We report herein a simple, efficient strategy to access
diverse
end-functionalized polymers from a living ring-opening metathesis
polymerization process using diazoacetates as a new terminating agent.
Such a terminating process occurs via a CC bond-forming reaction
between the chain-end ruthenium carbenes and the diazoacetates, resulting
in the rapid construction of a unique, α,β-unsaturated
carbonyl motif at more than 95% of the chain end within 5 min. A variety
of easily accessible and diversely substituted diazoacetates could
be used, allowing for the facile introduction of an additional panel
of useful functionalities at the polymer chain end. Diverse postpolymerization
modifications, including Michael addition, “click” reaction,
and chain extension, have been further demonstrated.
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