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Studies of Thermal Transesterification of Phenylurethane by High Pressure Liquid Chromatograph
Author(s) -
Young Yong Hwa,
Lin Horng Min,
Lin Ming Yuan
Publication year - 1978
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.197800037
Subject(s) - chemistry , activation energy , arrhenius equation , entropy of activation , transesterification , reaction rate constant , intramolecular force , kinetics , chemical kinetics , order of reaction , analytical chemistry (journal) , chromatography , thermodynamics , organic chemistry , catalysis , physics , quantum mechanics
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°C. 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°C and 155°C with activation energy of 29.6 kcal/mole and entropy of activation of −8.2 cal/mole deg at 140°C. An intramolecular cyclic intermediate mechanism was proposed for this reaction.