[CH3:1][C:2]1[CH:3]=[C:4]([CH:11]=[C:12]([CH3:14])[CH:13]=1)[CH2:5][CH:6]([OH:10])[C:7](O)=[O:8].S(Cl)([Cl:17])=O>>[CH3:1][C:2]1[CH:3]=[C:4]([CH:11]=[C:12]([CH3:14])[CH:13]=1)[CH2:5][CH:6]([OH:10])[C:7]([Cl:17])=[O:8]3,5-Dimethyl benzyl glycolic acid (5.59 g) was cooled to 0° C. Thionyl chloride (5 ml) was added and the stirred solution was refluxed for 2 h. The solvent was removed in vacuo to afford 3,5-dimethyl benzyl glycolic acid chloride as an oil.
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