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Solvolysis rates and activation parameters of phenylchloroformate in water-tetrahydrofuran and water-dioxane mixed solvents
Thermochimica Acta • 1989
Publication Information
Authors
• Mahmoud Mousa, El-Hussieny M. Diefallah, Hassan A. Dessouki, Shokar T. Atwa
Keywords
Science
Journal
Thermochimica Acta
Publisher
Elsevier
Volume
141
Issue
Not Available
Pages
1-8
publication.type
International
Paper Link
Not Available
Supplementary Materials
Not Available
Abstract
Abstract
The rates of hydrolysis of phenylchloroformate were measured over the temperature range 30–55 °C in water-tetrahydrofuran and water-dioxane mixtures of different compositions. The influence of solvent variation on reaction rate was examined in terms of changes in the activation parameters. The activation parameters ΔH★ and ΔS★ for the solvolysis reaction showed minima at a water mole fraction of about 0.5 in water-tetrahydrofuran solvent mixtures, whereas these parameters increased continuously with increasing concentration of water in water-dioxane solvent mixtures. The results are discussed in terms of the polarity of the medium and the change in the solvent structure.
The rates of hydrolysis of phenylchloroformate were measured over the temperature range 30–55 °C in water-tetrahydrofuran and water-dioxane mixtures of different compositions. The influence of solvent variation on reaction rate was examined in terms of changes in the activation parameters. The activation parameters ΔH★ and ΔS★ for the solvolysis reaction showed minima at a water mole fraction of about 0.5 in water-tetrahydrofuran solvent mixtures, whereas these parameters increased continuously with increasing concentration of water in water-dioxane solvent mixtures. The results are discussed in terms of the polarity of the medium and the change in the solvent structure.