Ethylene bis tricyclohexylphosphine nickel

Ni(C2H4)[P(C6H11)3]2 + A1(0C2H5)(C5H702)2 + C2H6 + C2H4 

The presence of a linear Ni—N—N—Ni system in this complex has been confirmed by an x-ray structural determination.2 A cryo- 

The nitrogen molecule is readily displaced from solutions of the complex by argon to give the co-ordinatively unsaturated bis-(tricyclohexylphosphine)nickel complex, Ni[P(C6H11)3]2 in solution. This complex readily undergoes a variety of co-ordinative-addition and co-ordinative-oxidation reactions.2,5 

The original reports related to RuH2(N2)[(C6H5)3P]3 concerned spectroscopic studies on nitrogen-saturated solutions of RuH2-[(C6H5)3P]4.1 It was evident that a nitrogen complex had formed, and it was speculated that this arose by the combination of molecular 

A three-necked 500-ml. flask is thoroughly dried, flushed with nitrogen, and fitted with a magnetic stirrer, a gas inlet tube, a serum stopper, and a condenser cooled with a Dry Ice-acetone mixture. Ether (300 ml.) and chlorohydridotris(triphenylphosphine)ruthenium (II)(toluene solvate,3 9.8 g., 9.7 mmoles) are placed in the flask. The gas inlet tube is adjusted so that it ends just above the surface of the stirred reaction mixture, and a moderate stream of nitrogen is passed through the tube. Triethylaluminum (8 ml.) is added in one portion by injection through the serum stopper, and the mixture is stirred for 4 hours. It may be necessary to add more ether if excessive evaporation occurs. 

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The olefin complexes of iron, nickel, rhodium, and iridium described in this chapter have found broad application in the synthesis of phosphine, phosphite, and carbonyl derivatives of these metals. In Chapter Two, the synthesis of another labile olefin complex, (ethylene)bis(tricyclohexylphosphine)nickel, is described as an initial step in synthesis of a complex of dinitrogen. 

Significant advances in organonickel chemistry followed the discovery of frtzws,fraws,fraws-(l,5,9-cyclododecatriene)nickel, Ni(cdt), and bis(l,5-cycloocta-diene)nickel Ni(cod)2 by Wilke et. al.1 In these and related compounds, in which only olefinic ligands are bonded to the nickel, the metal is especially reactive both in the synthesis of other compounds and in catalytic behavior. Extension of this chemistry to palladium and to platinum has hitherto been inhibited by the lack of convenient synthetic routes to zero-valent complexes of these metals in which mono- or diolefins are the only ligands. Here we described the synthesis of bis(l,5-cyclooctadiene)platinum, tris(ethylene)-platinum, and bis(ethylene)(tricyclohexylphosphine)platinum. The compound Pt(cod)2 (cod = 1,5-cyclooctadiene) was first reported by Muller and Goser,2 who prepared it by the following reaction sequence ... 

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