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  • 1
    Electronic Resource
    Electronic Resource
    Distribution and chemotaxonomic significance of flavonoids inAloe (Asphodelaceae) (1998)
    Springer
    Plant systematics and evolution 211 (1998), S. 31-42 
    Details
    ISSN: 1615-6110
    Keywords: Aloe ; Asphodelaceae ; Chemotaxonomy ; flavonoids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A chemotaxonomic study of practically all the species of the genusAloe showed that flavonoids occur as major compounds in 31 out of a total of 380 species investigated. Flavanones and dihydroflavonols are present in the exudate of species inAloe ser.Rhodacanthae andSuperpositae and also in a number of the endemic species from Madagascar. Flavones occur as the only major compound in the leaf extracts of the sects.Leptoaloe andGraminialoe. In ser.Macrifoliae and inLomatophyllum, the sister genus ofAloe, isovitexin co-occurred with theC-glucosylanthrone aloin. The chemotaxonomic implication of these results are discussed together with the significance of the taxonomic and chemogeographical distribution of flavonoids inAloe. With a few rare exceptions, the leaf compounds from two different biogenetic pathways (polyketide pathway and flavonoid pathway) are mutually exclusive. Since flavonoids are restricted to the basal groups inAloe, we conclude that flavonoids are plesiomorphic characters inAloe reflecting ancient phylogenetic and biogeographic links.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00984910
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Complete 1H and 13C NMR spectral assignment of pentacyclo [6.4.0.02,6.05,9.04,12]dodecane derivatives and structure elucidation of pentacyclo [6.4.0.02,6.03,11.05,9]dodecane (1993)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 31 (1993), S. 578-584 
    Details
    ISSN: 0749-1581
    Keywords: Pentacyclododecane molecules ; 1H NMR ; 13C NMR ; Homo-and heteronuclear SPI experiments ; NOE difference spectra ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Treatment of pentacyclo[6.4.0.02,6.05,9.04,12]dodecane-2-ol with concentrated sulphuric acid produced the rearranged hydrocarbon pentacyclo[6.4.0.02,6.03,11.05,9]dodecane as the main product. High-field 1H and 13C NMR techniques were used in the structure elucidation and assignment of the different NMR resonances of these two and related compounds.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260310611
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    Paper (German National Licenses)
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