A comparative study of nickel and cobalt catalysts in the hydrogenation of substituted acetophenones. Dependence of hydrogenation rate and adsorption strength on substituents and solvents.
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概要
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The difference in the nature of nickel and cobalt catalysts has been investigated by a comparative study of the competitive hydrogenation of substituted acetophenones. The electronic and steric effects of substituents and the effects of solvents on the adsorption strength of acetophenones are greater for the reactions over R-Ni than for those over R-Co. On R-Co catalyst acetophenones substituted with electron attracting groups (3-methoxyl, 3-hydroxyl, and 4-fluoro groups with σ<SUP>0</SUP>>0) are adsorbed more strongly than those with electron donating groups (2-, 3-, and 4-alkyl and 4-methoxyl groups with σ<SUP>0</SUP><0). Over R-Ni catalyst the adsorption of acetophenone is greater than that of any substituted acetophenones. The rates of hydrogenation over R-Ni are more susceptible to the effects of substituent and solvent than those over R-Co. Over both R-Ni and R-Co the rates of hydrogenation of unsubstituted acetophenones are greater than those of substituted acetophenones with either electron donating or electron attracting groups.
- 公益社団法人 日本化学会の論文
著者
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Takahashi Kazunori
Department Of Electrical And Electronic Engineering Iwate University
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KAJITANI Masatsugu
Department of Chemistry, Faculty of Science and Technology, Sophia University
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Sugimori Akira
Department Of Chemistry Faculty Of Science And Technology Sophia University
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Kasuya Kazuhiko
Department Of Digestive Surgery Hachioji Medical Center Of Tokyo Medical University
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Abe Tsutomu
Department of Chemistry, Faculty of Science and Technology, Sophia University
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SUZUKI Naoki
Department of Agricultural Chemistry, Ibaraki University
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Kaneko Yoshimitsu
Department of Chemistry, Faculty of Science and Technology, Sophia University
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Kasuya Kazuhiko
Department of Chemistry, Faculty of Science and Technology, Sophia University
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