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'Conformational Analysis Methylation' in keywords Facet   Publication Year 1979  [X]
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1979[X]
1Author    Heinz Falk, Klaus ThirringRequires cookie*
 Title    On the Chemistry of Pyrrole Pigments, XXXIV [1] On the Configurations and Conformations of Diastereomeric N-Methyl-O-methyl-bilatrienes-abc  
 Abstract    of the aetiobiliverdin-IV-y-lactimether yields a lactam-N-methylated derivative the structure of which was proven by an ether cleavage and iH NMR spectro-scopy. The configuration (Z,Z,Z) was deduced from iHNMR experiments. Photo-isomerization exclusively forms the (E,Z,Z) diastereomer. By conformational analysis using the LIS technique and correlations of UV-VIS spectra and PPP-type calculations a more or less helical arrangement for the two diastereomers was confirmed. The twisting is maximal at the methine single bond adjacent to the site of N-methylation, the overall geometry seems to be much more distorted than the non methylated derivatives. 
  Reference    Z. Naturforsch. 34b, 1600—1605 (1979); eingegangen am 13. Juli 1979 
  Published    1979 
  Keywords    X H NMR, UV-VIS, Lanthanide Ion Induced Shifts, PPP-Calculations, Conformational Analysis Methylation 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-1600.pdf 
 Identifier    ZNB-1979-34b-1600 
 Volume    34