Nickel 2-ethylhexanoate catalyst

CH3(CH2)3CH(C2H5)C02)2Ni)/ tadiene-isoprene Catalyst (nickel-2-ethylhexanoate/triethyl (Houston, USA) 19 (1991)... 

A Ni based catalyst for addition polymerization can be prepared from nickel(2-ethylhexanoate), methylaluminoxane, and triethyl-borane (34). The polymerization is carried out in toluene as a solvent under pressure. 

Ziegler catalysts prepared from nickel or cobalt 2-ethylhexanoate and triethylaluminum (3 or 4 1 ratio) are very efficient for the hydrogenation of aromatic compounds.o-Xylene (51) gives a mixture of cis- (52) and trans-1,2-dimethylcyclohexane (53) in 65 35 ratio. Phenol (54), dimethyl phthalate and dimethyl terephthalate are also reduced in high yield, while nitro-substituted benzene and phenols cannot be reduced. Catalytic activity toward benzene hydrogenation decreases in the order Ni > Co > Fe > Cr > Cu. ... 

Lapporte and Schuett prepared a catalyst which is extremely effective for the hydrogenation of aromatics by adding triethylaluminum to a solution of nickel (II) 2-ethylhexanoate in benzene or heptane. An exothermic reaction occurred with evolution of a gas which is greater than 95% ethane and production of a black, nonpyrophoric solution of a catalytically active complex. 

The PNBs from all of these Ni-based catalysts are soluble in common organic solvents such as toluene or hexane, and resemble PNBs produced using Ni(acac)2 (acac = acetylacetonate) or di(2-ethylhexanoate)nickel in combination with MAO. Goodall and coworkers describe the structure of PNB formed using [(ti -crotyl)Ni(l,4-COD)]+[PF6] as containing almost equal amounts of mm and mr triads. 

BF Goodrich s patents US 5,569,730 (29 Oct 1996) and US 5,571,881 (5 Nov 1996) further erode the mystique of metallocene catalysts in making specially polyolefins, specifically for norbornene-functional monomers. Unique catalyst systems that catalyze the insertion of chain-transfer agents exclusively at a terminal end of a polymer chain are used to produce addition polymers from norbornene-functional monomers. These catalyst systems, in common with DuPont s, are based on nickel or palladium. There are two noteworthy factors firstly, the nickel or palladium can be present as simple compounds such as the bromides, oxides, acetylacetonates, or 2-ethylhexanoates secondly, and perhaps more surprisingly, these catalysts are activated by the same activators as are the metallocenes. 

Similar active species based on di(2-ethylhexanoate)nickel, BF3 -Et20, and AlEt3 in a 1 9 10 ratio forms, in the presence of butadiene, a catalyst precursor that may be activated by HSbFe to yield a cationic active species for norbornene... 

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