Abstract
The effect of substituents in the pyridazone ring (including the carbonyl oxygen atom) on the chlorine atoms in the 3,4, or 5 positions was investigated on the basis of data from the Cl35 nuclear quadrupole resonance (NQR) spectra of chloro-substituted 6-pyridazones. The NQR frequencies of 1-phenyl-4,5-dichloro-6-pyridazone were compared with the reactivities of chlorine atoms in this compound in nucleophilic substitution reactions.
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