Bis cobaltate

X-ray, 7, 356 (73JA4647) l,2-Azaborol-5-ide)cobalt, bis(l,2,3-trihydro-2-methyl-1 -trimethylsilyl-X-ray, 1, 634 (82CB732)... 

Cobalt, bis(dimethy glyoxime)isocyano-, 1, 186 Cobalt, bis(l,2-ethanediamine)bis(isothiocyanato)-chloride... 

In 1989, Isayama and Mukaiyama reported a related Co-catalyzed coupling reaction that employs a,b-unsaturated nitriles, amides, and esters with PhSiLb as a hydrogen source [9]. Cobalt-bis(diketonato) complex, Co(II)(dpm)2 [dpm = bis(dipivaloylmethanato)] (5mol%), exhibited high catalytic activity at 20 °C in the coupling of excess acrylonitrile and ben-zaldehyde to provide b-hydroxy nitrile 4 in 93% yield (syn anti = 50 50) (Scheme 5). N,N-Dimethylacrylamide and methyl cinnamate both reacted... 

Recently it was found that similarly benzyl ic and allylic chlorides can be carboxylated using a cobalt-bis-salicylidene iminato complex (Co(salen)) (Table 6, No. 8)... 

The more cationic halogen containing compounds produced other products. Cobalt bis-allyliodide produced cis-polybutadiene and the even more cationic chromium, produced cyclododecatriene. Only with the more cationic system which introduced trans-structures, was cyclization and reduction of the metal able to intercept the polymerization reaction. Cyclization was not possible in the less cationic cobalt which produces all cis-polybutadiene nor was the hydride transfer possible with the less anionic chromium tris-allyl compound. 

Cobalt( )bis(diethylenetriamine) Perchlorate or Bis(diethylenetriamine)Cobaltic Perchlorate,... 

The most common hydrox y oxime ligands are salicylaldoximes, complexes of which with copper(II), nickel(II) amd palladium(II), cobalt(II), iron(II), iron(HI) and manganese(II) have been investigated extensively including crystal and molecular structures13 of the first three. In an interesting study,71 the reactions of cobalt bis chelates of this type have been studied with aluminum isopropoxide. 

Et2AlCl could be replaced by the sesquichloride or by a mixture of a trialkylaluminum and a reactive halide such as benzyl chloride or tert-butyl chloride. The effective cobalt compounds were those which are known to yield cis-1,4-polybutadiene—e.g. cobalt stearate, cobalt acetyl-acetonate, cobalt bis(salicylaldehyde imine), cobalt chloride-pyridine, etc. Et2AlCl concentration could be varied within the range 0.3-5% by weight based on PVC, and the cobalt compound concentration was 0.002-0.01 mole per mole of Et2AlCl. 

Griiner, B., Plesek, J., Baca, J. et al. 2002. Crown ether substituted cobalt bis(dicarbollide) ions as selective extraction agents for removal of Cs + and Sr2 + from nuclear waste. New J. Chem. 26 (7) 867-875. 

Reinoso-Garcra, M.M., Verboom, W., Reinhoudt, D.N., Brisach, R, Arnaud-Neu, R, Liger, K. Solvent extraction of actinides and lanthanides by CMP(O)- and N-acyl(thio) urea-tetrafunctionalized cavitands Strong synergistic effect of cobalt bis(dicarbollide) ions. Solvent Extr. Ion Exch. (2005), 23 (3), 425-437. 

Redox potentials for a group of selected bis(dithiolene) complexes are listed in Table II. Neutral iron and cobalt bis(dithiolene) complexes exist in the dimeric form. The dimers stay intact when partially reduced and dissociate into monomers when fully reduced (34, 35). The potentials listed in Table II for Fe and Co complexes are therefore for the redox couples (0/—1, — 1/—2, etc.) of the dimer (Eq. 2). 

The sample studied was a cobalt bis(phosphonate) of composition C02(O3PC6H4OC6H4PO3)-2H2O. It is one of the series of first row transition element compounds with the same general formula, but different water contents. The Cu(ll) compound structure was solved from its powder pattern, unit cell dimensions a = 8 1012(5), b = 5.3109(3), c = 29.2595(5) A. It has a layered structure in which the layers are spaced at half the c-axis dimension. The reason for the doubling of the c-axis is that in one layer the rings are tilted around the ether oxygen to the left and in the next layer to the right. The Cu atoms are 5-coordinate with square pyramidal structure. 

Cobalt Bis-[trimethoxyphosphan]-(t) 5-cyclopentadienyl)-methyl-(Iodid) XlII/9b, 92... 

Jonas and Tadic [71] have investigated the homogeneous cobalt-catalyzed co-cyclotrimerization of acetylene and olefins. The reaction with -Ind-cobalt bis(ethylene) as the catalyst was carried out with ethylene, a-olefins and 2-butene as well as cyclohexene and cyclooctene (eq. (25)). 

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