1364955-53-2

Upstream product

• 914225-37-9 C₁₂H₁₇BrO₂ 
• 1425932-95-1 C₃₄H₄₆O₄ 
• 1425932-98-4 C₃₆H₄₆O₆ 
• 41280-65-3 2-bromo-4-tert-butylanisole 
• 1646-54-4 1,4-dibromodurene 
• 1364955-48-5 C₃₂H₄₀Br₂O₂ 
• 1364808-70-7 C₃₂H₄₂O₂ 
• 24544-04-5 2,6-diisopropylbenzenamine 
• 1364955-52-1 C₃₂H₃₈O₄ 
• 1364955-50-9 C₃₄H₄₂O₄ 

Downstream Products

• 1425374-50-0 C₆₄H₉₄N₂Ni₂O₂P₂ 
• 1425374-50-0 C₆₄H₉₄N₂Ni₂O₂P₂ 
• 1354790-44-5 (C₆(CH₃)4(C₆H₂(C(CH₃)3)(O)CHNC₆H₃(CH(CH₃)2)2)2)Ni₂(NC₅H₅)2(CH₃)2 
• 1425374-50-0 C₆₄H₉₄N₂Ni₂O₂P₂ 

Relevant academic research and scientific papers

Bimetallic coordination insertion polymerization of unprotected polar monomers: Copolymerization of amino olefins and ethylene by dinickel bisphenoxyiminato catalysts

Dinickel bisphenoxyiminato complexes based on highly substituted p- and m-terphenyl backbones were synthesized, and the corresponding atropisomers were isolated. In the presence of a phosphine scavenger, Ni(COD)2, the phosphine-ligated syn-dinickel complexes copolymerized α-olefins and ethylene in the presence of amines to afford 0.2-1.3% α-olefin incorporation and copolymerized amino olefins and ethylene with a similar range of incorporation (0.1-0.8%). The present rigid catalysts provide a bimetallic strategy for insertion polymerization of polar monomers without masking of the heteroatom group. The effects of the catalyst structure on the reactivity were studied by comparisons of the syn and anti atropisomers and the p- and m-terphenyl systems.

MULTI-METALLIC ORGANOMETALLIC COMPLEXES, AND RELATED POLYMERS, COMPOSITIONS, METHODS AND SYSTEMS

Multi-metallic organometallic complexes that allow performance of olefin based reaction and in particular polymerization of olefins to produce polyolefin polymers, and related methods and systems are described.

Dinickel bisphenoxyiminato complexes for the polymerization of ethylene and α-olefins

Dinuclear nickel phenoxyiminato olefin polymerization catalysts based on rigid p-terphenyl frameworks are reported. Permethylation of the central arene of the terphenyl unit and oxygen substitution of the peripheral rings ortho to the aryl-aryl linkages blocks rotation around these linkages, allowing atropisomers of the ligand to be isolated. The corresponding syn and anti dinickel complexes (25-s and 25-a) were synthesized and characterized by single-crystal X-ray diffraction. These frameworks limit the relative movement of the metal centers, restricting the metal-metal distance. Kinetics studies of isomerization of a ligand precursor (7-a) allowed the calculation of the activation parameters for the isomerization process (ΔH = 28.0 ± 0.4 kcal × mol-1 and ΔS = -12.3 ± 0.4 cal mol -1 K-1). The reported nickel complexes are active for ethylene polymerization (TOF up to 3700 (mol C2H4) (mol Ni)-1 h-1) and ethylene/α-olefin copolymerization. Only methyl branches are observed in the polymerization of ethylene, while α-olefins are incorporated without apparent chain walking. These catalysts are active in the presence of polar additives and in neat tetrahydrofuran. The syn and anti isomers differ in polymerization activity, polymer branching, and polymer molecular weight. For comparison, a series of mononuclear nickel complexes (26, 27-s, 27-a, 28, 30) was prepared and studied. The effects of structure and catalyst nuclearity on reactivity are discussed.