Abstract
A simple method for the counting and structural elucidation of the different active sites in an olefin polymerization catalyst system is introduced, based on a reaction quench by O2 under controlled kinetics, followed by NMR analysis of the OH‐labeled chain end‐groups formed upon acidic work‐up of the polymer. The method is successfully benchmarked using a molecular bis(phenoxyamino)Zr(IV)‐based catalyst characterized by a comparatively long‐lasting controlled kinetic transient at room temperature. image
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