کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9694173 | 1459641 | 2005 | 4 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Determination of kinetic parameters and Hammett Ï from the synthesis of triaryl phosphites using reaction calorimetry
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Determination of kinetic parameters and Hammett Ï from the synthesis of triaryl phosphites using reaction calorimetry Determination of kinetic parameters and Hammett Ï from the synthesis of triaryl phosphites using reaction calorimetry](/preview/png/9694173.png)
چکیده انگلیسی
Triaryl phosphites bearing electron donating and electron withdrawing substituents were prepared through the reaction of sodium phenoxides with phosphorus trichloride. The reactions were performed in a Mettler RC1 reaction calorimeter. The main purpose of this work was the determination of Hammett Ï from the synthesis of substituted triaryl phosphites through the interpretation of calorimetric data. The phenoxide bearing a methoxide group was the most reactive, and the one bearing the nitro group was the least reactive. It was demonstrated that the reaction rate depends mainly on the addition rate of phosphorus trichloride solution. A good correlation between the Hammet parameters (Ïp+) was obtained, indicating a reaction mechanism in which a decrease of the negative charge occurs in the transition state.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Thermochimica Acta - Volume 428, Issues 1â2, April 2005, Pages 101-104
Journal: Thermochimica Acta - Volume 428, Issues 1â2, April 2005, Pages 101-104
نویسندگان
Rafael C. Seiceira, Camila M. Higa, Amaro G. Jr., João F. Cajaiba da Silva,