Crystal Research and Technology
Cryst. Res. Technol. 41, 728 (2006) - Abstract -

Crystal structure of 4’-O-methylalpinumisoflavone at 90K

R. Kingsford-Adaboh, E. Ahiano, B. Dittrich*, H. Okamoto**, M. Kimura**, and H. Ishida**

Department of Chemistry, University of Ghana, Legon, Accra, Ghana
*Institute of Crystallography/Chemistry, Free University Berlin, Germany
**Department of Chemistry, Faculty of Science, Okayama University, Okayama, Japan

Keywords crystal structure, extraction, demethylation, low temperature
PACS 61.66.Hq
DOI 10.1002/crat.200510656

4’-O-Methylalpinumisoflavone crystals which hitherto had been difficult to crystallize for X-ray diffraction analyses have been obtained from a demethylated product of O, O- dimethylalpinumisoflavone. The structural and conformational features of the crystal measured at 90 K are reported and compared with previously reported work of O,O-dimethylalpinumisoflavone and 5-O-methyl-4’-O-(3-methyl-but-2-en-1-yl) alpinumisoflavone. Each of these compounds is characterized by a six membered ring that is further fused to a benzopyrone isoflavone moiety resulting in a tricyclic ring system. This six membered ring shows a half-chair conformation in all the molecules studied, with the ring in the title compound showing the least Cremer-Pople puckering amplitude Q and shorter inter and intramolecular contacts.




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