J. Mccullough, R. Pennington, J. C. Smith
Nov 20, 1959
Citations
0
Influential Citations
58
Citations
Journal
Journal of the American Chemical Society
Abstract
Cyclopentane, methylcyclopentane and 1,cis-3-dimethylcyclopentane were studied by vapor-flow calorimetry to obtain heat-of-vaporization, vapor-heat-capacity and gas-imperfection data. The accurate calorimetric and spectroscopic information now available for cyclopentane was used to demonstrate that one of the degrees of freedom of this puckered molecule is a ''pseudorotation,'' as originally suggested by Kilpatrick, Pitzer and Spitzer. The chemical thermodynamic properties of cyclopentane, at selected temperatures from 0 to 1500/sup 0/K, were calculated. Thermodynamic properties previously estimated for the methyl derivatives by approximate methods are in good agreement with the new experimental data. This finding shows that the incremental methods of calculating thermodynamic functions of related substances, developed in the last two decades, may be used with a high degree of confidence.