Structure and Chirality
Naturally occurring carotenoids display considerable structural diversity, including different carbon skeletons, various types of oxygen functions and variable degree of unsaturation (double-bond equivalents) due to cyclization, double, triple or allenic bonds. In the Carotenoids Handbook the structures and properties of the known naturally occurring carotenoids (published up to 2003) are presented in two groups, (i) those considered to be proved unequivocally (Main List, some 500 compounds) and (ii) those requiring additional supporting evidence or proof of natural occurrence (Supplementary List, some 225 compounds).
KeywordsNuclear Magnetic Resonance Circular Dichroism Nuclear Magnetic Resonance Spectroscopy Chiral Centre Nuclear Magnetic Resonance Technique
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