Stephaflavone B

Stephaflavone B

Common Name: Stephaflavone B

Synonyms: [3,​6'-​Bi-​4H-​1-​benzopyran]​-​4,​4'-​dione, 5,​5'-​dihydroxy-​2-​(4-​hydroxyphenyl)​-​7,​7'-​dimethoxy-​2'-​(4-​methoxyphenyl)​-

CAS Registry Number: 382145-27-9

InChI:

InChIKey:

Formula: C33H24O10

Molecular Weight: 580.545

Exact Mass: 580.137

NMR Solvent: CDCl3

MHz: 89.61 (1H), 22.53 (13C)

Calibration: TMS

NMR references: Si, D., Zhong, D., Sha, Y., Li, W. (2001). Biflavonoids from the aerial part of Stephania tetrandra. Phytochemistry 58, 563-566.

Species: Stephania tetrandra - Si, D., Zhong, D., Sha, Y., Li, W. (2001). Biflavonoids from the aerial part of Stephania tetrandra. Phytochemistry 58, 563-566.

Notes: Multiplicities for 13C signals were determined by a DEPT experiment.

Proton NMR Peaks

Position PPM Peak Type J (Hz)
5-OH 12.86 s
6 6.37 d 2.5
7-OCH3 3.87 s
8 6.46 d 2.5
2' 7.41 d 8.8
3' 6.71 d 8.8
5' 6.71 d 8.8
6' 7.41 d 8.8
3" 6.57 s
5"-OH 12.95 s
7"-OCH3 3.76 s
8" 6.49 s
2''' 7.83 d 8.8
3''' 7 d 8.8
4'''-OCH3 3.88 s
5''' 7 d 8.8
6''' 7.83 d 8.8

Carbon NMR Peaks

Position PPM
2 164
3 111.2
4 180.5
5 162
6 98.2
7 165.6
7-OCH3 55.8
8 92.3
9 157.8
10 105.3
1' 124.3
2' 129.7
3' 115.2
4' 159.2
5' 115.2
6' 129.7
2" 164.1
3" 104
4" 181.2
5" 159
6" 105.5
7" 163.5
7"-OCH3 56.2
8" 90.6
9" 158
10" 105
1''' 122.9
2''' 128
3''' 114.4
4''' 162.7
4'''-OCH3 55.4
5''' 114.4
6''' 128