Ethylene Glycol → 4-(2-hydroxypropan-2-yl)benzoic acid

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4-Isopropylbenzoic acid (5.0 g, 30.5 mmol) was dissolved in a solution of potassium hydroxide (4.1 g, 2 mL, 73.1 mmol) in water (125 mL). To the reaction mixture was added a solution of potassium permanganate (9.6 g, 60.9 mmol) in water (125 mL). The combined mixture was allowed to stir at 60° C. for 2 hours. The reaction mixture was cooled to 0° C. and treated with ethylene glycol (100 μL) and cooled to 0° C. The solid were removed by filtration and the filtrate was acidified to pH 1 by addition of 6 N HCl solution. The solid was removed by filtration, and the filtrate was extracted with diethyl ether (3×200 mL). The combined organic extracts were dried over sodium sulfate, filtered and concentrated in vacuo to provide 4-(1-hydroxy-1-methyl-ethyl)benzoic acid (5.1 g, 93%) as a white solid. ESI-MS m/z calc. 180.1. Found 181.2 (M+1)+; Retention time: 0.6 minutes (3 min run). 1H NMR (400 MHz, MeOD) δ 8.00-7.95 (m, 2H), 7.61-7.56 (m, 2H), 2.64 (s, 1H), 1.54 (s, 6H).

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