“…The product was prepared as described in the typical procedure for 4b and isolated through flash chromatography using petroleum ether/ethyl acetate = 100/1 as a yellow oil in 86% yield (308 mg for 4a , X = Br): R f = 0.39 (petroleum ether/ethyl acetate = 50/1); IR (cm –1 , KBr): 3045, 2369, 2345, 2323, 1653, 1559, 1539, 1507, 1457, 1270, 759, 699; 1 H NMR (CDCl 3 , 500 MHz) δ (ppm) 7.79 (d, J = 7.7 Hz, 1H), 7.67 (t, J = 7.7 Hz, 1H), 7.60–7.58 (m, 2H), 7.55–7.51 (m, 3H), 7.49–7.46 (m, 2H); 13 C{ 1 H} NMR (CDCl 3 , 125 MHz) δ (ppm) 145.5, 138.2, 133.8, 132.8, 130.1, 128.8, 128.7, 127.5, 118.7, 111.3. Data were consistent with those reported in the literature …”