Collect. Czech. Chem. Commun. 1980, 45, 127-134

Spectral properties and intramolecular hydrogen bonding in 1-methyl(phenyl)-4(5)-substituted 6-oxo-1H-pyridazin-4(5)-ols

Štefan Kováča and Václav Konečnýb

a Department of Organic Chemistry, Slovak Institute of Technology, 880 37 Bratislava
b Research Institute of Agrochemical Technology, 814 04 Bratislava


Infrared, ultraviolet and 1H-NMR spectral data of 53 1-methyl(phenyl)-4(5)-substituted 6-oxo-1H-pyridazin-4(5)-ols are listed. Intramolecular hydrogen bondings are discussed; relatively strong hydrogen bondings OH...S were found, which are comparable in terms of strength with those of OH...O=C. Wavenumbers of ν(C=O) and ν(O-H) bands linearly correlated with substituent constants σ*, σR and σF.