Investigations on N,N‐dialkylbenzamides by NMR spectroscopy: 5—Analysis of static and dynamic proton NMR spectra of 2‐fluoro‐ and 2,6‐difluoro‐N,N‐dimethyl‐ and N,N‐diethyl‐benzamides

The analysis of static and dynamic proton NMR spectra of 2‐fluoro‐ and 2,6‐difluoro‐ N , N ‐dimethyl‐ and N , N ‐diethyl‐benzamides at various temperatures has been carried out. The conformations of the compounds have been deduced on the basis of long‐range through‐space proton‐fluorine couplings. Free energies of activation of amide rotation have been determined for all compounds, and of carbonyl‐ring rotation for one compound.