| | 1 | Author
| Heinz Falk, Klaus Thirring | Requires 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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| default:Reihe_B/34/ZNB-1979-34b-1600.pdf | | | | Identifier
| ZNB-1979-34b-1600 | | | | Volume
| 34 | |
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