The present disclosure relates to amido-benzoquinone transition metal complexes, catalyst systems including amido-benzoquinone transition metal complexes, and polymerization processes to produce polyolefin polymers such as polyethylene-based polymers and polypropylene-based polymers.

The present disclosure relates to amido-benzoquinone transition metal complexes, catalyst systems including amido-benzoquinone transition metal complexes, and polymerization processes to produce polyolefin polymers such as polyethylene-based polymers and polypropylene-based polymers.

The present invention is directed to a synthetic polyisoprene which comprises isoprene repeat units comprising 1,4 isoprene repeat units and 3,4 isoprene repeat units. At least 5% of all isoprene repeat units of the synthetic polyisoprene are 3,4 isoprene repeat units and at least 96% of all 1,4 isoprene repeat units of the synthetic polyisoprene are cis 1,4 isoprene units. Moreover, the invention is directed to a method of synthesizing such a polyisoprene and a rubber composition comprising the synthetic polyisoprene.

Group 4 transition metal complexes of bidentate iminonaphthol pro-ligands can be used as catalysts to polymerize olefins, such as ethylene. Group 4 transition metal complexes of bidentate iminonaphthol pro-ligands can have a single-site nature, allowing the catalysts to be used to prepare ultra high molecular weight polyethylene having a narrow molecular weight distribution.