Phenolic aldehyde

Phenolic aldehydes are derivatives of phenol. Phenolic aldehydes can be found in wines and cognacs.

Examples :
 * Hydroxybenzaldehydes
 * Protocatechuic aldehyde
 * Vanillin and isovanillin
 * 2,3,4-trihydroxybenzaldehyde can be isolated from Antigonon leptopus.