[CH2:1]([O:4][C:5]1[CH:16]=[CH:15][CH:14]=[CH:13][C:6]=1[C:7]([O:9]CCC)=[O:8])[CH2:2][CH3:3].CC(C)([O-])C.[K+].CCCCCC.C(OCC)(=O)C.Cl>CS(C)=O>[CH2:1]([O:4][C:5]1[CH:16]=[CH:15][CH:14]=[CH:13][C:6]=1[C:7]([OH:9])=[O:8])[CH2:2][CH3:3]To a stirred solution of Propyl 2-propoxy-benzoate (10 g, 240 mmol) in dimethyl sulfoxide (40 mL) was added potassium tert-butoxide (10 g, 890 mmol) in portions. The solution was heated to 70° C. on a water bath for 2 h, and the progress of the reaction was monitored by TLC using a hexane-ethyl acetate (8:2) solvent system. The reaction mass was cooled to 10° C., poured into ice water, and then acidified with 5% dilute hydrochloric acid. The precipitated solid was filtered and washed thoroughly with distilled water, and the crude mass was recrystallized in hexane (50 mL) to yield an off-white solid of 2-Propoxy-benzoic Acid (7.6 g, 80%).
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