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Intramolecular hydrogen isotope effect in the pyrolysis of diethyl carbonate‐1,1,1,2,2‐ d 5
Author(s) -
Farneth William E.,
Beck Thomas L.
Publication year - 1983
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/kin.550150506
Subject(s) - chemistry , arrhenius equation , intramolecular force , kinetic isotope effect , diethyl carbonate , thermal decomposition , decomposition , limiting , atmospheric temperature range , carbonate , isotope , pyrolysis , hydrogen , deuterium , thermodynamics , stereochemistry , organic chemistry , activation energy , ethylene carbonate , mechanical engineering , physics , quantum mechanics , electrode , engineering , electrolyte
The thermal unimolecular decomposition of diethyl carbonate‐1,1,1,2,2‐ d 5 has been examined in the high‐pressure‐limiting region. The observed chemistry is consistent with a simple, competitive two‐channel model:The intramolecular isotope effect k H / k D has been determined, and the relative Arrhenius parameters for the two channels are given by\documentclass{article}\pagestyle{empty}\begin{document}$$ k_{\rm H} /k_D = (0.80 \pm 0.18)\,\exp [(1140 \pm 260){\rm cal/mol/RT}] $$\end{document}over the temperature range of 540–620 K. These Arrhenius parameters predict an isotope effect k H / k D = 5.4 at 300 K.
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