13C NMR spectra of polycyclic compounds and the stereochemistry of norbornadiene dimers and trimers

Abstract

We have obtained the13C NMR spectra of all known dimers and trimers of norbornadiene. We have determined the principles governing the changes in chemical shifts depending on the orientation interactions of the fragments and carried out the stereochemical assignment of all known isomers. We have shown the agreement of the configurations of the latter determined by the13C NMR method with their structures previously established by other methods.