Two crystal polymorphs of a flavonoid from Melicope ellyrana.

Journal Article (Journal Article)

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], C(23)H(24)O(8). 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.

Full Text

Duke Authors

Cited Authors

  • Smith, G; Bartley, JP; Wang, E; Bott, RC

Published Date

  • November 2001

Published In

Volume / Issue

  • 57 / Pt 11

Start / End Page

  • 1336 - 1337

PubMed ID

  • 11706267

International Standard Serial Number (ISSN)

  • 0108-2701

Digital Object Identifier (DOI)

  • 10.1107/s0108270101013695


  • eng

Conference Location

  • United States