- Title
- Novel components of Acacia mearnsii
- Creator
- Ilsley, Anthony Hugh
- ThesisAdvisor
- Drewes, S E
- Date
- 1969
- Type
- Thesis
- Type
- Masters
- Type
- MSc
- Identifier
- vital:21164
- Identifier
- http://hdl.handle.net/10962/6673
- Description
- From Summary: From the complex mixture of flavonoid components present in the heartwood of the black wattle tree (Acacia mearnsii) four new compounds have been isolated. These include a novel dioxane-linked dimeric proanthocyanidin based on leucofisetinidin. This is the first proanthocyanidin of its type to be isolated from a natural source. I solation was achieved by standard counter current partition separation and preparative paper chromatographic techniques. The compound, which forms an anthocyanidin, was identified by micro-degradation, and n.m.r. and mass spectrometry. Comparison of the spin-spin coupling constants of the heterocylic rings' protons with those of authentic monomeric flavan-3, 4-diols showed that the heterocyclic rings of the two symmetrical flavan moeities have 2,3-trans-3,4-cis configurations. Dreiding models suggest that the central dioxane ring has a half-boat conformation while the heterocyclic rings of the two flavan units have five point coplanar conformations. Two possible absolute configurations have been proposed
- Format
- 91 leaves, pdf
- Publisher
- Rhodes University, Faculty of Science, Chemistry
- Language
- English
- Rights
- Ilsley, Anthony Hugh
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Collections
RU Department of Chemistry
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