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