## Abstract By chemical degradation and application of the modified __Horeau__ method the xanthophylls of __Trentepohlia iolithus__, namely **1a**, **2a** and **3a**, have been shown to possess the (2 __R__, 6′ __R__)‐, (2__R__)‐, and (2__R__, 2′ __R__)‐configurations respectively.
Synthese von (R)-β, β-Carotin-2-ol und (2R, 2′R)-β, β-Carotin-2,2′-diol
✍ Scribed by Samuel Gut; Heinz Wolleb; Hanspeter Pfander
- Publisher
- John Wiley and Sons
- Year
- 1989
- Tongue
- German
- Weight
- 382 KB
- Volume
- 72
- Category
- Article
- ISSN
- 0018-019X
No coin nor oath required. For personal study only.
📜 SIMILAR VOLUMES
**Synthesis of nor‐β‐cyclocitral, norsafranal, and 2, 2′‐dinor‐β‐carotene** The synthesis of 2, 2′‐dinor‐β‐carotene (**10**) __via__ norsafranal (**5**) and nor‐β‐cyclocitral (**6**) is described.
**Isozeaxanthin: Chirality and Enantioselective Synthesis of (4__R__,4′__R__)‐Isozeaxanthin ((−)‐(4__R__,4′__R__)‐β, β‐Carotin‐4,4′‐diol)** The absolute configuration of optically active isozeaxanthin was established by synthesis using (−)‐(__R__)‐4‐hydroxy‐β‐ionon (**2**) [18] as starting material
## Abstract Es wird eine Synthese des 2,2′‐Dimethyl‐β‐carotins beschrieben. Die Substanz besitzt im Rattenversuch ungefähr die Hälfte der Vitamin‐A‐Wirkung des β‐Carotins.
**Synthesis and Chirality of (5__R__, 6__R__)‐5,6‐Dihydro‐β, ψ‐carotene‐5,6‐diol, (5__R__, 6__R__, 6′__R__)‐5,6‐Dihydro‐β, ε‐carotene‐5,6‐diol, (5__S__, 6__R__)‐5,6‐Epoxy‐5,6‐dihydro‐β,ψ‐carotene and (5__S__, 6__R__, 6′__R__)‐5,6‐Epoxy‐5,6‐dihydro‐β,ε‐carotene** __Wittig__‐condensation of optically
**Synthesis and Chirality of (5__S__,6__R__)‐5,6‐Epoxy‐5,6‐dihydro‐β,β‐carotene and (5__R__,6__R__)‐5,6‐Dihydro‐β,β‐carotene‐5,6‐diol, a Compound with Unexpected Solubility Characteristics** __Wittig__‐condensation of azafrinal (**1e**) with the phosphorane derived from **7** leads to a (1:3)‐mixtu