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1981 (1)
1Author    Harald Lehner, Corinna Krauss, Hugo ScheerRequires cookie*
 Title    Solvent Induced Circular Dichroism in Conformational Analysis: Bile Pigments  
 Abstract    The applicability of solvent induced circular dichroism (SICD) for the conformational analysis of bile pigments has been investigated. The S-(—)-ethyl lactate induced rotational strengths for octaethylbilindion (4) and its dihydroderivative 5 are remarkably high. Related compounds, e.g. the isomeric purpurines 1 and 2 and formyltripyrrinon 3 exhibit an optical activity which is smaller by more than one order of magnitude. 1-3 are essen-tially free from steric strain so that a flat arrangement of the chromophore is most likely. On the other hand the closed conformations of 4 and 5 experience considerable steric repulsion of their terminal rings, so that a helical topology is energetically favoured. This distinction is reflected in the magnitude of the SICD observed and demonstrates its applicability for the conformational analysis of bile pigments. 
  Reference    Z. Naturforsch. 36b, 735—738 (1981); received November 21 1980 
  Published    1981 
  Keywords    Solvent Induced Circular Dichroism, Conformation, Enantiomerization, Purpurines, Bilatrienes 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0735.pdf 
 Identifier    ZNB-1981-36b-0735 
 Volume    36