Abstract
The 13 C NMR analysis of the initiation step is applied to the study of the isotactic propene polymerization. Catalytic systems containing internal bases in the absence and in the presence of external bases are studied. The fact that the increase of isotactic productivity here observed, due to the presence of either internal or the external base, is accompanied by a change of the first step stereoregulatory gives evidence of the direct participation of the Lewis base on the formation of the isospecific centers
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