Bei der durekatalysierten, alkalischen und thermischen Umlagerung 3.3-disubstituierter Pyrazolenine in Pyrazole handelt es sichsoweit die Wanderung desSubstituenten an das C-Atom 4 erfolgt -um cine Sextettumlagerung. Dies folgt aus dem Vergleich der Wanderungsgeschwindigkeit verschiedener Substituenten.Die i m Jahre 1943 von JAN VAN ALP HEN^) beschriebene Pyrazolenin-Pyrazol-Umlagerung
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