The zwitterionic intermediate in the 2 + 2 cycloaddition of tetracyanoethylene to ethyl vinyl ether behaves as a 1,4-dipole and can be intercepted by cyclo-additions to heteromultiple bonds producing six-membered heterocycles.
R. Schug and R. Huisgen, J. Chem. Soc., Chem. Commun., 1975, 60 DOI: 10.1039/C39750000060
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