A wide variety of push–pull alkenes were studied by means of variable‐temperature 1H and 13C NMR spectroscopy with respect to the configuration/conformation and the barriers to rotation about partial CC and CN double bonds. For the assignment of the 13C NMR spectra especially the semi‐selective INEPT pulse sequence and an incremental system for estimating the 13C chemical shift values of aromatic carbon atoms proved useful. The influence of thioether, sulphone and sulphoxide moieties in the acceptor part of the push–pull system on the π‐electron distribution is critically considered.
No takes yet. Share an insight, caveat, or question.
Kleinpeter et al. (1993) studied this question.
Synapse has enriched 5 related papers. Consider them for comparative context: