Sodium Bicarbonate → 5-(4-Fluorophenoxy)isophthalic acid

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A mixture of dimethyl 5-(4-fluorophenoxy)isophthalate (3.8 g, 12.49 mmol) and sodium bicarbonate (1.2 g, 14.28 mmol) in MeOH (100 mL) and water (15 mL) was heated at 80° C. overnight. An additional 500 mg of sodium bicarbonate was added to the reaction mixture and continued to heat at 100° C. for 6 h. HPLC showed a mixture of monoacid (major), diacid (minor) and a small amount of starting material. Prep HPLC provided diacid, 5-(4-fluorophenoxy)isophthalic acid (0.4 g, 1.448 mmol, 11.60% yield) and monoacid, 3-(4-fluorophenoxy)-5-(methoxycarbonyl)benzoic acid (2.2 g, 7.58 mmol, 60.7% yield) as a white solid.

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