mL of DMF are added para-toluenesulfonic acid (8.48 g, 44 mmol) and DHP (132 mL, 1561 mmol). The reaction medium turns yellow and then black after stirring at room temperature for 20 hours. The reaction mixture is poured into saturated aqueous NaHC03 solution and extracted with EtOAc. The aqueous phase is acidified to pH 3 by adding 6M hydrochloric acid solution. The precipitate formed is filtered off and washed with water and then dried under vacuum at 50C to give 61.2 g of a white powder (yield: 70%). LCMS (Method D): MH+ = 197.1 , RT = 0.60 min
The synthetic route of 1H-Pyrazole-4-carboxylic acid has been constantly updated, and we look forward to future research findings.