Abstract
A study of the neighbouring group effects on the 1H and 13C chemical shifts and the results of NOE experiments have allowed the identification of the stereoisomers of alkylidene cylopentenones. Various long range coupling constants have been measured and their signs determined by selective decoupling. The mechanisms and angular dependences of these couplings have been discussed. The Π contributions are predominant and the absolute value of 4J transoid associated with a dihedral angle of 30° is higher than the corresponding value of 4J cisoid.
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