Full details on the reactivity of the title compound as 4π component in inverse‐type Diels–Alder reactions, including kinetic data, are reported. Donor‐substituted alkynes, alkenes, donor‐substituted and unsubstituted cycloalkenes, ketene acetals and aminals, as well as several cyclic enol ethers were used as dienophiles in these investigations. A number of 4‐mono‐ and 4,5‐disubstituted pyridazines can easily be obtained by this method.

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