Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9694173 | Thermochimica Acta | 2005 | 4 Pages |
Abstract
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.
Keywords
Related Topics
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Chemical Engineering
Fluid Flow and Transfer Processes
Authors
Rafael C. Seiceira, Camila M. Higa, Amaro G. Jr., João F. Cajaiba da Silva,