Nickel acetylide

Nickel Acetylide [Nickel (II)- acetyl enid, in Ger), NiC2 solid, stable at RT in air or w. Was prepd by treating CaQ with an aq soln of NiCla(Refs 1 2). It was proposed as a catalyst in some org syntheses (Ref 3)... 

Needle Shell. See Arrow Projectile A488-R NENA. See 1-Nitramino-2-ethanol Nitrate under Aminoethanol A201-L Nickel Acetylide and Nickel Carbide A78-R Nickel Diazide A592-R Nickel Nitroaminoguanidine A213-R Nitramide or Nitroxylamide A170-L... 

Bis(dimethylthallium) acetylide Tetracarbonyl nickel Digold trisulphide Dichlorodiethylsilane... 

Butyne-l,4-diol and propargylalcohol are produced by reaction between formaldehyde in aqueous solution and gaseous acetylene in the presence of a copper acetylide catalyst supported on nickel. The process is carried out by trickle-flow operation (BIO, S4). 

Organometallic complexes of copper, nickel, and palladium have been used in indole syntheses from arenes. Most of the reactions proceed under relatively mild conditions and in some cases give rise to formation of the less common 2-substituted compounds.68 Good yields of such 2-substituted derivatives are formed in reactions of o-iodoarylamines with cuprous acetylides in dimethylformamide (Scheme 41 ).69 The efficiency of this type of... 

The compound in which the 3-keto group is reduced to a hydrocarbon interestingly still acts as an orally active progestin. The preparation of this compound starts with the hydrolysis of dihydrobenzene (13-2) to afford 19-nortestosterone (15-1). Reaction with ethane-1,2-thiol in the presence of catalytic acid leads to the cyclic thioacetal (15-2). Treatment of this intermediate with Raney nickel in the presence of alcohol leads to the reduced desulfurized derivative (15-3). The alcohol at 17 is then oxidized by any of several methods, such as chromic acid in acetone (Jones reagent), and the resulting ketone (15-4) treated with hthium acetylide. There is thus obtained the progestin lynestrol (15-5) [18]. 

The only apparently mononuclear complex of nickel(I) so far discovered is K3Ni(CN)4 (187). It is an extremely reactive substance obtained by reduction of K2Ni(CN)4 in strongly alkaline solution it has a magnetic moment of 1.73 B.M., which is the value expected for one unpaired electron. This compound may be compared with the complex acetylides prepared by... 

Nast (183), which have empirical formulas K3Ni(C2R)4 (It = H, CH3, or CsHs), They are diamagnetic, however, and must therefore be formulated as binuclear, i.e., K6[Ni2(C2R)8]. The fact that acetylides and cyanide have very similar properties as ligands (183) indicates that the factors governing the dimerization of nickel(I) complexes must be very subtle indeed. 

In the acetylide polymers of square planar nickel, palladium, and platinum listed in Table X, the imaginary part of the nonlinearity is the major contributor, implying significant two-photon absorption. Some of the poly-... 

MICHAEL ADDITIONS Alumina. Aluminum chloride. Cesium fluoride-Silicon(lV) cthoxidc. 1,4-Diazabicyclo[2.2.2]octanc. l,8-Diazabicyclo[5.4.0]-7-undecene. Ketene r-butyldimethylsilyl methyl acetal. Lithium acetylides. (S)-( + )-2-Mcthoxymethylpyrrolidine. Methyl lithiodithioacetate. Methyl (phcnylsulfinyl)acetate. Methyl 2-trimcthylsilylacrylate. Nickel carbonyl. Organocopper reagents. 8-Phenylmcnthol. Phenyl 2-(trimethylsilyl)ethynyl sulfone. Tetra-n-butylammonium fluoride. Tiianium(IV) chloride. 3-Triisopropylsilylpropynyllithiuni. Zirconium(IV) n-propoxiilc... 

Hydrothermal methods, for molecuarlar precursor transformation to materials, 12, 47 Hydrotris(3,5-diisopropylpyrazolyl)borate-containing acetylide, in iron complex, 6, 108 Hydrotris(3,5-dimethylpyrazolyl)borate groups, in rhodium Cp complexes, 7, 151 Hydrotris(pyrazolyl)borates in cobalt(II) complexes, 7, 16 for cobalt(II) complexes, 7, 16 in rhodium Cp complexes, 7, 151 Hydrovinylation, with transition metal catalysts, 10, 318 Hydroxides, info nickel complexes, 8, 59-60 Hydroxo complexes, with bis-Cp Ti(IV), 4, 586 Hydroxyalkenyl complexes, mononuclear Ru and Os compounds, 6, 404-405 a-Hydroxyalkylstannanes, preparation, 3, 822 y-Hydroxyalkynecarboxylate, isomerization, 10, 98 Hydroxyalkynes, in hexaruthenium carbido clusters, 6, 1015 a-Hydroxyallenes... 

With metals, such as copper (Cu) nickel (Ni), when moist, also lead (Pb) or zinc (Zn), when moist and unpurified tin (Sn) is not attacked but sodium yields, upon heating, sodium acetylide (CH CNa) and disodium... 

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