Synthesen von optisch aktiven Carotinoiden mit einer (R)-4-Hydroxy-β-Endgruppe

Synthesis of Optically Active Carotenoids with (R)-4-Hydroxy β-End Groups We describe the synthesis of optically active iso-β-kryptoxanthin ( 12 ; (R)-β,β-caroten-4-ol), iso-α-kryptoxanthins 14 ((4R,6′RS)-β,ε-caroten-4-ol) and 16 ((4R,6′R)-β,ε-caroten-4-ol), 4′-hydroxyechinenone ( 18 ; (R)-4′-hydroxy-β,β-caroten-4-one), and isorubixanthin ( 20 ; (R)-β,ω,-caroten-4-ol), their 400-MHz-¹H-NMR spectra, CD spectra and HPLC behaviour.