Phenolic acids and aldehydes

Hydroxy-benzoic acids are characterized by the presence of a carboxyl group substituted on a phenol. Examples include p-hydroxybenzoic acid (1.4), gallic acid (1.5), protocathechuic acid (1.6), salicylic acid (1.7) and vanillic acid (1.8). Related are hydroxybenzoic aldehydes, such as vanillin (1.9), which have an aldehyde group in stead of a carboxyl group.

O OH

O OH

O OH

O OH

och3

och3

och3

och3

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