Answers are grounded in this paper and cite their sources.
Unlike comenic acid or most other 4‐pyrones, methyl or ethyl comenate reacts with aromatic amines under mild conditions in the sense of ring contraction to 3‐arylamino‐2,4‐dihydroxy‐2‐cyclopentenone‐4‐carboxylates. The structure of the new cyclopentenone derivatives were determined from their characteristic spectroscopic behaviour and was confirmed by X‐ray crystallographic studies of compound Vb.
No takes yet. Share an insight, caveat, or question.
JAKOPCIC et al. (1992) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: