Ortho Effect, III.:Ortho Effect in the Ionizaion of Substituted Anilinium Ions.

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概要

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• In order to elucidate the nature of the ortho effect in the ionization of substituted anilinium ions, microscopic dissociation constants of 2-substituted (OCH<SUB>3</SUB>, CH<SUB>3</SUB>, H, Cl, Br) 5-carboxy anilines were determined in water at 25°C. As was mentioned in Part II, three substituent effects on the ortho effect were established ; those involved in the initial state, those in the ionization step, and those in the final state of the equilibrium. From those values, it was deduced that in the ionization of aniliniun ions, the direct field effect in the initial step would be the main cause for the ortho effect in this equilibrium, the steric inhibition of resonance in the final state also contributing as a minor factor.

• 社団法人 有機合成化学協会の論文

著者

• 北条 卓

  京都大学工学合成化学教室

関連論文

• オルト効果(第6報) : 置換オルト・トリル酸エチルのアルカリ加水分解におけるオルト効果の置換基効果
• Ortho Effect. II.:Ortho Effect in the Ionizations of Substituted Benzoic Acids.
• Ortho Effect. V:Rates of Alkaline Hydrolysis of Ethyl Benzoates in Aqueous Dimethyl Sulfoxide.
• Ortho Effect, III.:Ortho Effect in the Ionizaion of Substituted Anilinium Ions.

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