Stephaflavone A

Stephaflavone A

Common Name: Stephaflavone A

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

CAS Registry Number: 382145-26-8

InChI:

InChIKey:

Formula: C34H26O10

Molecular Weight: 594.572

Exact Mass: 594.1526

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 12.94 s
6 6.36 d 2.5
7-OCH3 3.87 s
8 6.47 d 2.5
2' 7.48 d 8.8
3' 6.78 d 8.8
4'-OCH3 3.86 s
5' 6.78 d 8.8
6' 7.48 d 8.8
3" 6.55 s
5"-OH 13.02 s
7"-OCH3 3.76 s
8" 6.5 s
2''' 7.81 d 8.8
3''' 6.98 d 8.8
4'''-OCH3 3.88 s
5''' 6.98 d 8.8
6''' 7.81 d 8.8

Carbon NMR Peaks

Position PPM
2 163.5
3 111.8
4 180.2
5 162.3
6 97.9
7 165.4
7-OCH3 55.5
8 92.1
9 157.8
10 105.3
1' 125.5
2' 129.5
3' 113.5
4' 161.2
4'-OCH3 56.2
5' 113.5
6' 129.5
2" 163.8
3" 104.3
4" 181.1
5" 159.5
6" 105.5
7" 163.3
7"-OCH3 55.8
8" 90.3
9" 157.9
10" 105.1
1''' 123.2
2''' 127.8
3''' 114.4
4''' 162.6
4'''-OCH3 55.3
5''' 114.4
6''' 127.8