3/16 - 4/4
Glucosinolates. Cyanogenic glycosides.
Volatile natural products
See also T.Robinson,"Organic constituents of higher plants":
Chapters 7 and 15 (glucosinolates, cyanogenic glycosides)
C6, C6 - C1, C6 - C3
Acidity, water-solubility, complexation with metal ions, glycosides.
Structure of lignin.
Flavonoids, C6 - C3 - C6
Basic ring structure, numbering, substitution pattern.
Classes of flavonoids.
A-ring is acetate derived; B-ring is derived from shikimate.
Isolation, separation, spectroscopic structure elucidation of flavonoids:
Spectroscopic structure elucidation of the diflavonoid bryoflavone:
MS, 1H-NMR, UV/VIS
Effect of pH, substitution pattern, complexation with AlCl3 on absorption maxima.
Bathochromic effect; auxochrome.
Compare pp.368-369 in Mann et al.
Hydrolyzable tannins and condensed tannins.
Testing for antioxidant activity of various flavonoids with DPPH (see JAFC 1997(45), 632 - 638).
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