Cyclopentene, 1-methyl-

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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)195.1kcal/molN/AHunter and Lias, 1998HL
Quantity Value Units Method Reference Comment
Gas basicity188.1kcal/molN/AHunter and Lias, 1998HL

Ionization energy determinations

IE (eV) Method Reference Comment
8.59EILossing and Traeger, 1975LLK
8.60 ± 0.01PERang, Paldoia, et al., 1974LLK
9.12 ± 0.05EIPraet, 1970RDSH
8.55 ± 0.01PIPraet, 1970RDSH
8.54 ± 0.01PEPraet and Delwiche, 1970RDSH
8.62 ± 0.02EIWinters and Collins, 1969RDSH

Appearance energy determinations

Ion AE (eV) Other Products MethodReferenceComment
C3H3+13.23 ± 0.21?EIWinters and Collins, 1969RDSH
C3H5+13.7C4H7EIShikhmamedbekova, Aslanov, et al., 1970RDSH
C3H5+14.9 ± 0.1?EIPraet, 1970RDSH
C3H5+12.45 ± 0.13?EIWinters and Collins, 1969RDSH
C4H5+13.14 ± 0.09?EIWinters and Collins, 1969RDSH
C4H6+12.33 ± 0.05C2H4EIPraet, 1970RDSH
C4H6+11.02 ± 0.12?EIWinters and Collins, 1969RDSH
C5H5+13.45 ± 0.19?EIWinters and Collins, 1969RDSH
C5H7+8.59CH3EILossing and Traeger, 1975, 2LLK
C5H7+10.19HEILossing and Traeger, 1975LLK
C5H7+11.59 ± 0.05CH3EIPraet, 1970RDSH
C5H7+9.99 ± 0.09CH3EIWinters and Collins, 1969RDSH
C6H7+12.40 ± 0.17H2+HEIWinters and Collins, 1969RDSH
C6H9+11.97 ± 0.05HEIPraet, 1970RDSH
C6H9+10.59 ± 0.13HEIWinters and Collins, 1969RDSH


Go To: Top, 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.

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, . [all data]

Lossing and Traeger, 1975
Lossing, F.P.; Traeger, J.C., Stabilization in cyclopentadienyl, cyclopentenyl, and cyclopentyl cations, J. Am. Chem. Soc., 1975, 97, 1579. [all data]

Rang, Paldoia, et al., 1974
Rang, S.; Paldoia, P.; Talvari, A., Ionization potentials of unsaturated hydrocarbons. 2. Mono-substituted cyclopentenes and cyclohexenes, Eesti. NSV Tead. Akad. Toim., 1974, 354. [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]

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]

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]

Lossing and Traeger, 1975, 2
Lossing, F.P.; Traeger, J.C., Free radicals by mass spectrometry XLVI. Heats of formation of C5H7 and C5H9 radicals and cations., J. Am. Chem. Soc., 1975, 19, 9. [all data]


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