Thermodynamics of cyclopentane, methylcyclopentane and 1,cis-3-dimethylcyclopentane: verification of the concept of pseudorotation

Journal Article · Thu Nov 19 23:00:00 EST 1959 · J. Am. Chem. Soc.; (United States)

DOI:https://doi.org/10.1021/ja01531a009· OSTI ID:7219955

McCullough, J P; Pennington, R E; Smith, J C; Hossenlopp, I A; Waddington, G

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.

• Research Organization: Bureau of Mines, Bartlesville, OK
• OSTI ID: 7219955
• Journal Information: J. Am. Chem. Soc.; (United States), Journal Name: J. Am. Chem. Soc.; (United States) Vol. 81:22; ISSN JACSA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400301* -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
ALKANES
CALORIMETRY
CYCLOALKANES
ENERGY LEVELS
ENTHALPY
EXCITED STATES
HIGH TEMPERATURE
HYDROCARBONS
LOW TEMPERATURE
MEDIUM TEMPERATURE
ORGANIC COMPOUNDS
PHYSICAL PROPERTIES
ROTATIONAL STATES
SPECIFIC HEAT
THERMODYNAMIC PROPERTIES
THERMODYNAMICS
TRANSITION HEAT
ULTRALOW TEMPERATURE
VAPORIZATION HEAT
VERY HIGH TEMPERATURE
VERY LOW TEMPERATURE