Nickel methyl

Ni(acac)2] reacts with Me3Al and P(cyclohexyl)3 under nitrogen to give [ cyclohexyl)3P 2Ni2N2], the structure of which has been determined. The Ni—N—N—Ni system is linear with an N—N bond length of 1.12 A. Intermediate nickel-methyl compounds can be isolated from the reaction and the... 

Reduction of derivatives of ally lie alcohols. Nickel boride can effect reduction of allylic alcohols to alkenes, but yields are generally improved by reduction of the acetates, benzoates, or trifluoroacetates.1 Reduction of allylic benzyl ethers to alkenes is effected in higher yield with Raney nickel. Methyl ethers are not reduced by either reagent. The trimethylsilyl ethers of allylic alcohols are reduced to alkenes by nickel boride in diglyme.2... 

The products formed by the co-oligomerization of acrylic esters with butadiene (102,106) provide useful information concerning the nature and configuration of the intermediates involved. Naked-nickel, methyl acrylate, and butadiene do not react together.7 However, reaction does occur if the nickel-ligand system is used. The formation of the Diels-Alder adduct between the diene and olefin (a cyclohexene derivative) can be suppressed by adding the reactants dropwise to the catalyst (Table XVI footnote C). 

A bridging methyl group may also show a large shift to high field. In the case of the ( 3-l,3-dimethylallyl)nickel methyl dimer (14), the structure of which has been confirmed by X-ray crystallography (26), the bridging methyl groups resonate at —20.3 ppm [ J(CH) = 118 Hz]. 

There is spectroscopic evidence for nickel-methyl complexes in CODH of anaerobic bacteria. Here the nickel center is linked to an Fe4S4 cubane cluster it is this, not Ni, which appears to act as the binding site for CO. In a subsequent step the methyl ligand is then transferred from Ni to the coordinated CO to generate the acetyl function of acetyl coenzyme A.28... 

Copolymerization of ethene with norbomene and functionalized norbomenes in both non-aqueous and aqueous solutions could be carried out by (salicylaldimino) nickel methyl complexes [114,123-125], square-planar nickel complexes containing anionic P,0-chelates [126], and by Pd phosphine aryl sulfonates [127-129]. 

Gmbbs introduced (salicylaldimino)nickel methyl com-plexes " that yield linear polyethene with high molar masses. These catalysts operate without requirement of a cocatalyst and allow the incorporation of bulky cycloolefins as norbornene as well as functionalities into polyethene. Copolymerization of ethene with norbornene in both nonaqueous " and aqueous solutions could be carried out by (salicylaldimino)nickel methyl complexes. 

---