Note: Lu Rn=CH2 is a simplified drawing of the Ruthenium Grubbs catalyst.
Ring-opening metathesis polymerization (ROMP): Ring opening of strained cyclic olefin to give open chain metal carbene provides driving force for ROM.
A general mechanism for the ROMP can be seen below: Ring Opening Metathesis requires a strained ring to proceed. An example reaction of a ROMP reaction can be seen below: The Grubbs and Schrock catalysts were developed independently in the 1990s.
However, the involvement of alkenes containing a nitrogen atom such as an amine or an N-heteroaromatic ring in metathesis reactions is still problematic and have been the subject of several research works [21-26].
Lewis basic and nucleophilic amines are supposed to interfere with the catalyst and/or intermediates, thus disrupting the catalytic cycle and preventing the process to occur (vide infra).
A general mechanism for the RCM can be seen below: Ring closing metathesis requires the ring formed not to be strained.
Grubbs Metathesis Ring Closing The Outsiders Sociology Essay