The end-group analysis for both PMMA telomers having a carboxyl end-group and macromonomers derived from these telomers was carried out using H-1 NMR. Telomers were prepared by telomerization of methyl methacrylate (MMA) with thioglycolic acid (TGA) initiated with 2,2' azobis(isobutyronitrile) (AIBN) in acetonitrile at 70 degreesC. Then, macromonomers were obtained by reaction of the telomer carboxylic acid end-group with glycidyl methacrylate (GMA) using a chromium salt as catalyst. From the H-1 NMR study, it was found that the telomer/macromonomer conversion results from two ways of epoxy addition (alpha and beta), as observed in a model reaction between GMA and octanoic acid (OA).