Cyclopentane, methylene-

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Gas phase thermochemistry data

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled as indicated in comments:
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
GT - Glushko Thermocenter, Russian Academy of Sciences, Moscow

Quantity Value Units Method Reference Comment
Δfgas2.43kcal/molChydAllinger, Dodziuk, et al., 1982ALS

Constant pressure heat capacity of gas

Cp,gas (cal/mol*K) Temperature (K) Reference Comment
24.410298.15Andreevskii D.N., 1976GT
24.579300.
33.681400.
41.730500.
48.430600.
54.001700.
58.681800.
62.641900.
66.0211000.

Reaction thermochemistry data

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled by: Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein

Note: Please consider using the reaction search for this species. This page allows searching of all reactions involving this species. A general reaction search form is also available. Future versions of this site may rely on reaction search pages in place of the enumerated reaction displays seen below.

Individual Reactions

Hydrogen + Cyclopentane, methylene- = Cyclopentane, methyl-

By formula: H2 + C6H10 = C6H12

Quantity Value Units Method Reference Comment
Δr-27.70 ± 0.23kcal/molChydAllinger, Dodziuk, et al., 1982liquid phase; solvent: Hexane
Δr-26.88 ± 0.02kcal/molChydTurner and Garner, 1958liquid phase; solvent: Acetic acid
Δr-26.85 ± 0.05kcal/molChydTurner and Garner, 1957liquid phase; solvent: Acetic acid
Δr-26.82 ± 0.08kcal/molChydTurner and Garner, 1957, 2liquid phase; solvent: Acetic acid

Cyclopentene, 1-methyl- = Cyclopentane, methylene-

By formula: C6H10 = C6H10

Quantity Value Units Method Reference Comment
Δr3.78 ± 0.20kcal/molEqkYursha and Kabo, 1975gas phase

Gas phase ion energetics data

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data evaluated as indicated in comments:
HL - Edward P. Hunter and Sharon G. Lias

Data compiled as indicated in comments:
LLK - Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron

View reactions leading to C6H10+ (ion structure unspecified)

Quantity Value Units Method Reference Comment
Proton affinity (review)198.9kcal/molN/AHunter and Lias, 1998HL
Quantity Value Units Method Reference Comment
Gas basicity192.0kcal/molN/AHunter and Lias, 1998HL

Ionization energy determinations

IE (eV) Method Reference Comment
8.70 ± 0.05EIWolkoff and Holmes, 1979LLK
8.96 ± 0.02PEBieri, Burger, et al., 1977LLK
7.2EIShikhmamedbekova, Aslanov, et al., 1970RDSH
9.26 ± 0.05EIPraet, 1970RDSH
8.55 ± 0.01PIPraet, 1970RDSH
8.51 ± 0.01PEPraet and Delwiche, 1970RDSH
8.94 ± 0.01PIDemeo and El-Sayed, 1970RDSH
9.05 ± 0.02EIWinters and Collins, 1969RDSH
9.14PEWiberg, Ellison, et al., 1976Vertical value; LLK

Appearance energy determinations

Ion AE (eV) Other Products MethodReferenceComment
C3H3+13.44 ± 0.20?EIWinters and Collins, 1969RDSH
C3H5+10.2C3H5EIShikhmamedbekova, Aslanov, et al., 1970RDSH
C3H5+14.05 ± 0.05C3H5EIPraet, 1970RDSH
C3H5+12.03 ± 0.13?EIWinters and Collins, 1969RDSH
C4H5+9.7C2H5EIShikhmamedbekova, Aslanov, et al., 1970RDSH
C4H5+12.69 ± 0.17?EIWinters and Collins, 1969RDSH
C4H6+10.2C2H4EIShikhmamedbekova, Aslanov, et al., 1970RDSH
C4H6+12.32 ± 0.05C2H4EIPraet, 1970RDSH
C4H6+10.88 ± 0.07?EIWinters and Collins, 1969RDSH
C5H5+13.45 ± 0.19?EIWinters and Collins, 1969RDSH
C5H7+10.02 ± 0.05CH3EIWolkoff and Holmes, 1979LLK
C5H7+8.2CH3EIShikhmamedbekova, Aslanov, et al., 1970RDSH
C5H7+11.71 ± 0.05CH3EIPraet, 1970RDSH
C5H7+9.65 ± 0.03CH3EIWinters and Collins, 1969RDSH
C5H8+9.2CH2EIShikhmamedbekova, Aslanov, et al., 1970RDSH
C6H7+11.66 ± 0.16H2+HEIWinters and Collins, 1969RDSH
C6H8+8.7H2EIShikhmamedbekova, Aslanov, et al., 1970RDSH
C6H9+12.13 ± 0.05HEIPraet, 1970RDSH
C6H9+10.20 ± 0.03HEIWinters and Collins, 1969RDSH

