A polymerization process comprising contacting a cyclic olefin monomer and optional comonomer selected from C 2 to C 20 alpha olefins with a catalyst system comprising an activator and a catalyst compound represented by the Formula: wherein: M is Hf, Zr or Ti; E and E' are each O; each L is independently a Lewis base; each X is independently an anionic ligand; n is 1, 2 or 3; m is 0, 1, or 2; n+m is not greater than 4; R 1 and R 1' are independently a C 4 -C 40 tertiary hydrocarbyl group, a C 4 -C 40 cyclic tertiary hydrocarbyl group, or a C 4 -C 40 polycyclic tertiary hydrocarbyl group, each of R 2, R 3, R 4, R 2', R 3', and R 4 ' is independently hydrogen, C 1 -C 40 hydrocarbyl, C 1 -C 40 substituted hydrocarbyl, a heteroatom or a heteroatom-containing group, or one or more of R 2 and R 3, R 3 and R 4, R 2 ' and R 3', R 3' and R 4' may be joined to form one or more substituted hydrocarbyl rings, unsubstituted hydrocarbyl rings, substituted heterocyclic rings, or unsubstituted heterocyclic rings each having 5, 6, 7, or 8 ring atoms, and where substitutions on the ring can join to form additional rings; any two L groups may be joined together to form a bidentate Lewis base; an X group may be joined to an L group to form a monoanionic bidentate group; any two X groups may be joined together to form a dianionic ligand group; each of R 5, R 6, R 7, R 8, R 5', R 6', R 7 ', R 8', R 10, R 11, and R 12 is independently hydrogen, a C 1 -C 40 hydrocarbyl, a C 1 -C 40 substituted hydrocarbyl, a heteroatom or a heteroatom-containing group, or one or more of R 5 and R 6, R 6 and R 7, R 7 and R 8, R 5' and R 6', R 6' and R 7 ', R 7 ' and R 8', R 10 and R 11, or R 11 and R 12 may be joined to form one or more substituted hydrocarbyl rings, unsubstituted hydrocarbyl rings, substituted heterocyclic rings, or unsubstituted heterocyclic rings each having 5, 6, 7, or 8 ring atoms, and where substitutions on the ring can join to form additional rings. M is Hf, Zr or Ti; E and E' are each O; each L is independently a Lewis base; each X is independently an anionic ligand; n is 1, 2 or 3; m is 0, 1, or 2; n+m is not greater than 4; R 1 and R 1' are independently a C 4 -C 40 tertiary hydrocarbyl group, a C 4 -C 40 cyclic tertiary hydrocarbyl group, or a C 4 -C 40 polycyclic tertiary hydrocarbyl group, each of R 2, R 3, R 4, R 2', R 3', and R 4 ' is independently hydrogen, C 1 -C 40 hydrocarbyl, C 1 -C 40 substituted hydrocarbyl, a heteroatom or a heteroatom-containing group, or one or more of R 2 and R 3, R 3 and R 4, R 2 ' and R 3', R 3' and R 4' may be joined to form one or more substituted hydrocarbyl rings, unsubstituted hydrocarbyl rings, substituted heterocyclic rings, or unsubstituted heterocyclic rings each having 5, 6, 7, or 8 ring atoms, and where substitutions on the ring can join to form additional rings; any two L groups may be joined together to form a bidentate Lewis base; an X group may be joined to an L group to form a monoanionic bidentate group; any two X groups may be joined together to form a dianionic ligand group; each of R 5, R 6, R 7, R 8, R 5', R 6', R 7 ', R 8', R 10, R 11, and R 12 is independently hydrogen, a C 1 -C 40 hydrocarbyl, a C 1 -C 40 substituted hydrocarbyl, a heteroatom or a heteroatom-containing group, or one or more of R 5 and R 6, R 6 and R 7, R 7 and R 8, R 5' and R 6', R 6' and R 7 ', R 7 ' and R 8', R 10 and R 11, or R 11 and R 12 may be joined to form one or more substituted hydrocarbyl rings, unsubstituted hydrocarbyl rings, substituted heterocyclic rings, or unsubstituted heterocyclic rings each having 5, 6, 7, or 8 ring atoms, and where substitutions on the ring can join to form additional rings.