Norbornadiene reacts with diazoesters with formation of 3- or 5-ethoxycarbonylpyrazole (II) and cyclopentadiene(III); this is the first example of a mild cycloreversion of a 1,3-dipolar adduct obtained from a diazoalkane, and metal carbonyl complexes accelerate the 1,3-dipolar addition of the diazoester to the double bond.
R. Paulissen, J. Chem. Soc., Chem. Commun., 1976, 219 DOI: 10.1039/C39760000219
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