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- W2015543498 abstract "The Diastereomeric Aurochromes: Their Synthesis, Analysis and Chiroptical Properties (all-E)-Aurochrome (5,8:5′,8′-diepoxy-5,8,5′,8′-tetrahydro-β,β-carotene; 1) has two pairs of constitutionally identical chiral centres and, therefore, is expected to exist in four pairs of enantiomers and two meso-forms. Using starting materials with well-defined configuration, we performed the syntheses of the following pure aurochromes: (5R,8R,5′R,8′R)-aurochrome (2) and its racemate, Meso-(5R,8R,5′S,8′S)-aurochrome (3), (5 R,8 S,5′ R,8′ S)-aurochrome (4) and its racemate, meso-(5R,8S,5′S,8′R)-aurochrome (5), (5R,8R,5′R,8′S)-aurochrome (6) and its racemate. The (5RS,8RS,5′SR,8′RS)-aurochrome (7) was detected chromatographically, using a HPLC system that allows clean separation of the four racemic- (or optically active) and the two meso-aurochromes. The optically active autochromes 2 and 4 exhibit non-conservative CD spectra with strong Cotton effects of opposite but not mirror-like tracings. Solutions of aurochromes in CHCl3, in the presence of HCl, undergo epimerization at C(8). Those epimers with CH3 trans to C(9) slightly predominate under equilibrium conditions. Deprotonation of the phosphonate (±)-14 with strong base causes isomerization at the terminal oxirane into a dihydrofuran. This reaction allowed convenient syntheses of the diastereoisomeric aurochromes (±)-2, 3, (±)-4, 5, (±)-6, and (±)-7 and of (5RS, 8RS)- and (5RS, 8SR)-12′-apo-aurochrome-12′-als (21 and 22, respectively)." @default.
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- W2015543498 date "1984-03-14" @default.
- W2015543498 modified "2023-09-29" @default.
- W2015543498 title "Die diasteromeren Aurochrome: Synthese, Analytik und Chiroptische Eigenschaften" @default.
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- W2015543498 doi "https://doi.org/10.1002/hlca.19840670218" @default.
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