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Your search keyword '"Keisuke Wada"' showing total 4 results
Start Over Author "Keisuke Wada" Journal journal of organometallic chemistry
4 results on '"Keisuke Wada"'

1. Hexacarbonylbis(tricyclopentylphosphine)dirhodium and hexacarbonylbis(triisopropylphosphine)dirhodium from a catalytic system for syngas conversion to ethylene glycol

Author

Takeru Onoda, Yasuko Tomotake, Keisuke Wada, Kenji Murayama, Takao Matsuzaki, and Eiichi Watanabe

Subjects
chemistry.chemical_classification, Organic Chemistry, Crystal structure, Biochemistry, Triisopropylphosphine, Catalysis, Inorganic Chemistry, chemistry.chemical_compound, chemistry, Polymer chemistry, X-ray crystallography, Materials Chemistry, Molecule, Organic chemistry, Physical and Theoretical Chemistry, Inorganic compound, Ethylene glycol, Syngas
Abstract

Two dimeric rhodium compounds, [Rh(CO)3P(c-C5H9)3]2 (1) and [Rh)CO)3P(i-Pr)3]2 (2) have been isolated from the catalytic reaction mixtures of syngas conversion to ethylene glycol, and their molecular structures without a bridging carbonyl were determined by single crystal X-ray diffraction studies.

Published
1987

2. Specific rate enhancement by alkylphosphines in a homogeneous rhodium complex-catalyzed hydrogenation of carbon monoxide to ethylene glycol

Author

Tekeru Onoda, Yoshinori Hara, Keisuke Wada, Eiichi Watanabe, and Hiro-O Tanaka

Subjects
Steric effects, Chemistry, Ligand, Organic Chemistry, Inorganic chemistry, chemistry.chemical_element, Biochemistry, Catalysis, Rhodium, Inorganic Chemistry, Reaction rate, chemistry.chemical_compound, Polymer chemistry, Materials Chemistry, Physical and Theoretical Chemistry, Ethylene glycol, Phosphine, Carbon monoxide
Abstract

In the rhodium/alkylphosphine complex catalyzed hydrogenation of carbon monoxide the reaction rate and the productivity of ethylene glycol have been found to depend strongly on the steric as well as electronic properties of the phosphine ligand, and on the phosphine/rhodium ratio. Maximum productivities were attained with the P-i-Pr3/Rh and P-n-Pr3/Rh ratios being about unity and 165, respectively.

Published
1986

3. Effective hydrogenation of carbon monoxide to ethylene glycol using rhodium-trialkylphosphine-nitrogen base catalyst: critical role of nitrogen base promoter in controlling selectivity

Author

Keisuke Wada, Yoshinori Hara, Takeru Onoda, and Eiichi Watanabe

Subjects
chemistry.chemical_classification, Base (chemistry), Organic Chemistry, Inorganic chemistry, chemistry.chemical_element, Biochemistry, Nitrogen, Catalysis, Rhodium, Inorganic Chemistry, chemistry.chemical_compound, chemistry, Materials Chemistry, Methanol, Physical and Theoretical Chemistry, Selectivity, Ethylene glycol, Carbon monoxide
Abstract

In the rhodium/alkylphosphine complex catalyzed hydrogenation of carbon monoxide, the reaction rate and the selectivity to ethylene glycol have been found to be much improved by the addition of nitrogen bases. Examination of the effects of a variety of nitrogen bases for Rh/P-i-Pr3 and Rh/P-n-Bu3 catalyst systems revealed the linear relationships between rate (to ethylene glycol and methanol) and pKa value of the nitrogen base. Use of these catalysts, allowed a space time yield of 280 g/l·h and a selectivity of ethylene glycol of 76% to be achieved.

Published
1989

4. Novel homonuclear disproportionation of [Rh(CO)3P-i-Pr3]2 induced by nitrogen bases; evidence for the existence of the homonuclear ion pair, [Rh(CO)(P-i-Pr3)2(amine)]+[Rh(CO)4]−

Author

Keisuke Wada, Yasuyo Shimada, Eiichi Watanabe, and Takeru Onoda

Subjects
chemistry.chemical_classification, Base (chemistry), Stereochemistry, Organic Chemistry, Triazole, chemistry.chemical_element, Disproportionation, Biochemistry, Medicinal chemistry, Nitrogen, Homonuclear molecule, Rhodium, Inorganic Chemistry, chemistry.chemical_compound, chemistry, Materials Chemistry, Imidazole, Amine gas treating, Physical and Theoretical Chemistry
Abstract

The single RhRh bond, in the dimeric rhodium(0) complex [Rh(CO) 3 P-i-Pr 3 ] 2 , has been found to undergo facile homonuclear disproportionation which in the presence of a nitrogen base, e.g. triazole, imidazole or 4-aminopyridine, gives the homonuclear ion pair, [Rh(CO)(P-i-Pr 3 ) 2 (B)] + [Rh(CO) 4 ] − .

Published
1988

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