Meijere, Armin de and König, Burkhard
Diels-Alder Reactions of [2.2]Paracyclophane-1-ene and [2.2]Paracyclophane-1,9-diene with 3,6-Disubstituted 1,2,4,5-Tetrazines.
Helvetica Chimica Acta 75 (3), pp. 901-906.
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[2.2] Paracyclophan-1-ene (1) and [2.2] paracyclophane-1,9-diene (6) apparently act as dienophiles with inverse electron demand and smoothly react with dimethyl 1,2,4,5-tetrazine-3,6-dicarboxylate (2a) at room temperature forming dihydropyridazine adducts, which are dehydrogenated to the pyridazino-anellated [2.2] paracyclophanes 5a and 8a, respectively. The molecular structure of 5a is ...
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