Ring opening metathesis monomer synthesis

As in the case of the ring-opening metathesis polymerisation of cycloolefins, an important matter is the control of polymerisation to prepare acetylenic polymers having precise structures. A living polymerisation is of practical importance in the synthesis of monodisperse polymers, such as terminally functionalised polymers and block copolymers. The metathesis catalysts that promote the living polymerisation of acetylene [42] and acetylenic monomers include M0OCI4 SnBu EtOFkNbCls and Ta, Mo and W alkylidenes [84, 133, 152, 153]. 

Ring opening metathesis polymerization, which has been known since the discovery of the alkene metathesis reaction, has been given the acronym ROMP in recent years. In fact, the ROMP reaction was the first observation made in alkene metathesis chemistry, while the discovery of the exchange reaction in equation (1) actually occurred later. Acychc diene metathesis (ADMET) polymerization (equation 3) has only recently been shown to be a viable method for polymer synthesis, and it has been termed ADMET polymerization. ROMP reactions are driven by the release of ring strain from the monomer, while ADMET polymerization is driven by a shift in the equilibrium caused by the removal of one of the reaction products. 

Okoroanyanwu, T. Shimokawa, J.D. Byers, and C.G. WiUson, AUcyclic pol3Tners for 193 nm resist applications synthesis and characterization, Chem. Mater. 10(11), 3319 3327 (1998) U. Okoroanyanwu, J.D. Byers, T. Shimokawa, and C.G. Willson, AUcyclic pol3uners for 193 nm resist appUcations Uthographic evaluation, Chem. Mater. 10(11), 3328 3333 (1998) U. Okoroanyanwu, T. Shimokawa, J.D. Byers, and C.G. Willson, Pd(II) catalyzed addition and ring opening metathesis polymerization of aUcyclic monomers routes to new matrix resins for... 

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