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  • Yellow crystal (84.3% yield); m.p.: 171-173 °C (lit. [61] 173-175 °C); UV-Vis (MeOH) λ: 342-343 nm; IR (KBr, cm): 3420 (O-H), 2981-3018 (Ar C-H stretch), 1630 (C=O), 1488-1591 (C=C), 1217-1219 (C-O), 820-822 (C-Cl); H-NMR (600 MHz, CDCl) δ: 14.24 (s, 1H, OH, C-2′), 7.85 (d, 1H, H-β, J = 15.60 Hz), 7.72 (d, 1H, H-α, J = 15.60 Hz), 7.53 (d, 1H, H-2, J = 8.46 Hz), 7.52 (d, 1H, H-6, J = 8.46 Hz), 7.38 (d, 1H, H-3, J = 8.46 Hz), 7.37 (d, 1H, H-5, J = 8.46 Hz), 6.11 (d, 1H, H-3′, J = 2.40 Hz), 5.96 (d, 1H, H-5′, J = 2.40 Hz), 3.92 (s, 3H, OCH, C-6′), 3.84 (s, 3H, OCH, C-4′); EI-MS: m/z = 318 (57), 301 (7), 283 (2), 207 (100), 181 (34), 165 (13), 152 (19), 137 (25), 111 (6), 102 (20); (Molecular formula CHClO). (E)-3-(4-Bromophenyl)-1-(2′-hydroxy-4′,6′-dimethoxyphenyl)prop-2-en-1-one (18).
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