Coniferyl aldehyde is an organic compound with the formula HO(CH3O)C6H3CH=CHCHO. It is a derivative of cinnamaldehyde, featuring 4-hydroxy and 3-methoxy substituents. It is a major precursor to lignin. Biosynthetic role In sweetgum (Liquidambar styraciflua), coniferyl aldehyde is a precursor to sinapaldehyde via hydroxylation mediated by coniferyl aldehyde 5-hydroxylase. Coniferyl aldehyde is reduced to coniferyl alcohol by the action of dehydrogenase enzymes. It is found in Senra incana (Hibisceae). It is a low molecular weight phenol that is susceptible to extraction from cork stoppers into wine. See also Phenolic compounds in wine References O-methylated phenylpropanoids Conjugated aldehydes Vinylogous carboxylic acids