ISSN:
1434-4475
Keywords:
Formylmethylenthiopyranes
;
LIS-method
;
Rotational barriers
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00798952
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