[CH2:1]([C:3]1[CH:11]=[CH:10][C:6]([C:7]([OH:9])=[O:8])=[CH:5][CH:4]=1)[CH3:2].S(Cl)(Cl)=O.[CH3:16]O>>[CH2:1]([C:3]1[CH:11]=[CH:10][C:6]([C:7]([O:9][CH3:16])=[O:8])=[CH:5][CH:4]=1)[CH3:2]A mixture of 4-ethylbenzoic acid (5.12 g), thionyl chloride (3.0 ml) and methanol (150 ml) was heated and refluxed. After 3 hours, the mixture was concentrated under reduced pressure to give methyl 4-ethylbenzoate (5.59 g). this product was used in the subsequent step without purification.
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