References

Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry data, Gas phase ion energetics data, Notes

Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Allinger, Dodziuk, et al., 1982
Allinger, N.L.; Dodziuk, H.; Rogers, D.W.; Naik, S.N., Heats of hydrogenation and formation of some 5-membered ring compounds by molecular mechanics calculations and direct measurements, Tetrahedron, 1982, 38, 1593-1597. [all data]

Andreevskii D.N., 1976
Andreevskii D.N., The similar structures method in thermodynamics of C3-C5 methylenecycloalkanes, Zh. Strukt. Khim., 1976, 17, 51-57. [all data]

Turner and Garner, 1958
Turner, R.B.; Garner, R.H., Heats of hydrogenation. V. Relative stabilities in certain exocyclic-endocyclic olefin pairs, J. Am. Chem. Soc., 1958, 80, 1424-1430. [all data]

Turner and Garner, 1957
Turner, R.B.; Garner, R.H., Heats of hydrogenation. V. Relative stabilities in certain exocyclic-endocyclic olefin pairs, J. Am. Chem. Soc., 1957, 80, 1424-1430. [all data]

Turner and Garner, 1957, 2
Turner, R.B.; Garner, R.H., The stability relationship of 1-methyl-cyclopentene and methylenecyclopentane, J. Am. Chem. Soc., 1957, 79, 253. [all data]

Yursha and Kabo, 1975
Yursha, I.A.; Kabo, G.Ya., Thermodynamics of the isomerisation of methylcyclopentines, Russ. J. Phys. Chem. (Engl. Transl.), 1975, 49, 765-766. [all data]

Hunter and Lias, 1998
Hunter, E.P.; Lias, S.G., Evaluated Gas Phase Basicities and Proton Affinities of Molecules: An Update, J. Phys. Chem. Ref. Data, 1998, 27, 3, 413-656, https://doi.org/10.1063/1.556018 . [all data]

Wolkoff and Holmes, 1979
Wolkoff, P.; Holmes, J.L., Isomeric cyclic [C6H10]+ ions. The energy barrier to ring opening, Can. J. Chem., 1979, 57, 348. [all data]

Bieri, Burger, et al., 1977
Bieri, G.; Burger, F.; Heilbronner, E.; Maier, J.P., Valence ionization enrgies of hydrocarbons, Helv. Chim. Acta, 1977, 60, 2213. [all data]

Shikhmamedbekova, Aslanov, et al., 1970
Shikhmamedbekova, A.Z.; Aslanov, F.A.; Gadzhiev, M.M.; Gulamova, T.E.; Akhmedova, F.N., Mass spectrometric study of methylene cycloalkenes, Dokl. Phys. Chem., 1970, 26, 34. [all data]

Praet, 1970
Praet, M.-Th., Ionisation et dissociation du 1-methyl-cyclopentene, du methylenecyclopentane et de quelques isomeres par impact d'electrons et de photons, Org. Mass Spectrom., 1970, 4, 65. [all data]

Praet and Delwiche, 1970
Praet, M.-T.; Delwiche, J., Ionization energies of some cyclic molecules, Chem. Phys. Lett., 1970, 5, 546. [all data]

Demeo and El-Sayed, 1970
Demeo, D.A.; El-Sayed, M.A., Ionization potential and structure of olefins, J. Chem. Phys., 1970, 52, 2622. [all data]

Winters and Collins, 1969
Winters, R.E.; Collins, J.H., Mass spectrometric studies of structural isomers. II.Mono- and bicyclic C6H10 molecules, Org. Mass Spectrom., 1969, 2, 299. [all data]

Wiberg, Ellison, et al., 1976
Wiberg, K.B.; Ellison, G.B.; Wendoloski, J.J.; Brundle, C.R.; Kuebler, N.A., Electronic states of organic molecules. 3. Photoelectron spectra of cycloalkenes and methylenecycloalkanes, J. Am. Chem. Soc., 1976, 98, 7179. [all data]


Notes

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