The synthesis and some reactions of six new pyridazine derivatives, namely: 6‐(3,4‐, 2,4‐ and 2,5‐dimethylphenyl)‐3‐chloropyridazines and 6‐(3,4‐ 2,4‐, and 2,5‐dimethylphenyl)‐4‐methyl‐3‐chloropyridazines are described. Their i.r. and u.v. spectra are given. Theoretical calculations for these new pyridazine derivatives, based on the simple HMO‐method are performed. Very good agreement between the theoretically predicted reactivities and the experimental findings is obtained.
Die Methylpyridazinone (II) ‐ erhalten durch Methylierung von (I) ‐ bzw. ihre Analogen (IV) werden mit POCl3 in die Pyridazinchloride (III) bzw. (V) übergeführt.
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