Liquid Phase Synthesis of 1,2-Dihydropyridazine-3,6-dione in the Presence of Ionite Catalysts

The catalytic activity of synthetic ion-exchange resins was studied in the reaction between cis-butenedioic acid and hydrazine (aqueous medium; temperature, 95 degrees C; 2-4 h) with the formation of heterocyclic hydrazide-1,2-dihydropyridazine-3,6-dione. It is established that the most effective catalysts are KU-2-8 and KRF-10P cation exchangers. A probable mechanism of the process with the formation of adsorption complexes and the participation of fixed polymer-bound sulfonate ions and counterions of the cation exchanger is proposed on the basis of IR spectroscopic studies.

Automated summary

The catalytic activity of synthetic ion-exchange resins in the reaction between cis-butenedioic acid and hydrazine was studied, with KU-2-8 and KRF-10P cation exchangers identified as the most effective catalysts. A probable mechanism of the process, involving the formation of adsorption complexes and the participation of fixed polymer-bound sulfonate ions and counterions of the cation exchanger, was proposed based on IR spectroscopic studies.