Ring Opening Metathesis Polymerization without Metals

  • Author: Mary Collins
  • Published: 19 February 2015
  • Copyright: Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
  • Source / Publisher: Journal of the American Chemical Society/ACS Publications
  • Associated Societies: American Chemical Society (ACS), USA
thumbnail image: Ring Opening Metathesis Polymerization without Metals

Ring-opening metathesis polymerization (ROMP) is typically a transition metal activated polymerization method using cyclic olefins, which are joined together to form a polymer chain. However, metal byproducts lead to complications with measurements using electronic or optical properties. Residual metallic species also compromise biological studies and lead to unwanted oxidative processes.

Andrew J. Boydston and colleagues at the University of Washington, Seattle, USA, have developed a transition-metal free alternative to ROMP that uses a one-electron oxidation of a vinyl-ether initiator. The direct oxidation of the vinyl ether generates a radical cation, which reacts with a cycloalkene monomer giving a [2+2] complex. The complex rapidly ring-opens to alleviate ring strain, and propagation with additional monomers yields ROMP polymers.

The researchers investigated the propensity of vinyl ethers to activate ROMP both electrochemically and via photoredox initiation using a norbornene monomer. Photo-oxidation gives high yields of polymer under mild conditions as well as temporal control over reinitiation of polymer growth during on/off cycles of blue LED light.


Article Views: 2585

Sign in Area

Please sign in below

Additional Sign In options

Please note that to comment on an article you must be registered and logged in.
Registration is for free, you may already be registered to receive, e.g., the newsletter. When you register on this website, please ensure you view our terms and conditions. All comments are subject to moderation.

Article Comments - To add a comment please sign in

Bookmark and Share

If you would like to reuse any content, in print or online, from ChemistryViews.org, please contact us first for permission. more


ChemistryViews.org on Facebook

ChemistryViews.org on Twitter ChemistryViews.org on YouTube ChemistryViews.org on LinkedIn Sign up for our free newsletter

A product of ChemPubSoc Europe (16 European Chemical Societies)and Wiley-VCH