J. Zeng, Sai-Bo Yu, B. Tong
Mar 1, 2011
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Journal
Journal of Thermal Analysis and Calorimetry
Abstract
An N-tert-butyloxycarbonylated organic synthesis intermediate, (S)-tert-butyl 1-phenylethylcarbamate, was prepared and investigated by means of differential scanning calorimetry (DSC) and thermogravimetry (TG). The molar heat capacities of (S)-tert-butyl 1-phenylethylcarbamate were precisely determined by means of adiabatic calorimetry over the temperature range of 80-380 K. There was a solid–liquid phase transition exhibited during the heating process with the melting point of 359.53 K. The molar enthalpy and entropy of this transition were determined to be 29.73 kJ mol−1 and 82.68 J K−1 mol−1 based on the experimental Cp–T curve, respectively. The thermodynamic functions, [$$ H_{T}^{0} - H_{298.15}^{0} $$] and [$$ S_{T}^{0} - S_{298.15}^{0} $$], were calculated from the heat capacity data in the temperature range of 80–380 K with an interval of 5 K. TG experiment showed that the pyrolysis of the compound was started at the temperature of 385 K and terminated at 510 K within one step.