Kombinierte d-NMR- und LIS-Untersuchungen zum konformativen Verhalten von Formylmethylenthiopyranen |
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| Authors: | Matthias Kretschmer E. Kleinpeter M. Pulst R. Borsdorf |
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| Affiliation: | 1. Sektion Chemie, Karl-Marx-Universit?t Leipzig, DDR-7010, Leipzig, Deutsche Demokratische Republik
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| Abstract: | The rotational barriers ΔG ≠ toE,Z- ands-cis, s-trans-isomerisation in formylmethylenthiopyranes are determined and discussed with regard to their dependence on substituent effects. Preferential conformers are distinguished by lanthanide induced shifts. Best fits between calculated and experimental shifts are obtained forE,s-trans andZ,s-cis isomers. The results indicate a nonbonding interaction between aldehyde oxygen and ring sulphur, favourings-cis conformation in case ofZ configuration. |
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