MUMBAI, India, Oct. 26 -- Intellectual Property India has published a patent application (202621107231 A) filed by Inventys Research Co Pvt Ltd on September 07, 2026, for A Process For The Preparation Of Acid Addition Salts Of 3,4-Dimethylpyrazole.
Inventor includes Dr. Deepak Birewar.
The application for the patent was published on October 23, 2026, under issue no. 43/2026.
Abstract: ABSTRACT TITLE: A PROCESS FOR THE PREPARATION OF ACID ADDITION SALTS OF 3,4-DIMETHYLPYRAZOLE A process for preparing acid addition salts of 3,4-dimethylpyrazole (DMP) is disclosed, comprising dissolving DMP in an organic solvent, adding an acid selected from p-toluenesulfonic acid, oxalic acid, glycolic acid, sulfuric acid, or phosphoric acid at a molar ratio of about 1:1.05, maintaining the mixture at a controlled temperature, cooling to effect crystallization, and isolating the acid addition salt by filtration and drying. Aromatic hydrocarbon solvents (chlorobenzene, toluene, xylene) are found to give a consistent, quantifiable yield advantage of approximately 2.1 percentage points over polar solvents, across all five acids tested, spanning mineral, sulfonic, and carboxylic acid classes of substantially different pKa. The process affords each acid addition salt in a yield of at least 90% and a purity of at least 98.5%, using conditions suited to industrial- scale operation.
Disclaimer: Curated by HT Syndication.
