Curcumin is a natural dye, which can be obtained by the following reaction between vanillin and acetylacetone. (1) The oxygen-containing functional group in curcumin is demethoxylated.

(1) According to the structure, it contains phenol -OH and C=O, and its name is hydroxyl and carbonyl (keto), so the answer is: hydroxyl and carbonyl (keto);

(2) The isomers of vanillin meet the following requirements: ① they belong to aromatic esters, containing benzene rings and-cooc-; ② There are two kinds of monochloro compounds on benzene ring, and only two kinds of H on benzene ring; ③ It can react with FeCl3 _ 3 solution, containing phenol -OH, that is, except phenol -OH, another substituent is in para position, so the qualified isomers are,

So the answer is:

(3) Synthesis of cinnamaldehyde, using benzaldehyde and acetaldehyde for aldehyde addition reaction to generate an intermediate, and then dehydrating to generate the intermediate, so that the structural formulas of the two raw materials are C6H5CHO and CH3CHO, respectively.

Therefore, the answer is: C6H5CHO；; CH3CHO．

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