Abstract
As has been shown in previous Chapters the Wittig and the Horner-Emmons reactions are of utmost importance for the coupling of carotenoid end groups with the polyene chain. In the following example, the synthesis of the naturally occurring C25-apocarotenal 507 (12′-apo-β- caroten-12′-al, β-apo-12′-carotenal) and also ethyl 8’-apo-β-caroten-8’-oate (1) (β-apo-8′- carotenoic acid ethyl ester), which is produced industrially by means of these reactions, is described.
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