Investigation of substituted bicyclo[4.2.0]oct-7-en-2-ones by13C NMR spectroscopy

Abstract

1. The isomeric structures in the series of bicyclo[4.2.0]oct-7-en-2-one series were identified by the13C NMR method on the basis of the effect of the substituents. 2. The variations in the chemical shifts of the olefinic13C and1H in the 7-or 8-alkyl-substituted bicyclo[4.2.0]oct-7-en-2-ones under the influence of Eu(dpm)3 confirm the structural assignments in the investigated series of compounds. 3. The formation of the complex between 8-butylbieyclo[4.2.0]oct-7-en-2-one and Eu(dpm)3 leads to conformational changes.