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Title Thermodynamics of cyclopentane, methylcyclopentane and 1,cis-3-dimethylcyclopentane: verification of the concept of pseudorotation
Creator/Author McCullough, J.P. ; Pennington, R.E. ; Smith, J.C. ; Hossenlopp, I.A. ; Waddington, G.
Publication Date1959 Nov 20
OSTI IdentifierOSTI ID: 7219955
Other Number(s)CODEN: JACSA
Resource TypeJournal Article
Resource RelationJ. Am. Chem. Soc. ; Vol/Issue: 81:22
Research OrgBureau of Mines, Bartlesville, OK
Subject400301 -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987); ;CYCLOALKANES-- SPECIFIC HEAT;CYCLOALKANES-- VAPORIZATION HEAT; CALORIMETRY;HIGH TEMPERATURE;LOW TEMPERATURE;MEDIUM TEMPERATURE;ROTATIONAL STATES;THERMODYNAMICS;ULTRALOW TEMPERATURE;VERY HIGH TEMPERATURE;VERY LOW TEMPERATURE
Related SubjectALKANES;ENERGY LEVELS;ENTHALPY;EXCITED STATES;HYDROCARBONS;ORGANIC COMPOUNDS;PHYSICAL PROPERTIES;THERMODYNAMIC PROPERTIES;TRANSITION HEAT
Description/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.
Country of PublicationUnited States
LanguageEnglish
FormatPages: 5880-5883
System Entry Date2001 May 13

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