[CH3:1][O:2][C:3]1[CH:8]=[C:7]([O:9][CH3:10])[CH:6]=[C:5]([O:11][CH3:12])[CH:4]=1.CO/[CH:15]=[CH:16]/[C:17]([O:19][CH3:20])=[O:18].P(Cl)(Cl)(Cl)=O>O.C(O)(=O)C>[CH3:12][O:11][C:5]1[CH:4]=[C:3]([O:2][CH3:1])[CH:8]=[C:7]([O:9][CH3:10])[C:6]=1/[CH:15]=[CH:16]/[C:17]([O:19][CH3:20])=[O:18]1.68 g of 1,3,5-trimethoxybenzene, 2.32 g of methyl trans-3-methoxyacrylate, 0.18 g of water and 6 mL of glacial acetic acid were mixed, 164 mg of phosphorus oxychloride was added into the mixture at an inner temperature of 25° C., the added mixture was stirred for 3 hours at the same temperature to cause a reaction. After completion of the reaction, 36 mL of water was added dropwise into the reaction liquid, and the precipitated crystals were filtrated. The crystals were washed with 20 vol % of aqueous methanol, then, dried to obtain 2.28 g of methyl trans-3-(2,4,6-trimethoxyphenyl)acrylate (white solid). Yield: 91%.
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