ChemInform Abstract: C45- and C50-Carotenoids. Part 5. Synthesis of an Optically Active Cyclic C20-Building Block and of (2R,2′S)-3′,4′-Didehydro-1′,2′-dihydro-2-(4-hydroxy-3-methylbut-2-enyl)-2′-(3-methylbut-2-enyl)-β,ψ-caroten-1′-ol( = C.p. 473).

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