Ethyl 2-ethoxy-3-(4-hydroxy-3-methylphenyl)propanoate → 2-Ethoxy-3-(4-hydroxy-3-methyl-phenyl)-propionic acid

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The title compound was prepared from 2-ethoxy-3-(4-hydroxy-3-methyl-phenyl)-propionic acid ethyl ester (0.85 g, 2.28 mmol) in the same manner as described for 3-(3-benzyl-4-hydroxy-phenyl)-2-ethoxy-propionic acid. The crude product was used in the next step without further purification (0.71 g, 85%). 1H NMR (400 MHz, CDCl3): δ 6.98 (s, 1H), 6.90-6.93 (d, 1H), 6.64-6.66 (d, 1H), 4.03-4.07 (dd, 1H), 3.57-3.65 (m, 1H), 3.41-3.46 (m, 1H), 2.88-3.05 (ddd, 2H), 2.20 (s, 3H), 1.15-1.20 (t, 3H).

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