Table 2.
13C NMR data of polyphenols isolated from Acacia hydaspica ethyl-acetate extract
| Carbon | 7-O-galloyl-catechins δ in ppm (GC; C1)a |
(+)-catechins δ in ppm (C; C2)a |
Methyl gallate δ in ppm (MG; C3)b |
|---|---|---|---|
| C-1 | – | – | 120.912 |
| C-2 | 81.975 | 81.411 | 108.901 |
| C-3 | 66.941 | 66.717 | 145.121 |
| C-4 | 27.211 | 28.012 | 137.760 |
| C-4a | 105.957 | 99.331 | – |
| C-6 | 100.946 | 94.314 | 108.901 |
| C-8 | 104.521 | 95.389 | – |
| C-5 | 155.354 | 156.317 | 145.120 |
| C-7 | 150.343 | 156.317 | – |
| C-8a | 156.070 | 156.317 | – |
| C-1′ | 130.656 | 130.870 | – |
| C-2′ | 113.832 | 114.026 | – |
| C-3′ | – | 146.281 | – |
| C-4′ | – | 145.206 | – |
| C-5′ | 114.548 | 115.101 | – |
| C-6′ | – | 118.685 | – |
| C-1 galloyl | 119.201 | – | – |
| C-2 galloyl | 109.179 | – | – |
| C-3 galloyl | 144.973 | – | – |
| C-4 galloyl | 138.881 | – | – |
| C-5 galloyl | 144.973 | – | – |
| C-6 galloyl | 109.179 | – | – |
| COO– | 165.734 | – | – |
| C=O | – | – | 166.270 |
| Methyl | – | – | 51.012 |
a DMSO-d6 and b indicates acetone–d6. Dashes indicate that given carbon is not present in the molecule