Thermal isomerization of cyclobutenes. Part 10.—3,3-Dimethylcyclobutene and 1,3,3-trimethylcyclobutene
- 1 January 1967
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Transactions of the Faraday Society
- Vol. 63, 1166-1170
- https://doi.org/10.1039/tf9676301166
Abstract
The thermal isomerization of 3,3-dimethylcyclobutene and 1,3,3-trimethylcyclobutene have been investigated in the gas phase in the temperature ranges 150–200°C and 172–213°C respectively. These isomerizations were homogeneous first-order reactions with rate constants independent of pressure over a wide pressure range. The rate constant for the isomerization of 3,3-dimethylcyclobutene fitted the Arrhenius equation, k= 1013·93 exp (–36,090/RT) sec–1. Those for the 1,3,3-trimethylcyclobutene fitted the Arrhenius equation, k= 1013·90 exp (–37,030/RT) sec–1. The effect of alkyl substitutents on the free energy of activation for the isomerization of cyclobutenes is discussed.Keywords
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