Table 2 13C-NMR (100 MHz) data of lignans 1–4 from the flowers of Forsythia koreana (δ in ppm)
No. | 1a | 2a | 3b | 4a |
|---|---|---|---|---|
1 | 132.8 | 132.9 | 129.5 | 134.2 |
2 | 113.5 | 113.8 | 110.9 | 114.8 |
3 | 150.4 | 151.1 | 146.6 | 150.5 |
4 | 149.0 | 149.3 | 144.5 | 146.1 |
5 | 113.0 | 113.2 | 114.4 | 117.9 |
6 | 122.0 | 122.3 | 121.3 | 122.2 |
7 | 38.8 | 39.1 | 38.2 | 38.8 |
8 | 42.4 | 42.6 | 40.9 | 42.5 |
9 | 72.9 | 73.1 | 71.3 | 72.9 |
1′ | 130.7 | 134.4 | 129.7 | 131.3 |
2′ | 113.8 | 115.0 | 111.4 | 113.3 |
3′ | 149.1 | 150.8 | 146.7 | 149.0 |
4′ | 146.4 | 147.0 | 144.3 | 146.2 |
5′ | 116.1 | 118.0 | 114.0 | 116.2 |
6′ | 123.0 | 123.1 | 122.0 | 123.0 |
7′ | 35.4 | 35.6 | 34.5 | 35.4 |
8′ | 47.7 | 47.8 | 46.5 | 47.7 |
9′ | 181.5 | 181.5 | 179.1 | 181.3 |
1″ | – | 103.1 | – | 102.8 |
2″ | – | 75.1 | – | 74.8 |
3″ | – | 78.0 | – | 77.8 |
4″ | – | 71.5 | – | 71.3 |
5″ | – | 78.3 | – | 78.1 |
6″ | – | 62.7 | – | 62.4 |
OMe | 56.4 | 56.9 | 55.8 | 56.7 |
OMe | 56.3 | 56.8 | 55.7 | 56.6 |
OMe | 56.3 | 56.7 | – | – |