- 作者: 楊永華; 林弘敏; 林明源
- 作者服務機構: Department of Chemistry, National Taiwan Normal University, Taipei, Taiwan 107
- 中文摘要: Thermal transesterification of phenylurethane with n-octanol was carried out in DMSO. It was found that the reaction followed first-order kinetics with an average rate constant of 8.630×10¯5 sec¯1 at 140℃. High pressure liquid chromatograph technique was employed to analyze chemical species in the course of the reaction. The reaction obeyed Arrhenius equation closely between 133℃ and 155℃ with activation energy of 29.6 kcal/mole and entropy of activation of -8.2 cal/mole deg at 140℃. An intramolecular cyclic intermediate mechanism was proposed for this reaction.
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