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

摘要: 4′-O-Methylalpinumisoflavone crystals which hitherto had been difficult to crystallize for X-ray diffraction analyses have obtained from a demethylated product of O, O-dimethylalpinumisoflavone. The structural and conformational features the crystal measured at 90 K are reported compared with previously work O,O-dimethylalpinumisoflavone 5-O-methyl-4′-O-(3-methyl-but-2-en-1-yl) alpinumisoflavone. Each these compounds is characterized by six membered ring that further fused benzopyrone isoflavone moiety resulting in tricyclic system. This shows half-chair conformation all molecules studied, title compound showing least Cremer-Pople puckering amplitude Q shorter inter intramolecular contacts. (© 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)