N-Substituted phthalamic, maleamic, and succinamic acids cyclise to isoimidium (iminolactonium) perchlorates on treatment with acetic anhydride–perchloric acid, and with bases give isoimides, imides, or derivatives of amic acids.
G. V. Boyd, J. Chem. Soc. D, 1969, 1147 DOI: 10.1039/C29690001147
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