The reactions of the mesoionic species (1) with isocyanates yield the acylated mesoionic derivatives, formed via unstable cycloadducts, with thioisocyanates, reacting similarly; the products of reactions between other similar mesoionic systems and isocyanates, previously described as cycloadducts, are also shown to be acylated mesoionic compounds on the basis of their physical data.
M. Hamaguchi and T. Nagai, J. Chem. Soc., Chem. Commun., 1985, 726 DOI: 10.1039/C39850000726
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