Table 1.
Melting point | 271-72°C |
---|---|
TLC pattern | Solvent system: benzene:ethyl acetate (7:3) RF value: 0.45 |
UV(MeOH) | (log ε): 255(4.26), 274 (4.18) and 346 nm (4.21) |
IR (KBr) cm-1 | 3480, 1664 and 1559 |
1H NMR (CDCl3) | δ 12.62 (1 H, s, O - H), 7.75 (2 H, m, 2' - H and 6' - H), 7.01 (1 H, d, J = 9.0 Hz, 5' - H), 6.51 (1 H, s, 8 - H), 3.98 (9 H, s, 3 × OCH3), 3.93 (3 H, s, OCH3) and 3.87 (3 H, s, OCH3). |
13C NMR | δ 158.7 (C - 2), 132.4 (C - 3), 178.8 (C - 4), 155.7 (C-5), 138.8 (C-6), 152.7 (C-7), 90.3 (C- 8), 151.5 (C-9), 106.6 (C-10), 122.9 (C-1'), 111.7 (C-2'), 148.9 (C-3'), 152.2 (C-4'), 111.6 (C-5'), 122.1 (C-6'), 60.7 (6-OCH3), 56.1 (7-OCH3), 60.1 (3-OCH3), 56.2 (3' - OCH3) and 55.9 (4' - OCH3). |