392292-92-1

Upstream product

• 308359-86-6 2,6-bis[1-(2,6-diisopropylphenylimino)ethyl]pyridine cobalt(II) dichloride 
• 75-16-1 methylmagnesium bromide 
• 392292-96-5 [bis(2,6-diisopropylphenylimino-κN,N'-ethyl)pyridine-κN]CoCl 
• 917-54-4 methyllithium 
• 204203-14-5 N-(2,6-diisopropylphenyl)-N-((1E)-1-(6-[(1E)-N-(2,6-diisopropylphenyl)ethanimidoyl]pyridin-2-yl)ethylidene)amine 

Downstream Products

• 392292-95-4 [Co(η1-N2)(2,6-(MeCN(2,6-(CHMe2)2C6H3))2C5H3N)][MeB(C6F5)3] 
• 851915-26-9 [Co(C⁽²⁾H₃)(2,6-(MeCN(2,6-(CHMe₂)2C₆H₃))2C₅H₃N)] 
• 799274-23-0 [CoEt(2,6-(MeCN(2,6-(CHMe₂)2C₆H₃))2C₅H₃N)] 
• 799274-24-1 [Co(n-C₃H₇)(2,6-(MeCN(2,6-(CHMe₂)2C₆H₃))2C₅H₃N)] 
• 851915-24-7 [Co(CHCHC(CH₃)3)(CCC(CH₃)3)((2,6-(MeCN(2,6-(CHMe₂)2C₆H₃))2C₅H₃N)][MeB(C₆F₅)3] 
• 392292-98-7 [Co(η2-ethylene)(2,6-(MeCN(2,6-(CHMe2)2C6H3))2C5H3N)][MeB(C6F5)3] 
• 763104-47-8 [Co(2,6-bis(2,6-diisopropylphenyliminoethyl)pyridine)(H)] 
• 1334171-47-9 Co((N(C₆H₃(CH(CH₃)2)2)C(CH₃))2C₅H₃N)(CH₃)⁽¹⁺⁾*B(C₆H₃(CF₃)2)4^(1-)=[Co((N(C₆H₃(CH(CH₃)2)2)C(CH₃))2C₅H₃N)(CH₃)]B(C₈H₃F₆)4 
• 1334171-44-6 Co((N(C₆H₃(CH(CH₃)2)2)C(CH₃))2C₅H₃N)(CH₃)⁽¹⁺⁾*B(C₆H₅)4^(1-)=[Co((N(C₆H₃(CH(CH₃)2)2)C(CH₃))2C₅H₃N)(CH₃)]B(C₆H₅)4 

Relevant academic research and scientific papers

Chelate bis(imino)pyridine cobalt complexes: Synthesis, reduction, and evidence for the generation of ethene polymerization catalysts by Li+ cation activation

Treatment of the bis(iminobenzyl)pyridine chelate Schiff-base ligand 8 (ligPh) with FeCl2 or CoCl2 yielded the corresponding (ligPh)MCl2 complexes 9 (Fe) and 10 (Co). The reaction of 10 with methyllithium or "butadiene-magnesium" resulted in reduction to give the corresponding (ligPh)Co(I)Cl product 11. Similarly, the bis(aryliminoethyl)pyridine ligand (ligMe) was reacted with CoCl2 to yield (ligMe)CoCl2 (12). Reduction to (ligMe)CoCl (13) was effected by treatment with "butadiene-magnesium". Complex 13 reacted with Li[B(C 6F5)4] in toluene followed by treatment with pyridine to yield [(ligMe)Co+-pyridine] (15). The reaction of the Co(II) complexes 10 or 12 with ca. 3 molar equiv of methyllithium gave the cobalt(I) complexes 16 and 17, respectively. Treatment of the (lig Me)CoCH3 (17) with Li[B(C6F5) 4] gave a low activity ethene polymerization catalyst. Likewise, complex 16 produced polyethylene (activity = 33 g(PE) mmol(cat)-1 h-1 bar-1 at room temperature) upon treatment with a stoichiometric amount of Li[B(C6F5)4]. A third ligand (ligOMe) was synthesized featuring methoxy groups in the ligand backbone (22). Coordination to FeCl2 and CoCl2 yielded the desired compounds 23 and 24. Reaction with MeLi gave (lig OMe)CoMe (25/26). Treatment of 25/26 with excess B(C 6F5)3 gave the η6-arene cation complex 27, where one Co-N linkage was cleaved. Activation of 25/26 with Li[B(C6F5)4] again gave a catalytically active species.

Investigations into the mechanism of activation and initiation of ethylene polymerization by bis(imino)pyridine cobalt catalysts: Synthesis, structures, and deuterium labeling studies

The activation of bis(imino)pyridine cobalt(II) precatalysts by MAO leads initially to a bis(imino)pyridine cobalt(I) cationic species with no cobalt-C(alkyl) bond into which insertion can occur. Mechanistic studies have shown that the initiation of polym

Olefin polymerization with [{bis(imino)pyridyl}CoIICl2]: Generation of the active species involves CoI

Activated by reduction: On treatment with methylaluminoxane (MAO), the Brookhart/Gibson cobalt-based polymerization precatalyst [LCoIICl2] is first reduced to [LCoICl], subsequently alkylated to [LCoIMe], and finally converted into the (as yet unknown) active species (see scheme, PE=polyethene).

The nature of the active species in bis(imino)pyridyl cobalt ethylene polymerisation catalysts

Studies on cobalt ethylene polymerisation catalysts bearing bis(imino)pyridine ligands strongly indicate that the activated species is not the anticipated cobalt(II) alkyl cation.