Trifluoroacetic acid → 7-Phenylhept-2-enoic acid

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Reaction Steps

t-butyl 7-phenylhept-2-enoate (19 g; 70 mmol) is dissolved in dry CH2Cl2 (120 mL) and trifluoroacetic acid (25 mL) is added slowly. After 5 hours the reaction is concentrated in vacuo and purified by column chromatography using CH2Cl2 to obtain 7-phenylhept-2-enoic acid (7 g; 34 mmol). 1H NMR (300 MHz, CDCl3) δ 12-10 (br, 1H), 7.30-7.24 (m, 2H), 7.20-7.12 (m, 3H), 7.06 (dd, J=15.7, 7 Hz, 1H), 5.80 (d, J=15.7 Hz, 1H), 2.62 (t, J=7.5 HZ, 2H), 2.25 (q, J=7 HZ, 2H), 1.70-1.61 (m, 2H), 1.56-1.46 (m, 2H).

Provenance & Evidence