3,3',5,7-tetramethoxy-2'-(4-methoxyphenyl)-3',4'-dihydro-2'H,7'H-spiro[chromane-2,8'-chromene]-4,7'-dione

3,3',5,7-tetramethoxy-2'-(4-methoxyphenyl)-3',4'-dihydro-2'H,7'H-spiro[chromane-2,8'-chromene]-4,7'-dione

Common Name: 3,3',5,7-tetramethoxy-2'-(4-methoxyphenyl)-3',4'-dihydro-2'H,7'H-spiro[chromane-2,8'-chromene]-4,7'-dione

Synonyms:

CAS Registry Number: 142705-61-1

InChI:

InChIKey:

Formula: C28H28O9

Molecular Weight: 508.52

Exact Mass: 508.1733

NMR Solvent: CDCl3

MHz: 300 (1H), 75.4 (13C)

Calibration: TMS

NMR references: Baba, K., Taniguchi, M., Kozawa, M. (1992) A Spirobiflavonoid Genkwanol B from Daphne Genkwa. Phytochemistry 31, 975-980.

Species: synthesis from Genkwanol B - Baba, K., Taniguchi, M., Kozawa, M. (1992) A Spirobiflavonoid Genkwanol B from Daphne Genkwa. Phytochemistry 31, 975-980.

Notes:

Proton NMR Peaks

Position PPM Peak Type J (Hz)
2 4.79 d 7.6
3 3.75 m
4 2.52 dd 16.2, 5.4
4 2.4 dd 16.2, 7.7
5 6.89 d 9.8
6 5.95 d 9.8
2', 6' 6.87 d 8.8
3', 5' 6.68 d 8.8
3" 4.57 s
6" 6 d 2.2
8" 6.08 d 2.2
OCH3 3.81 s
OCH3 3.76 s
OCH3 3.7 s
OCH3 3.57 s
OCH3 3.15 s

Carbon NMR Peaks

Position PPM
2 79.69
3 76.39
4 29.6
10 105.24
5 148.1
6 118.46
7 195.17
8 80.69
9 156.12
1' 129.99
2', 6' 127.96
3', 5' 113.79
4' 159.74
3" 82.13
4" 188.57
10'' 105.54
5" 161.82
6" 93.54
7" 166.08
8" 93.71
9'' 163.03
3"-OCH3 61.69
3-OCH3 57.74
OCH3 56.46
OCH3 55.89
OCH3 55.48