Table 1 1H (600 MHz), 13C NMR (150 MHz) and HMBC data for compound 1 in DMSO-d6
From: A pair of new enantiomers of xanthones from the stems and leaves of Cratoxylum cochinchinense
Position | 1H-NMR (mult, J in Hz) | 13C–NMR | HMBC (1H → 13C) |
|---|---|---|---|
1 | Â | 158.0 | Â |
2 | Â | 108.0 | Â |
3 | Â | 163.5 | Â |
4 | Â | 106.3 | Â |
5 | 7.46 (1H, d, J = 9.0 Hz) | 118.6 | C-7, 8a, 10a |
6 | 7.28 (1H, dd, J = 9.0, 3.0 Hz) | 124.4 | C-8, 10a |
7 | Â | 153.8 | Â |
8 | 7.40 (1H, d, J = 3.0 Hz) | 107.9 | C-6, 9, 10a |
9 | Â | 179.9 | Â |
4a | Â | 152.9 | Â |
8a | Â | 120.1 | Â |
9a | Â | 101.5 | Â |
10a | Â | 149.0 | Â |
1′ | 2.95 (1H, dd, J = 14.7, 3.1 Hz) 2.82 (1H, dd, J = 14.7, 8.0 Hz) | 28.9 | C-1, 2, 3, 2′, 3′ |
2′ | 4.24 (1H, dd, J = 8.0, 2.3 Hz) | 74.8 | C-2, 1′, 3′ |
3′ |  | 147.1 |  |
4′ | 4.89 and 4.75 (each 1H, s) | 110.0 | C-2′, 3′, 5′ |
5′ | 1.76 (3H, s) | 18.1 | C-2′, 3′, 4′ |
1″ | 3.43 (2H, d, J = 7.2 Hz) | 21.6 | C-3, 4, 4a, 2″, 3″ |
2″ | 5.19 (1H, t, J = 7.2 Hz) | 122.5 | C-1″, 4″, 5″ |
3″ |  | 130.6 |  |
4″ | 1.82 (3H, s) | 17.8 | C-2″, 3″, 5″ |
5″ | 1.62 (3H, s) | 25.6 | C-2″, 3″ |
1-OH | 13.35 (1H, s) | Â | C-1, 2, 9a |
7-OH | 9.95 (1H, s) | Â | C-6, 7, 8 |