Sources of common compounds: C5H4N2O4

At the same time, in my other blogs, there are other synthetic methods of this type of compound, 1H-Pyrazole-3,5-dicarboxylic acid, and friends who are interested can also refer to it.

Related Products of 3112-31-0, As we all know, there are many different methods for the synthesis of a compound, and people can choose the synthesis method that suits their own laboratory according to the actual situation. 3112-31-0 name is 1H-Pyrazole-3,5-dicarboxylic acid, This compound is widely used in many fields, so it is necessary to find a new synthetic route. The downstream synthesis method of this compound is introduced below.

A solution of pyrazole-3,5-dicarboxylic acid (75 g, 431 mmol) in 11 of anhydrous methanol was treated with anhydrous HCl gas. The HCl addition was continued for 30 min after which, the solution was allowed to cool to room temperature and allowed to stand for 16 h. The solution was then heated at reflux for 3 h then cooled and the solvent removed at reduced pressure. The resulting white solid was treated with 600 ml of saturated NaHCO3 and extracted into CH2 Cl2 (3*500 ml). The pooled extracts were dried (Na2 SO4), filtered and evaporated at reduced pressure. The resulting white solid was recrystallized from methanol with the addition of anhydrous ether to give dimethyl pyrazole-3,5-dicarboxylate (3-1a). 1 H NMR (CDCl3) delta 7.38 (s, 1H); 3.98 (s, 3H); 3.93 (s, 3H).

At the same time, in my other blogs, there are other synthetic methods of this type of compound, 1H-Pyrazole-3,5-dicarboxylic acid, and friends who are interested can also refer to it.

Reference:
Patent; Merck & Co., Inc.; US5821241; (1998); A;,
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics