Abstract
AbstractThe use of stable metal‐carbene complexes to initiate the polymerization of norbornene allows to know the exact nature of active centers propagating the polymerization. Complexes showing an intramolecular coordination of a double‐bond on the transition metal atommagnified imageoffer a satisfactory compromise between stability and activity and are used to study the initiation step. It is shown that the kinetically limiting step of the process is the liberation of a coordination site in cis‐position with respect to the carbene carbon. The effect of several physical and chemical factors on the activity of initiator complex is studied. In particular, the mechanism of activation by Lewis acids is analyzed by 13C and 1H NMR on the system complex III/Al(C2H5)3.
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