Acta Crystallographica Section C

Crystal Structure Communications

Volume 57, Part 11 (November 2001)

Acta Cryst. (2001). C57, 1336-1337 [doi:10.1107/S0108270101013695]

Two crystal polymorphs of a flavonoid from Melicope ellyrana

G. Smith, J. P. Bartley, E. Wang and R. C. Bott

Abstract: The crystal structure determinations of two crystalline components of the hexane extract of the fruit of the indigenous Australian tree Melicope ellyrana have shown them to be polymorphs of the same compound, namely the flavonoid 4',5-dihydroxy-3,3',8-trimethoxy-7-(3-methylbut-2-enyloxy)flavone [systematic name: 5-hydroxy-2-(4-hydroxy-3-methoxyphenyl)-3,8-dimethoxy-7-(3-methylbut-2-enyloxy)-4H-1-benzopyran-4-one], C₂₃H₂₄O₈. The two polymorphs, one monoclinic (polymorph A) and the other triclinic (polymorph B), show significant conformational differences, particularly in the enyloxy side chain, while only one (polymorph A) shows intermolecular hydrogen bonding.

Formula: Two polymorphs of C₂₃H₂₄O₈

Online 13 November 2001


	Structure factor file (CIF format) (107.3 kbytes) Contains datablock I

	Structure factor file (CIF format) (102.3 kbytes) Contains datablock II

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