4-Hydroxybenzaldehyde

4-Hydroxybenzaldehyde is one of the three isomers of hydroxybenzaldehyde. It can be found in the orchids Gastrodia elata and Galeola faberi. It is also found in vanilla. 4-Hydroxybenzaldehyde is one of the three isomers of hydroxybenzaldehyde. It can be found in the orchids Gastrodia elata and Galeola faberi. It is also found in vanilla. The Dakin oxidation is an organic redox reaction in which an ortho- or para-hydroxylated phenyl aldehyde (2-hydroxybenzaldehyde or 4-hydroxybenzaldehyde) or ketone reacts with hydrogen peroxide in base to form a benzenediol and a carboxylate. Overall, the carbonyl group is oxidized, and the hydrogen peroxide is reduced. p-Hydroxybenzaldehyde dehydrogenase is an enzyme found in carrots (Daucus carota).