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Alpinumisoflavone.

Harrison JJ, Tabuchi Y, Ishida H, Kingsford-Adaboh R - Acta Crystallogr Sect E Struct Rep Online (2008)

Bottom Line: Both ring systems show an out-of-plane twist.The dihedral angle between the mean plane of the benzopyrone system and the benzene ring is 54.29 (3)°.The mol-ecules are linked by O-H⋯O hydrogen bonds, forming a mol-ecular tape running along the b axis.

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ABSTRACT
The title compound, C(20)H(16)O(5), {systematic name: 5-hydr-oxy-7-(4-hydroxy-phen-yl)-2,2-dimethyl-2H,6H-benzo[1,2-b:5,4-b']dipyran-6-one}, was obtained by demethyl-ation of the biologically active related compound, 4-O-methyl-alpinum-iso-flavone. The mol-ecular structure of the title compound is characterized by a fused tricyclic system that contains an approximately planar benzopyrone ring fragment. The six membered pyran ring adopts a half-chair conformation. Both ring systems show an out-of-plane twist. The dihedral angle between the mean plane of the benzopyrone system and the benzene ring is 54.29 (3)°. The mol-ecules are linked by O-H⋯O hydrogen bonds, forming a mol-ecular tape running along the b axis.

No MeSH data available.


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Crystal packing viewed on the a-c plane. Hydrogen bonds are shown as broken lines.
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Fap2: Crystal packing viewed on the a-c plane. Hydrogen bonds are shown as broken lines.


Alpinumisoflavone.

Harrison JJ, Tabuchi Y, Ishida H, Kingsford-Adaboh R - Acta Crystallogr Sect E Struct Rep Online (2008)

Crystal packing viewed on the a-c plane. Hydrogen bonds are shown as broken lines.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC2960904&req=5

Fap2: Crystal packing viewed on the a-c plane. Hydrogen bonds are shown as broken lines.
Bottom Line: Both ring systems show an out-of-plane twist.The dihedral angle between the mean plane of the benzopyrone system and the benzene ring is 54.29 (3)°.The mol-ecules are linked by O-H⋯O hydrogen bonds, forming a mol-ecular tape running along the b axis.

View Article: PubMed Central - HTML - PubMed

ABSTRACT
The title compound, C(20)H(16)O(5), {systematic name: 5-hydr-oxy-7-(4-hydroxy-phen-yl)-2,2-dimethyl-2H,6H-benzo[1,2-b:5,4-b']dipyran-6-one}, was obtained by demethyl-ation of the biologically active related compound, 4-O-methyl-alpinum-iso-flavone. The mol-ecular structure of the title compound is characterized by a fused tricyclic system that contains an approximately planar benzopyrone ring fragment. The six membered pyran ring adopts a half-chair conformation. Both ring systems show an out-of-plane twist. The dihedral angle between the mean plane of the benzopyrone system and the benzene ring is 54.29 (3)°. The mol-ecules are linked by O-H⋯O hydrogen bonds, forming a mol-ecular tape running along the b axis.

No MeSH data available.


Related in: MedlinePlus