ChemInform Abstract: Diels‐Alder versus Heterodiene in the Reaction Between 4‐Arylidene‐5‐pyrazolones and 2,3‐Dimethylbutadiene: The Effect of Acid Catalysis.

Abstract The reactions of the (E)‐pyrazolones (I) and the (Z)‐pyrazolones (II) with the diene (III) in benzene are investigated.