The Nature of a Bond between a Water Molecule and a Protonated Propylene in the Activated Complex for the Acid-catalyzed Hydration of Propylene

スポンサーリンク

概要

• 論文の詳細を見る

• The nature of a bond between a water molecule and a protonated propylene in the activated complex for the acid-catalyzed hydration of propylene was discussed. The number of water molecules contained in the activated complex, 1.3, was obtained by applying the acidity function, <I>T</I><SUB>0</SUB>, to the dependency of the log<I>k</I><SUB>1</SUB> on the acid concentration for the hydration of various olefins. The general relationship between the electrostriction and the hydration number of various uni-valent cations was also discussed, and these ions were divided into two separate groups. In the first group, the hydration was caused by electrostatic interaction, while in the second group, the hydration was caused mainly by covalent bond formation. Since the representative point of the hydration of propylene was located near the first group, it was concluded that a molecule of water is held in the activated complex by electrostatic interaction. On the basis of these considerations, the present authors propose a hypothesis which is useful in characterizing the nature of a bond between a water molecule and a protonated substrate in an activated state: (a) If the log<I>k</I><SUB>1</SUB> for a reaction increases linearly with –<I>H</I><SUB>0</SUB>, a water molecule (or molecules) is held in an activated complex by electrostatic interaction. (b) If the log<I>k</I><SUB>1</SUB> for a reaction increases linearly with the log<I>m<SUB>a</SUB></I>, a water molecule is held in an activated complex by the formation of a covalent bond. <I>k</I><SUB>1</SUB>: the first order rate constant; <I>H</I><SUB>0</SUB>: Hammett's acidity function; <I>m<SUB>a</SUB></I>: acid concentration.

• 公益社団法人 日本化学会の論文

著者

• Takaya Haruo

  The Government Chemical Industrial Research Institute

• Takaya Haruo

  The Government Chemical Industrial Reserch Institute, Tokyo

• Todo Naoyuki

  The Government Chemical Industrial Research Institute

• Hosoya Tadasuke

  The Government Chemical Industrial Research Institute

• Minegishi Toshio

  The Government Chemical Industrial Research Institute

関連論文

• Cleaning Effects of the Reactant in the Liquid-phase Isomerization of m-Xylene over a Silica-Alumina Catalyst under Pressure
• The Effect of Pressure on the Rate of the Acid-catalyzed Hydration of Propylene
• The Nature of a Bond between a Water Molecule and a Protonated Propylene in the Activated Complex for the Acid-catalyzed Hydration of Propylene
• Equilibria of the Isomerization of Xylene at 290°C under a Pressure of 300–6000 kg/cm2

スポンサーリンク