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The kinetics and mechanism of thermal decomposition of alkyl isocyanates

✍ Scribed by P. G. Blake; S. Ijadi-Maghsoodi

Publisher
John Wiley and Sons
Year
1983
Tongue
English
Weight
411 KB
Volume
15
Category
Article
ISSN
0538-8066

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✦ Synopsis

The kinetics of the gas-phase decomposition of ethyl, isopropyl, and t -butyl isocyanates have been studied in the temperature range of 380-530OC. t -Butyl isocyanate decomposes almost exclusively by a unimolecular route to isobutene and HNCO, but in EtNCO and i - PrNCO this route competes with a free-radical chain which produces CO, CHI, and HCN or CHsCN. In i-PrNCO, however, the chain process is very rapidly inhibited by the propene formed in the parallel unimolecular route. A minor heterogeneous bimolecular decomposition in each case gives rise to carbon dioxide and a carbodiimide. Mechanisms and trends in the alkyl isocyanates from methyl through t -butyl are discussed.

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