Jerry Joe Ebow Kingsley Harrison, Youhei Tabuchi, Hiroyuki Ishida, Robert Kingsford-Adaboh

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


The title compound, C20H16O5, {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.

Original languageEnglish
Pages (from-to)o713
JournalActa Crystallographica Section E: Structure Reports Online
Issue number4
Publication statusPublished - Mar 5 2008

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics


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