3-Chlorobenzoic Acid → (1,1'-Biphenyl)-3-carboxylic acid

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Using 0.1 mol % Pd and microwave irradiation. The general procedure described in Example 3 was used with 3-chlorobenzoic acid (157 mg, 1.00 mmol), phenylboronic acid (145 mg, 1.20 mmol), K2CO3 (345 mg, 2.50 mmol), water (1.5 mL), Pd/L solution (0.200 mL of a Pd(OAc)2 (1.1 mg, 0.005 mmol, 0.5 mol %), sodium 2-dicyclohexylphosphino-2′,6′-dimethoxybiphenyl-3′-sulfonate (5.0 mg, 0.010 mmol, 1 mol %) solution in 1.0 mL water), 10 min, 150° C. (microwave irradiation with cooling). The product was isolated as a white solid (192 mg, 97%). Mp=164° C. (lit.=165-166° C.) 1H NMR (400 MHz, CDCl3) δ: 11.90 (br-s, 1H), 8.41 (s, 1H), 8.15 (d, 1H, J=7.6 Hz), 7.88 (d, 1H, J=7.6 Hz), 7.68 (d, 2H, J=7.2 Hz), 7.60 (t, 1H, J=6.4 Hz), 7.52 (t, 2H, J=7.6 Hz), 7.43 (t, 1H, J=7.2 Hz). 13C NMR (125 MHz, CDCl3) δ: 172.6, 141.8, 140.1, 132.7, 130.0, 129.3, 129.2, 129.1, 129.0, 128.0, 127.4.

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