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3-Oxo-2-arylhydrazonals reacted with acrylonitrile to yield hydroxyl tetrahydropyridazine derivatives and with cyclohexenone to yield tetrahydrocinnoline.

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Arylhydrazonals as aldehyde components in Baylis-Hillman reaction: synthesis of 5-hydroxy-2,3,4,5-tetrahydropyridazine-4-carbonitrile and 6,7,8,8a-tetrahydrocinnolin-5(1H)-one