group, such as an alkenyl-containingcompound having a leaving group, e.g. halogen or acetyl, a carbonyl compound having an alkenyl group, an isocyanate compound having an alkenyl group or an acid halide having an alkenyl group. (A-f) The method which comprises reacting a vinyl polymerhaving at least one highly reactive carbon-halogen bond with an oxoanion or carboxylate anion having an alkenyl gr