The transformation of enynes under cobalt-catalysis leads to symmetrical benzannulation products in dichloromethane. In tetrahydrofuran the cobalt-catalysed reactions afforded the unprecedented unsymmetrical benzannulation products in moderate to good yields and good regioselectivities. In addition, cyclotrimerisation of the alkyne subunit can be realised when electron-deficient enynes are appl...

Highly reactive tris-carbene Co(I) complexes [(TIMENaryl)Co]Cl react with organic azides to yield monomeric Co(III) imido complexes [(TIMENaryl)Co(NAr')](BPh4) (aryl = mes, xyl; Ar = -C6H4-CH3, -C6H4-OCH3). The cobalt-imido fragment in these complexes is electrophilic and, as a result, the imido group readily inserts into the cobalt-carbene bond, yielding bis-carbene imine cobalt complexes.

Abstract: the competition between the precipitation of cobalt ions and evolution of hydrogen gas on the cathode surface duringthe reduction process in a sulfate bath, investigation on the mechanism of metal precipitation is of great importance.In the present work, study on the kinetics of cobalt electrowinning and the mechanism of the involved reactions havebeen carried out. The obtained result...

Polyaniline-cobalt nanocomposites were synthesized bysalt of cobalt with ammonium persulphate as an oxidizing agent and aniline.This paper reports on hydrothermal technique using for synthesis and size control of cobalt nanoparticles in the composite bridge is aniline. Electrical conductivity of polyaniline alone in acidic environments, without and with cobalt nanoparticles measured.Increasing ...

We report expression and mutant phenotypes for a gene cluster in Sinorhizobium meliloti, designated cbtJKL, that has been shown to encode an ABC-type cobalt transport system. Transcription of cbtJKL initiated 384 nucleotides upstream from the cbtJ translation start codon, and the resulting 5' region contained a putative B(12)riboswitch. Expression of the cbtJKL genes appeared to be controlled b...

cythemia in man ansd experimenstal animals. The precise nsechansisnn by which cobalt exerts this actions has not yet beens Clarified comsspletely. Early studies itsdicated that cobalt acts directly by produciisg ass atsoxic coisditioss ins tise marrow,5 while later work suggested an indirect aisoxic effect oss the nsarrow (‘aused by the formatiots of cobalt-ansinso acid coissplexes.#{176} ‘ How...

A surprising effect of halide substituents on reduction potentials and catalytic activity of halogenated cobalt corroles has been deduced by experimental and computational methods; the proton-activating cobalt(I) and the cobalt(II) corrole that is formed in the step during which hydrogen is formed are characterized by NMR spectroscopy.

The structure-activity relations in the alumina-supported cobalt catalysts are studied at the realistic conditions of Fischer-Tropsch synthesis using in situ time-resolved XRD and catalytic measurements. Cobalt sintering during the first 3-5 h of the reaction and cobalt carbidisation at a longer time on stream (>8 h) coincide with catalyst deactivation.

Cobalt-mediated radical polymerisation of methyl acrylate is effected at moderate temperature by both a square planar bis(beta-ketoaminato)cobalt(II) complex in the presence of V-70 diazo radical initiator, and by a well-defined cobalt(III) alkyl derivative in the absence of a diazo complex. Polymerisation rates suggest that both reversible termination and degenerative transfer mechanisms are o...

A trigon structure formed by submonolayer gadolinium deposition onto Au(111) is revealed as a robust growth template for cobalt nanodot arrays by Frederik Schiller and co-workers in article 1600187. The cobalt nanoislands behave as independent magnetic entities with an out-of-plane easy axis of anisotropy and enhanced magnetic anisotropy values, as compared to other self-organized cobalt nanodo...