Thermal unimolecular isomerisation of cis-hexa-1,3-diene
- 1 January 1966
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc. A
- p. 1701-1702
- https://doi.org/10.1039/j19660001701
Abstract
cis-Hexa-1,3-diene isomerises in the gas phase by a first-order homogeneous process to yield cis,trans-hexa-2,4-diene as the major product. Small amounts of cis,cis-hexa-2,4-diene are also formed, partly direct from the reactant and partly as a secondary product from the initially formed cis,trans-diene. In the temperature range 475–518°K the rate constants for the isomerisation to the cis,trans-hexa-2,4-diene fit the Arrhenius equation k= 1010·80 exp(–32,500/RT) sec.–1. The rate constants are independent of pressure in the range 2–70 mm. The reaction is considered to be truly unimolecular, proceeding through a 6-centre, hydrogen-bridged transition state.Keywords
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