Table 1.
The 1H and 13C-NMR signal assignments for CNPC in comparison with C based on 2-D COSY (Figure 2B) and HSQC and HMBC (Figure 3B) experiments in CDCl3.
| Species → | C | CNPC | ||
|---|---|---|---|---|
| Atom no ↓ | 13C | 1H | 13C | 1H |
| 1 | 35.6 | 2.88 (bm) | 34.6 a; 34.7 b | 3.13 (bs) |
| 2 2′ |
53.0 | 3.02 (AB spectrum) | 51.1 a 52.2 b |
3.34 (d, J2,2′ = 13.6 Hz) a 3.36 (d, J2,2′ = 13.1 Hz) b 4.41 (d) a 4.24 (d) b |
| 3 | - | 1.30 (bs) | - | |
| 4 4′ |
54.0 | 2.99 (bm) | 50.5 a 51.8 b |
3.15 (d, J4,4′ = 12.0 Hz) a 3.18 (d, J4,4′ = 12.0 Hz) b 4.32 (d) a 4.37 (d) b |
| 5 | 27.8 | 2.30 (bm) | 27.4 | 2.55 (bs) |
| 6 6′ |
49.8 | 4.10 (d, J6,6′ = 15.8 Hz) 3.87 (dd, J6′,5 = 6.7 Hz) |
48.8 a 48.9 b |
3.86 (d, J6,6′ = 16.1 Hz) a 3.88 (d, J6,6′ = 16.1 Hz) b 4.36 (d) a 4.23 (d) b |
| 7 | - | - | - | |
| 8 | 163.7 | - | 163.4; 163.3 | - |
| 9 | 116.8 | 6.43 (d, J9,10 = 8.8 Hz) | 117.4 | 6.45 (d, J9,10 = 9.0 Hz) a 6.47 (d, J9,10 = 9.0 Hz) b |
| 10 | 138.8 | 7.27 (dd) | 138.8 b 139.3 a |
7.27 (dd) a 7.29 (dd) b |
| 11 | 105.0 | 5.97 (d, J10,11 = 7.2 Hz) | 105.4 a 106.2 b | 6.09 (d, J10,11 = 6.7 Hz) a + b |
| 12 | 151.1 | - | 152.4; 152.6 | - |
| 13, 13′ | 26.3 | 1.93 (bm) | 25.9 a 25.8 b |
2.05 (bs) |
| 14 | 148.5; 148.0 | - | ||
| 15 | 145.0; 144.8 | - | ||
| 16 | 122.5 a 122.2 b |
7.12 (d, J16,17 = 9.0 Hz) a 54% 6.92 (d, J16,17 = 9.0 Hz) b 46% |
||
| 17 | 125.1 a 125.0 b |
8.16 (d) a 8.13 (d) b |
||
| 18 | 155.8 | - | ||