The assignment of the carbon-13 N.M.R. spectra of Westphalen-rearranged steroid olefins with the aid of the lanthanide shift reagent Eu(fod)₃

Abstract

Shifts induced by Eu(fod)₃ in the ¹³C N.M.R. spectra of 5-methyl-19-nor- 5β-cholest-9(10)-en-4β- and -6β-ols are used in conjunction with off- resonance proton decoupling and substituent effects to assign the 27 carbon resonances of the rearranged 5-methyl-19-nor-5β-cholest-9(10)- ene steroid skeleton.