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Heating of 2,3‐pyridinedicarboxylic acid anhydride (I) with the (hetero)aromatic amines (II) yields the dicarboximides (III).

1-hydroxy-4-oxo-2,5-ciclohadien-1-ethyl acetate has been isolated from leaves and fruits of Jacaranda mimosaefolia D. Don, Bignoniaceae growing in Rio Grande do Sul, Brasil.

Tagetone, limonene, p-cimene and α-pinene have been identified from aerial parts of the whole flowering plants of Tagetes minuta growing in Rio Grande do Sul.