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4 results on '"cobalt-carbon bond"'

1. Crystallography of vitamin B12 proteins

Author

Randaccio, Lucio, Geremia, Silvano, and Wuerges, Jochen

Subjects
*X-ray crystallography, *VITAMIN B12, *MICRONUTRIENTS, *CRYSTALLOGRAPHY
Abstract

Abstract: This review deals with results from crystallographic studies on proteins that interact with the essential micronutrient cobalamin (vitamin B12). Both B12-dependent enzymes and B12-transport proteins are described with an emphasis on structural aspects of cobalamin and its protein environment. [Copyright &y& Elsevier]

Published
2007
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2. Crystallography of Vitamin B12 Proteins

Author

Jochen Wuerges, Silvano Geremia, Lucio Randaccio, Randaccio, Lucio, Geremia, Silvano, and Wuerges, J.

Subjects
vitamin B12-dependent enzymes, Biochemistry, Cobalamin, Inorganic Chemistry, Protein environment, chemistry.chemical_compound, hemic and lymphatic diseases, Materials Chemistry, polycyclic compounds, cobalt-carbon bond, heterocyclic compounds, vitamin B12 transport, Vitamin B12, Physical and Theoretical Chemistry, cobalamin, X-ray crystallography, chemistry.chemical_classification, integumentary system, Organic Chemistry, nutritional and metabolic diseases, General Medicine, Micronutrient, Crystallography, Enzyme, chemistry, vitamin B12-dependent enzyme
Abstract

This review deals with results from crystallographic studies on proteins that interact with the essential micronutrient cobalamin (vitamin B12). Both B12-dependent enzymes and B12-transport proteins are described with an emphasis on structural aspects of cobalamin and its protein environment.

Published
2007
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3. Cleavage by halogens of carbon-cobalt bonds in organometallic complexes of cobalt(III)

Author

Giovanni Tauzher, Nazario Marsich, Renata Dreos, Giacomo Costa, Dreos, Renata, G., Tauzher, N., Marsich, and G., Costa

Subjects
chemistry.chemical_classification, cobalt-carbon bond, cleavage, Aryl, Organic Chemistry, chemistry.chemical_element, Photochemistry, Biochemistry, Iodine monochloride, Inorganic Chemistry, Metal, chemistry.chemical_compound, chemistry, visual_art, Halogen, Electrophile, Polymer chemistry, Materials Chemistry, visual_art.visual_art_medium, Physical and Theoretical Chemistry, Cobalt, Carbon, Alkyl
Abstract

Axial alkyl or aryl groups, o -bonded to the metal atom in some tetradentate Co III complexes, are readily removed by iodine or iodine monochloride; electrophilic and radical attack on the carbon atom both can occur, depending upon the nature of the axial organic group and the chelating agent.

Published
1975
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4. Cleavage by halogens of carboncobalt bonds in organometallic complexes of cobalt(III)

Author

R. Dreos Garlatti, Giovanni Tauzher, Giacomo Costa, Dreos, Renata, G., Tauzher, and G., Costa

Subjects
Reaction mechanism, Chloroform, cobalt-carbon bond, cleavage, Organic Chemistry, chemistry.chemical_element, Photochemistry, Iodine, Biochemistry, Solvent, Inorganic Chemistry, chemistry.chemical_compound, chemistry, Nucleophile, Halogen, Polymer chemistry, Materials Chemistry, Methanol, Physical and Theoretical Chemistry, Cobalt
Abstract

The mechanism of the reaction between the organocobaloximes RCo(DH)2H2O (DH = dimethylglyoximate) and iodine in methanol has been studied and a comparison made with the corresponding reaction in chloroform. The effect of the solvent on the reaction mechanism and the role of nucleophilic assistance are discussed.

Published
1979

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