Catalysts for olefin polymerization

A process for the polymerization of olefins, comprising the step of contacting, at a temperature of about −100° C. to about +200° C., at least one polymerizable olefin with a compound of the formula (IV), (V) or (XIII)

• wherein:
• R1 and R2 are each independently hydrocarbyl, substituted hydrocarbyl or a functional group;
• Y is CR11R12, S(T), P(T)Q, NR36 or NR36NR36;
• X is O, CR5R6 or NR5;
• A is O, S, Se, N, P or As;
• Z is O, Se, N, P or As;
• each Q is independently hydrocarbyl or substituted hydrocarbyl;
• R3, R4, R5, R6, R11 and R12 are each independently hydrogen, hydrocarbyl, substituted hydrocarbyl or a functional group;
• R7 is hydrogen, hydrocarbyl, substituted hydrocarbyl or a functional group, provided that when Z is O or Se, R7 is not present;
• R8 and R9 are each independently hydrogen, hydrocarbyl, substituted hydrocarbyl or a functional group;
• R10 is hydrogen, hydrocarbyl, substituted hydrocarbyl or a functional group;
• each T is independently ═O or ═NR30;
• R30 is hydrogen, hydrocarbyl, substituted hydrocarbyl or a functional group;
• R31 and R32 are each independently hydrogen, hydrocarbyl, substituted hydrocarbyl or a functional group;
• R33 and R34 are each independently hydrocarbyl or substituted hydrocarbyl, provided that each is independently an aryl substituted in at least one position vicinal to the free bond of the aryl group, or each independently has an Es of −1.0 or less;
• R35 is hydrogen, hydrocarbyl, substituted hydrocarbyl or a functional group, provided that when A is O, S or Se, R35 is not present;
• each R36 is independently hydrogen, hydrocarbyl, substituted hydrocarbyl or a functional group;
• m is 0 or 1;
• s is 0 or 1;
• n is 0 or 1;
• and
• q is 0 or 1;
• M is a Group 3 through Group 11 transition metal or a lanthanide metal;
• and
• L1 is a monodentate monoanionic ligand into which an ethylene molecule may insert between L1 and M, and L2 is a monodentate neutral ligand which may be displaced by ethylene or an empty coordination site, or L1 and L2 taken together are a monoanionic bidentate ligand into which ethylene may insert between said monoanionic bidentate ligand and said nickel atom, and each L3 is independently a monoanionic ligand and z is the oxidation state of M minus 2;
• and provided that;
• any two of R3, R4, R5, R6, R8, R9, R11 and R12 bonded to the same carbon atom taken together may form a functional group;
• any two of R1, R2, R3, R4, R5, R6, R7, R8, R9, R11, R12, R31, R32, R33, R34, R35 and R35 bonded to the same atom or vicinal to one another taken together may form a ring;
• and
• when said compound is (IV), Y is C(O), Z is O, and R1 and R2 are each independently hydrocarbyl, then R1 and R2 are each independently an aryl substituted in one position vicinal to the free bond of the aryl group, or R1 and R2 each independently have an Es of −1.0 or less.