The reaction of a mesoionic 1,3-dithiolium-4-olate with phenyl isocyanate is not a 1,3-dipolar cycloaddition as the primary cycloadduct is an azetidinedione which probably results from the addition of phenyl isocyanate with the opened ketene form of the mesoionic compound.
M. Bssaibis, A. Roberf and A. Souizi, J. Chem. Soc., Chem. Commun., 1993, 998 DOI: 10.1039/C39930000998
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