The amide groups of poly(N-methyl laurolactam), poly(N-ethyl laurolactam) and poly(N-benzyl laurolactam) were shown by PMR and CMR to acquire both theantiandsynconformations in CDCl3at 30°C. At 80°C, the PMR signals of the two conformations collapsed to one signal, at an intermediate chemical shift. Theanti - synPMR and/or CMR signals were displayed by carbon nuclei and protons of all the groups which are directly bonded to the amide moieties in the three polymers. The magnetic non-equivalence of the carbon nuclei and protons of a number of other groups which are not directly linked to the amide functions was also demonstrated.