Thermodynamics of the geometrical isomerization of 2-butene and 2-pentene

Article abstract of DOI:10.1016/0021-9614(83)90152-0

The use of two different catalysts for the metathesis of alkenes, active in adjoining temperature regions, allowed an accurate determination of the equilibrium constant for the gas-phase cis-trans isomerization of both 2-butene and 2-pentene over the temperature range 250 to 823 K.Because of this broad temperature range, thermodynamic functions of these reactions, viz. ΔG⁰(g, T), ΔH⁰(g, T), ΔS⁰(g, T), and even ΔC_p⁰(g, T), could be evaluated with a higher precision than from thermochemical tables (API, NBS) or from other equilibrium studies.Moreover, the use of recent spectroscopic quantities for 2-butene results in calculat ed values of thermodynamic functions which are more in agreement with our experimental results than the values in the API tables.