Biaryl hydroxythiophene group iv transition metal polymerization catalysts with chain transfer capability

A catalyst system comprising:

• a metalligand complex according to formula (I):
• where:
• M is a metal chosen from titanium, zirconium, or hafnium, the metal having a formal oxidation state of +2, +3, or +4;
• each X is a monodentate or bidentate ligand independently chosen from unsaturated (C2C20)hydrocarbon, unsaturated (C2-C50)heterohydrocarbon, (C1-C50)hydrocarbyl, (C6-C50)aryl, (C6-C50)heteroaryl, cyclopentadienyl, substituted cyclopentadienyl, (C4-C12)diene, halogen, ORC, —N(RN)2, and —NCORC;
• each Y is oxygen, sulfur, or NRN;
• n is 1 or 2;
• each R1 is chosen from (C1-C50)hydrocarbyl, (C1-C50)heterohydrocarbyl, (C6-C50)aryl, (C4-C50)heteroaryl, Si(RC)3, Ge(RC)3, P(RP)2, N(RN)2, ORC, SRC, NO2, CN, CF3, RCS(O), P(O)(RP)2, RCS(O)2, (RC)2C═N, RCC(O)O, RCOC(O), RCC(O)N(R), (RC)2NC(O), halogen, and H, wherein each RN, RC, and RP is independently selected from the group consisting of (C1-C20)hydrocarbyl, (C1-C20)heterohydrocarbyl, and —H;
• Q is (C1-C12)alkylene, (C1-C12)heteroalkylene, (—CH2Si(RQ)2CH2—), (—CH2CH2Si(RQ)2CH2CH2—), (—CH2Ge(RQ)2CH2—), or (—CH2CH2Ge(RQ)2CH2CH2—), where RQ is (C1-C20)hydrocarbyl;
• each z1 and z2 is independently selected from the group consisting of sulfur, oxygen, —N(RC)—, and —C(RC)—, provided at least one of z1 and z2 in each individual ring containing groups z1 and z2 is sulfur;
• each R4a, R5a, R6a, and R7a is independently chosen from (C1-C50)hydrocarbyl, (C1-C50)heterohydrocarbyl, (C6-C50)aryl, (C4-C50)heteroaryl, —Si(RC)3, —Ge(RC)3, —P(RP)2, —N(RN)2, —ORC, —SRC, —NO2, —CN, —CF3, RCS(O)—, —P(O)(RP)2, RCS(O)2—, (RC)2C═N—, RCC(O)O—, RCOC(O)—, RCC(O)N(R)—, (RC)2NC(O)—, halogen, and —H, in which optionally R4a and R5a, or R5a and R6a, or R6a and R7a, may be covalently connected to form an aromatic ring or a non-aromatic ring;
• each RC, RN, and RP in formula (I) is independently selected from the group consisting of (C1-C20)hydrocarbyl, (C1-C20)heterohydrocarbyl, and —H;
• and
• a chain transfer agent.