AbstractCopolymerization of phenyl methacrylate,p‐tolyl methacrylate, andp‐chlorophenyl methacrylate with styrene was carried out in the absence and in the presence of ZnCl2. It was found by13C NMR,1H NMR, and IR spectroscopy that complexes of zinc chloride with the corresponding methacrylates are formed. Reactivity ratios as well asQandevalues for the monomers and complexes were calculated. A correlation betweenevalues and13C chemical shift of the vinyl group of monomers and complexes with ZnCl2was fo