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Butanoic acid, 3-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 compiled as indicated in comments:
B - John E. Bartmess
LLK - Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi
LBLHLM - Sharon G. Lias, John E. Bartmess, Joel F. Liebman, John L. Holmes, Rhoda D. Levin, and W. Gary Mallard

Ionization energy determinations

IE (eV) Method Reference Comment
10.51PEWatanabe, Yokoyama, et al., 1973Vertical value; LLK

Appearance energy determinations

Ion AE (eV) Other Products MethodReferenceComment
C2H4O2+10.8 ± 0.1C3H6EIAudier, Milliet, et al., 1985LBLHLM
C2H5O2+10.4 ± 0.1C3H5EIAudier, Milliet, et al., 1985LBLHLM

De-protonation reactions

C5H9O2- + Hydrogen cation = Butanoic acid, 3-methyl-

By formula: C5H9O2- + H+ = C5H10O2

Quantity Value Units Method Reference Comment
Deltar345.5 ± 2.1kcal/molG+TSCaldwell, Renneboog, et al., 1989gas phase; B
Deltar346.7 ± 2.1kcal/molG+TSTaft and Topsom, 1987gas phase; B
Quantity Value Units Method Reference Comment
Deltar338.5 ± 2.0kcal/molIMRECaldwell, Renneboog, et al., 1989gas phase; B
Deltar339.7 ± 2.0kcal/molIMRETaft and Topsom, 1987gas phase; B

References

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

Watanabe, Yokoyama, et al., 1973
Watanabe, I.; Yokoyama, Y.; Ikeda, S., Lone pair ionization potentials of carboxylic acids determined by He(I) photoelectron spectroscopy, Bull. Chem. Soc. Jpn., 1973, 46, 1959. [all data]

Audier, Milliet, et al., 1985
Audier, H.; Milliet, A.; Sozzi, G., Isomerisation des cation radicaux acides pentanoique et methyl-3-butanoique in phase gazeuse, Bull. Soc. Chim. France, 1985, 5, 833. [all data]

Caldwell, Renneboog, et al., 1989
Caldwell, G.; Renneboog, R.; Kebarle, P., Gas Phase Acidities of Aliphatic Carboxylic Acids, Based on Measurements of Proton Transfer Equilibria, Can. J. Chem., 1989, 67, 4, 661, https://doi.org/10.1139/v89-092 . [all data]

Taft and Topsom, 1987
Taft, R.W.; Topsom, R.D., The Nature and Analysis of Substituent Effects, Prog. Phys. Org. Chem., 1987, 16, 1. [all data]


Notes

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