Structural Variation of the Flavonoids of Asteraceae
We concern ourselves in this chapter with a moderately detailed view of the flavonoid chemistry of Asteraceae. Attention will be given to the individual flavonoid types that have been reported, flavones, flavonols, flavanones, chalcones, and the like, and to the diversity of substitution patterns that underlie the richness of the family’s pigment profile. Adding to this richness are the various types of derivatives of each of the main structural types: 0-methyl ethers, C-alkyl groups, both O- and C-linked glycosides, acylated forms of the glycosides, sulphates, etc. Combinations of these features add further to the variety of structures known. Owing to the shear mass of data available much of the information will be presented in tabulated form whenever practicable.
KeywordsStructural Variation Dimethyl Ether Methyl Ether Coniferyl Alcohol Acylating Acid
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