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

S. A. Dzhumadullaeva, А. Bayeshov

2021

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DOI 10.1134/s0036024421050101
Data confidence 70 medium
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Abstract

The catalytic activity of synthetic ion-exchange resins was studied in the reaction between cis-butenedioic acid and hydrazine (aqueous medium; temperature, 95°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.