4, 5-Substituted Pyridazines. VI. Infrared Absorption and Structure of 4-and 5-Carboxy-6-chloro-3-pyridazinol.

Abstract

Infrared and ultraviolet absorption spectra of 4-and 5-carboxy-6-chloro-3-pyridazinol (I and II) and of their esters (IE and IIE) were measured. It was found that (I) exists in a chelated form in its crystalline state and that (II) forms an intermolecular hydrogen bonding. Metal chelate compounds of (I) with nickel, copper, or manganese were reported. The preparation and ultraviolet absorption spectrum of 5-carbamoyl-6-chloro-3-pyridazinol (II_Amide) were described.