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Top: Synthesis of an end-labeled block copolymer. Left: 1H NMR spectra of 10 (bottom) and 12 (top). Percentile conversion (98%) was determined by integration of the mercaptoethanol methylene signal (red arrow) 12 against the alkene signal (blue arrow) of the polymer backbone. The guanidinium signals are not distinguishable from those of the norbornene signals of the polymer backbone.
