أعضاء هيئة التدريس - جامعة بنها
Solvolysis rates and activation parameters of phenylchloroformate in water-tetrahydrofuran and water-dioxane mixed solvents
Thermochimica Acta • 1989
معلومات البحث
المؤلفون
• Mahmoud Mousa, El-Hussieny M. Diefallah, Hassan A. Dessouki, Shokar T. Atwa
الكلمات المفتاحية
Science
المجلة العلمية
Thermochimica Acta
الناشر
Elsevier
المجلد
141
العدد
Not Available
الصفحات
1-8
publication.type
International
رابط البحث
Not Available
المواد المرفقة
Not Available
الملخص
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.