Isocyanates were reacted with aromatic carboxylic acids and arylacetic acid derivatives to form a mixed carbamic acid anhydride. Addition of trifluoromethanesulfonic acid leads to a proposed diprotonated intermediate, which undergoes an intramolecular electrophilic reaction with the appended aromatic ring to form a cyclic imide product.

Acid-promoted synthesis of cyclic imides from carboxylic acids and isocyanates

2019 Spring National Meeting

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