Complexes organonickel

Other Complexes. Several other classes of organonickel complexes are known. AHyl bromide and nickel carbonyl react to give a member of the TT-aHyl system [12012-90-7], [7T-C3H3NiBr]2 (100). Tris(r -ethene)nickel [50696-82-7] reacts with acetylene and l,2-bis(diisopropylphosphino)ethane to... 

The most important by-product formed in the reaction of pyridine with degassed Raney nickel is an organonickel complex which has been shown to be a complex of one molecule of 2,2 -bipyridine, two molecules of 2,2 -pyrrolylpyridine (17), and one nickel II ion. It is significant that, although the formation of 2,2 -bipyridine ceases after 50 hr refluxing, the formation of this complex continues for at least another 140 hr. 

Some of the factors which affect the relative yields of 2,2 -bipyri-dine and of the organonickel complex are known. For example, the addition of about 1% pyrrole to the pyridine during the reaction causes a 60% increase in the yield of the complex and a 13% decrease in the amount of 2,2 -bipyridine formed (see Table III). When more pyrrole is present the yields of both products are lowered, but the ratio of complex to 2,2 -bipyridine is increased by a factor of about 7. These findings suggest that pyrrole can be incorporated into the complex, presumably by reaction between pyrrole and pyridine to... 

B2) Metathetical exchange of a nickel(II(-bonded anionic ligand by an anion of a stronger Brdnsted acid. The nickel II) component can be either an organonickel complex or a nickel hydride. 

Synthetic Applications of Organonickel Complexes in Organic Chemistry, 17, 195... 

Nickel is frequently used in industrial homogeneous catalysis. Many carbon-carbon bond-formation reactions can be carried out with high selectivity when catalyzed by organonickel complexes. Such reactions include linear and cyclic oligomerization and polymerization reactions of monoenes and dienes, and hydrocyanation reactions [1], Many of the complexes that are active catalysts for oligomerization and isomerization reactions are supposed also to be active as hydrogenation catalysts. 

Oxalic acid, in hydrogen-bonded network templating, 12, 561 Oxamidinate, in <7-organonickel complexes, 8, 31 Oxanickelacycles, preparation, 8, 105... 

Perfluoro- rt,4 -phenylene mercury, as anion acceptor, 2, 451 Perfluoro- rt,4 -phenylenes, with mercury, 2, 456-457 Perfluorophenyl groups, in a-organonickel complexes, 8, 33 Perfluorophenyl ligation, and monomeric Cr(III) derivatives,... 

Indium (I) halides insert into nickel halogen bonds of carbonyl group free organonickel complexes to form Ni-In bond compounds, which can be viewed as derivatives of trimethylindium or indiumtrihalides. ... 

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