In Fortführung früherer Untersuchungen werden die Reaktionen der Titelverbindungen (Ia) und (Ib) mit einer Reihe von Verbindungen untersucht und die Strukturen der Produkte anhand ihrer IR‐Spektren abgeleitet.
The reactions of 4‐carboxyhydrazide‐5,6‐diphenyl‐3(2H)‐pyridazinone (I) with aromatic aldehydes, phenyl isothiocyanate, β dicarbonyl compounds, ethyl ethoxymethylenecyanoacetate, ethyl cyanoacetate and acylating agents have been investigated. Oxadiazolines (III) and thiazolidinones (IV) were synthesized from arylidenehydrazides (II) through appropriate routes. The thiosemicarbazide derivative (V) on reaction with malonic acid and acetyl chloride gave VII, and on treatment with monochloroacetic acid and sodium acetate afforded IX. Some reactions with 3‐amino‐4,5‐diphenylpyrazolo [3,4‐b] pyridazine (XIVa) were also reported.
Durch Grignard‐Reaktion wird aus dem Pyridazinon (I) das Aryliden‐pyridazinon (IIa) und durch Aldehyd‐Kondensation werden aus den Pyridazinonen (IV) die zu (II) tautomeren Derivate (IIIb,c) dargestellt.
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