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The potential use of conjugated polymers in device applications is often limited by their less than optimal physicochemical properties. This work describes an efficient protocol to end-cap conjugated polymers synthesized via palladium-catalyzed cross-coupling polymerizations with norbornene groups. Specifically, the hydroarylation of norbornadiene is shown to be a high-yielding end-capping method. These strained bicyclic alkenyl end groups can be transformed into macroinitiators via ring-opening metathesis polymerization and can polymerize other strained monomers, such as norbornene, yielding elastomeric triblock copolymers.United States. Army Research Office (Contract W911NF-07-D-004)United States. Air Force Office of Scientific Research (FA9550-10-1-0395

Norbornadiene End-Capping of Cross-Coupling Polymerizations: A Facile Route to Triblock Polymers