to 20 representative substituents are trifluoromethyl u2014 c 4 f 9 u2014 c 10 f 2 and u2014 c 20 f 41 accordingly 2 vinyl 2 norbornene can be polymerized to produce poly 2 vinyl 2 norbornene the halogenated norbornene functional monomers can be synthesized via the diels alder reaction of cyclopentadiene with the appropriate halogenated dieneophile as shown in the following reaction schemes wherein r u2032 independently represents hydrogen or f and n is an integer from 1 to 20 some further examples of norbornene functional monomers that can be polymerized with the catalyst systems of this invention include those of the structural formula some representative examples of norbornene type monomers that can be polymerized with the catalyst systems of this invention include but are not limited to following norbornene bicyclo 2 2 1 hept 2 ene 5 ethylidenenorbornene dicyclopentadiene tricyclo 5 2 1 0 2 6 deca 8 ene 5 methoxycarbonylbicyclo 2 2 1 hept 2 ene 5 methylbicyclo 2 2 1 hept 2 ene 5 carboxylic acid 5 methylbicyclo 2 2 1 hept 2 ene 5 ethylbicyclo 2 2 1 hept 2 ene 5 ethoxycarbonylbicyclo 2 2 1 hept 2 ene 5 n propoxycarbonylbicyclo 2 2 1 hept 2 ene 5 i propoxycarbonylbicyclo 2 2 1 hept 2 ene 5 n butoxycarbonylbicyclo 2 2 1 hept 2 ene 5 2 methylpropoxy carbonylbicyclo 2 2 1 hept 2 ene 5 1 methylpropoxy carbonylbicyclo 2 2 1 hept 2 ene 5 t butoxycarbonylbicyclo 2 2 1 hept 2 ene 5 cyclohexyloxycarbonylbicyclo 2 2 1 hept 2 ene 5 4 u2032 t butylcyclohexyloxy carbonylbicyclo 2 2 1 hept 2 ene 5 phenoxycarbonylbicyclo 2 2 hept 2 ene 5 tetrahydrofuranyloxycarbonylbicyclo 2 2 1 hept 2 ene 5 tetrahydropyranyloxycarbonylbicyclo 2 2 1 hept 2 ene.