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Your search keyword '"Ahmed A. Eltoukhy"' showing total 8 results
Start Over Author "Ahmed A. Eltoukhy" Topic chemistry.chemical_element
8 results on '"Ahmed A. Eltoukhy"'

1. Products and kinetics of the direct, specific transmetalation of (.mu.4-O)N4Cu(Ni(H2O))3Cl6 (N = N,N-diethylnicotinamide) by M(NS)n reagents (NS = monoanionic S-methyl isopropylidenehydrazinecarbodithioate) in nitrobenzene: a relationship between precursor stabilities and product formation rates

Author

Mohamed A. El-Sayed, Geoffrey Davies, Ahmed A. Eltoukhy, and Saad Al-Shehri

Subjects
Stereochemistry, Kinetics, chemistry.chemical_element, Zinc, Medicinal chemistry, Copper, Inorganic Chemistry, Nitrobenzene, chemistry.chemical_compound, Transmetalation, chemistry, Molecule, Physical and Theoretical Chemistry, Cobalt, Stoichiometry
Abstract

The first kinetic study of specific, stoichiometric monotransmetalations of a heteropolymetallic molecule is reported. The copper(II) center of the target (μ 4 -O)N 4 Cu(Ni(H 2 O)) 3 Cl 6 (D) is specifically replaced by cobalt or zinc from transmetalators Co(NS) 2 (B 1 ), Zn(NS) 2 (B 3 ), and Co(NS) 3 (E). Here, N is N,N-diethylnicotinamide and NS is monoanionic S-methyl isopropylidene-hydrazinecarbodithioate

Published
1990
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3. Transmetalation of tetranuclear copper complexes. 8. Transmetalation of tetranuclear copper(I) complexes with a Co(NS)3 reagent

Author

Mohamed A. El-Sayed, Geoffrey Davies, Maher Henary, Thomas R. Gilbert, and Ahmed A. Eltoukhy

Subjects
Inorganic Chemistry, Transmetalation, Reaction mechanism, Denticity, chemistry, Reagent, Polymer chemistry, chemistry.chemical_element, Reactivity (chemistry), Physical and Theoretical Chemistry, Copper
Abstract

Transmetallation des complexes (DENC) 4 Cu 4 X 4 (DENC=diethylnicotinamide), par le tris(S-methyl isopropylidenehydrazinocarbodithioate)-Co(III) dans les solvants aprotiques sous N 2

Published
1986
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4. Transmetalation of tetranuclear copper complexes. 3. Effects of ligands (L = N,N-diethylnicotimamide or ethyl nicotinate; X = Cl or Br) on the properties of [LNi(H2O)X]4X4, (.mu.-O)[LNi(H2O)]4X4, and [LCuNi(H2O)X2]2Y2 (Y = O or CO3) complexes in aprotic solvents

Author

Geoffrey Davies, Thomas R. Gilbert, Maher Henary, Guang Zuan Cai, and Ahmed A. Eltoukhy

Subjects
Inorganic Chemistry, Transmetalation, Chemistry, Stereochemistry, chemistry.chemical_element, Physical and Theoretical Chemistry, Copper, Medicinal chemistry, Ethyl nicotinate
Abstract

Preparation des complexes par transmetallation. L'eau est coordinee a chaque centre Ni(II) dans les produits transmetalles. Etude de l'isomerisation de [LCuNi(H 2 O) X 2 ] 2 O 2

Published
1985
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5. Transmetalation reactions of tetranuclear copper(II) complexes. 2. Stoichiometry and products of reaction of [(DENC)CuCl]4O2, [(DENC)CuCl]4(CO3)2, [(DENC)CuCl]4Cl4, and (DENC)4Cu4Cl6O (DENC = N,N-diethylnicotinamide) with Ni(NS)2 , the kinetics of product isomerization in aprotic solvents, and inhibition of copper-catalyzed phenolic oxidative coupling by dioxygen through transmetalation

Author

Kay D. Onan, Mikelis Veidis, Guang Zuan Cai, Ahmed A. Eltoukhy, Geoffrey Davies, and Thomas R. Gilbert

Subjects
Denticity, Kinetics, chemistry.chemical_element, General Chemistry, Photochemistry, Biochemistry, Copper, Catalysis, Transmetalation, Colloid and Surface Chemistry, chemistry, Polymer chemistry, Oxidative coupling of methane, Isomerization, Stoichiometry
Published
1984
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6. Limits of direct transmetalation of polynuclear copper(II) complexes with M(NS).eta. reagents. Scissor transmetalators. Synthesis and properties of the trimers (.mu.3-O)(N,py)3Cu3X4 (N = N,N-diethylnicotinamide; py = pyridine; X = Cl, Br)

Author

Ahmed A. Eltoukhy, Maher Henary, Atieh Abu-Raqabah, Mohamed A. El-Sayed, and Geoffrey Davies

Subjects
Infrared, Chemistry, Stereochemistry, medicine.drug_class, chemistry.chemical_element, Carboxamide, Medicinal chemistry, Copper, Inorganic Chemistry, chemistry.chemical_compound, Transmetalation, Reagent, Pyridine, medicine, Physical and Theoretical Chemistry
Abstract

Preparation et caracterisation des complexes du type (μ 3 -O)(N,py) 3 Cu 3 − x M x X 4 , x=0-2, M=Co,Zn: spectrometrie RPE et IR. Reactivite des complexes tetranucleaires (μ 3 -O)(N,py) 4 Cu 4 Cl 6 vis-a-vis de M(NS) n , M=Co, Ni, Zn, Cd, Hg, ou Sn; NS=derive de l'acide dithiocarbohydrazonique

Published
1989
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7. Transmetalation of tetranuclear copper complexes. 5. Transmetalation of copper(I) complexes and stoichiometry and kinetics of oxidation of neutral tetranuclear (DENC)3Cu3M(NS)X4 (DENC = N,N-diethylnicotinamide) complexes by dioxygen in aprotic solvents

Author

Thomas R. Gilbert, Mohamed A. El-Sayed, Geoffrey Davies, Khadija Nabih, and Ahmed A. Eltoukhy

Subjects
Inorganic Chemistry, Transmetalation, chemistry.chemical_compound, Schiff base, chemistry, Kinetics, Polymer chemistry, Inorganic chemistry, chemistry.chemical_element, Physical and Theoretical Chemistry, Copper, Oxygen, Stoichiometry
Abstract

Transmetallation quantitative dans CH 2 Cl 2 ou nitrobenzene pour donner des complexes (DENC) 3 Cu 3 M(NS)X 4 •DENC ou (DENC) 4 M 2 Cl 4 . Donnees cinetiques. Suggestions de structures

Published
1986
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8. Transmetalation of tetranuclear copper complexes. 4. Structural implications of the kinetics of direct transmetalation of tetranuclear copper(II) complexes by Ni(NS)2 reagents

Author

Ahmed A. Eltoukhy, Mohamed A. El-Sayed, and Geoffrey Davies

Subjects
Inorganic Chemistry, Transmetalation, chemistry, Reagent, Kinetics, Inorganic chemistry, Polymer chemistry, chemistry.chemical_element, Physical and Theoretical Chemistry, Copper
Abstract

Lois de vitesse pour les transmetallations directes des complexes (μ 4 -O)[NCu] 4 X 6 (N=diethylnicotinamide, pyridine) par Ni(NS) 2 dans le nitrobenzene, donnant (μ 4 -O)[N 4 Cu 3 Ni]X 6

Published
1986
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