Patent ID: 8507716

Claim:
A process for preparing 4-(4-carbomethoxyphenyl)butanal, comprising the following steps: (a) condensing methyl p-bromobenzoate with 3-buten- 1-ol to give a reaction mixture containing 4-(4-carbomethoxyphenyl)butanal; (b) extracting the reaction mixture with an organic solvent to obtain an organic extract; (c) decolorizing the organic extract with silica gel, then removing the organic solvent to give 4-(4-carbomethoxyphenyl) butanal, wherein the organic solvent is selected from: (i) one or more of C5-C8 alkane, petroleum ether, and C2-C4 ether; (ii) a solvent mixture of the solvent in (i) and ethyl acetate; or (iii) ethyl acetate, and wherein the C5-C8 alkane is selected from n-hexane or cyclohexane, and C2-C4 ether is selected from isopropyl ether.