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Spectral properties and intramolecular hydrogen-bonds of 2,4-disubstituted and 2,5-disubstituted 3-oxo-2H-pyridazine-5-thiols and 3-oxo-2H-pyridazine-4-thiols

Š. Kováč, V. Konečný, and V. Knoppová

Department of Organic Chemistry, Slovak Technical University, CS-81237 Bratislava

 

Abstract: Infrared, ultraviolet spectral data and pKa values of sixteen 2,4-disubstituted 3-oxo-2H-pyridazine-5-thiols and 2,5-disubstituted 3-oxo-2H-pyridazine-4-thiols are reported. Intramolecular hydrogen bonds of these compounds are discussed; relatively strong intramolecular S—H...О and S—H...S hydrogen bonds were found which are due to theringsize and the presence of the C = 0 group of the pyridazine ring.

Full paper in Portable Document Format: 421a73.pdf

 

Chemical Papers 42 (1) 73–80 (1988)

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