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The pyrolysis of trimethylene sulfide. A unimolecular decomposition

✍ Scribed by P. Jeffers; C. Dasch; S. H. Bauer

Publisher
John Wiley and Sons
Year
1973
Tongue
English
Weight
328 KB
Volume
5
Category
Article
ISSN
0538-8066

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✦ Synopsis

Abstract

The kinetics of decomposition of trimethylene sulfide to ethylene and thioformaldehyde was investigated in a single‐pulse shock tube using the Β«relative rateΒ» technique. The extent of reaction was measured in the reflected shock regime from 860Β° to 1170Β°K, but experimental difficulties limited the useful data to the temperature range of 980°–1040Β°K. The first‐order rate constant was found to be k = 10^13.0^ exp (βˆ’48,200/RT) sec^βˆ’1^. This result sets an upper limit of 50 kcal/mole for the standard enthalpy of formation of CH~2~S, with 35 kcal/mole as a more likely value. The isomerization of cyclopropane to propene was used for the reference reaction; in turn, this was checked, in a relative rate experiment, against the pyrolysis of cyclohexene.

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