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Acid-Catalyzed Heterocyclization of N-Methallyl Derivatives of Pyrazolone and Pyridazinone.-N-methallyl derivatives of pyrazolone (III) and pyridazinone (cf. (VII) , (X)), which are easily prepared by condensation of methallylhydrazine with ketocarbonyl compounds, smoothly undergo heterocyclization reactions into pyrazolopyridazines (V) or pyridazinooxazolium salts (cf. (VIII), (XI), (XII)), resp. by treatment with carboxylic anhydrides in the presence of HClO4. -(VOSHCHULA, V. N.; VDOVICHENKO, A. N.; KRIVORUCHKO, A. V.; DULENKO, V. I.; Zh. Org. Khim. 32 (1996) 4, 591-595; Inst. fiz.-org. khim. uglekhim. im. Litvinenko Nats. Akad. nauk Ukr., Donetsk 340114, Ukraine; RU)

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