Carbon-13 NMR study of poly(menthyl vinyl ether) obtained by different catalytic systems

Optically active poly(menthy1 vinyl ethers) prepared under different polymerization conditions have been studied by 13C NMR. Resonance assignments, relaxation times TI, and nuclear Overhauser enhancement factors (NOEF) were obtained at 21.14 and 46.15 kG. Analysis of these parameters gives information about main-chain configuration, in terms of dyad tacticity, and about side-chain mobility. The results are attributed to strong steric interactions between the bulky menthyl group and the growing chain during the polymerization process