Die Pyrazolo-cumarine 111 sowie deren Hydrazone wurden aus 3-Acetyl-4-hydroxy-cumarin (I) und dem entsprechenden Hydrazin erhalten. Bei der Behandlung von 3-Acetyl-cumarin rnit Hydrazin tritt Entacylierung unter Bildung von Salicylaldazin ein. -Die Einwirkung von Hydrazin auf o-Acetokhellinon (VI a) bzw. auf o-Aceto-visnaginon (VI b) fiihrt zu 4.7-Dirnethoxy-5-[3(oder 5)-methyM(oder 3)-pyrazolyll-cumaron (VII a) bzw. zu der entsprechenden 4-Methoxy-6-hydroxy-Verbindung VII b. -Die Pyrazolin-Derivate XIV (bzw. Isomere) werden leicht durch Einwirkung der entsprechenden Hydrazine auf Styryl-Derivate von I erhalten.
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