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4-hydroxybenzaldehyde : ウィキペディア英語版 | 4-Hydroxybenzaldehyde
|Section2= |Section3= }} 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. == Chemistry == 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.
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