Acyclic diene metathesis

Source: Wikipedia, the free encyclopedia.

Acyclic diene metathesis or 'ADMET' (distinguish from

polymerize terminal dienes to polyenes
:

ADMET
ADMET

The new double bonds formed can be in

cis- or trans-configurations
. The exact ratio depends on the identities of the monomer and catalyst.

ADMET is a type of

ring-opening metathesis polymerization (ROMP), which is a chain-growth, addition polymerization.[1]
Whereas ADMET is driven by the release of volatile ethylene gas, ROMP is driven by the relief of ring-strain.

While the concept of ADMET had been discussed in the scientific literature since the 1970s, the first successful ADMET polymerization was reported in 1991.

weight average molar mass
(Mw) of 28,000 with over 70% trans double bonds. The poly(octenylene) had an Mw of 108,000 with over 90% trans double bonds.

ADMET has been applied in the synthesis of a variety of polymers. Because of the higher degree of control in ADMET than in traditional radical polymerizations, it has been used to synthesize model polymers that would otherwise be difficult to prepare. Examples include purely linear

supramolecular structures.[4]

References

  1. doi:10.1039/B924852H
    .
  2. doi:10.1021/ma00010a001
    .
  3. ISBN 978-3-540-23358-9
    .
  4. PMID 17131986
    .
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