Table 1.
1H-NMR data of polyphenols isolated from Acacia hydaspica (Coupling constant J in Hertz)
| Proton | 7-O-galloyl catechin δ in ppm (C1)a |
(+)-catechin δ in ppm (C2)a |
Methyl gallate δ in ppm (C3)b |
|---|---|---|---|
| H-2 | 4.61 (d, J = 7.0 Hz) | 4.46 (d, J = 7.6 Hz) | 7.11 (s) |
| H-3 | 3.88–3.94 (m) | 3.79–3.82 (m) | 3.79 (s, OCH3) |
| H-4α b |
2.71 (dd, J = 16.3 Hz, J = 5.3 Hz) 2.45 (dd, J = 16.5, 7.9 Hz) |
2.64 (dd, J = 16.4, 5.3 Hz) 2.33 (dd, J = 16.1, 7.9 Hz) |
– |
| H-6 | 6.11 (d, J = 2.2 Hz) | 5.67 (d, J = 2.3 Hz) | 7.11 (s) |
| H-8 | 6.17 (d, J = 2.2 Hz | 5.87 (d, J = 1.8 Hz) | – |
| H-2′ | 6.72 (d, J = 1.5 Hz) | 6.70 (d, J = 1.8) | – |
| H-5′ | 6.68 (d, J = 8.1 Hz) | 6.67 (d, J = 8.2 Hz) | – |
| H-6′ | 6.60 (dd, J = 8.1 Hz, J = 1.5 Hz) | 6.57 (dd, J = 8.2 Hz, J = 1.8 Hz) | – |
| OH-3 | 5.01 (d, J = 5.1 Hz) | 4.84 (d, J = 4.7 Hz) | – |
| Galloyl | 7.04 (s) | – | – |
Coupling constants (Hz) in parenthesis, a DMSO-d6 b indicates acetone–d6. Dashes indicate that given proton is absent the molecule