Bis! 1,5-cyclooctadiene nickel

Dibenzofuran is also formed when phenoxathiin is desulfurized by bis( 1,5-cyclooctadiene)nickel(O) and 2,2 -bipyridyl, but limited synthetic application can be envisaged for this type of reaction despite the high yield obtained (see Scheme 77).140... 

N-Benzyl-N-methoxymethyl-N-(tri-methylsilyl)methylamine, 31 Bis( 1,5-cyclooctadiene)nickel(0), 35 Lithium diisopropylamide, 163 N-Methyl-N, O-bis(trimethylsilyl) -hydroxylamine, 187 Titanium(IV) chloride-N-Methylani-line, 310... 

Bis[2,2 -bis(diphenylphosphine)-l,l -binaphthyl] (tetrachloro) (triethyl-amine) diruthenium, 36 Bis( 1,5-cyclooctadiene)nickel(0)-Di-ethylaluminum chloride-Threophos, 298... 

UNSATURATED KETONES Bis-< 1,5-cyclooctadiene)nickel(0). Dimethyl-(phenylthio)aluminum. a-Phenylglycine methyl ester. Phenylselenoacetaldchydc. Zinc-Silver couple. 

COUPLING OF ARYL AND ALKENYL HALIDES Bis-(1,5-cyclooctadiene)nickel(0). 

N,N-Bisbromomagnesiumaniline, 33 Bischler-Napieralski reaction, 394 Bis(2-chloroethyl)ether, 142 Bischloromethylation, 84 Bis(chloromethyl) ether, 83 Bis-(1,5-cyclooctadiene)nickel(0), 33-35 Bis(dibutylacetoxytin)oxide, 393,394... 

Louie et al. reported the nickel-catalyzed hetero-[2 + 2 + 2]-cycloaddition of CO2 with diynes. The reaction of the diynes 401 with CO2 under atmospheric pressures occurred in the presence of bis(1,5-cyclooctadiene) nickel and the 7V-heterocyclic carbene ligand (IPr, 403) to give the corresponding pyrones 402 in high yields (Scheme 128).189b... 

Intramolecular dicarborative addition of vinyl halides and cyanide is also catalyzed by bis(1.5-cyclooctadiene)nickel(O) to give ring systems with high trims diastereoselectivity 83. 

The classical methodology of the Ullmann biaryl synthesis was significantly improved by Semmelhack et al. using zero-valent nickel complexes [28]. Aryl iodides were coupled in high yield using bis(1,5-cyclooctadiene)nickel(0) as catalyst. Yields were further improved by the application of tetrakis(triphenylphosph-ine)nickel(0) [29] (Scheme 40). 

Isomerization of quadricyclone Quadricyclane (1) is isomerized mainly to norbornadiene (2) in the presence of a nickel(O) catalyst bis(acrylonitrile)-nickel(O) or bis( 1,5-cyclooctadiene)nickel(0). Evidence that a complex such as (a) is involved in the product-determining step is presented. For example, isomerization in the presence of acrylonitrile results in exo- and e do-isomers of the adduct (3). 

Bis( 1,5-cyclooctadiene)nickel(0) is useful for the synthesis of a variety of novel nickel complexes since the cyclooctadiene ligands are easily displaced. The procedure given here is based on that described by Wilke butadiene is used to prevent the formation of nickel metal. ... 

Bis( 1,5-cyclooctadiene) nickel (0 ) I tri-iQYi-butylphosphine 3,4>Fused pyran ring from diynes and aldehydes... 

Bis(1,5-CyclOOCtadiene)nickel(0). This complex can be used for the oligomerization of acetylene and the dimerization of dienes such as butadiene. It is prepared by the reaction of nickel(II) (2,4-pentanedionate) and triethylalu-minum with cyclooctadiene (7). 

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