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The thermal decompositions of carbamates. IV. The ethyl N methylcarbamate system
Author(s) -
Daly N. J.,
Ziolkowski F.
Publication year - 1980
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.550120405
Subject(s) - chemistry , methylamine , thermal decomposition , ethylene , condensation , atmospheric temperature range , ethanol , isocyanate , ethyl carbamate , carbamate , decomposition , medicinal chemistry , thermodynamics , organic chemistry , catalysis , physics , polyurethane , food science , wine
Ethyl N methylcarbamate decomposes thermally over the temperature range of 600–650 K by competing first‐order reactions, one forming methylamine, carbon dioxide, and ethylene, the other forming methyl isocyanate and ethanol. The first‐order rate constants are described in S 1 units by the equationswhere R = 1.986 cal/deg mol. The appareance of sym dimethylurea among the products raised the possibility of gas‐phase transesterifications. These were ruled out by the study of the reactions of sym ‐dimethylurea at 604 K which showed its behavior to be well explained by the rapid decomposition in the gas phasewhich is reversed in the condensation stage in the analysis.