Propanoic acid, 2,2-dimethyl-

• Formula: C₅H₁₀O₂
• Molecular weight: 102.1317
• IUPAC Standard InChI: InChI=1S/C5H10O2/c1-5(2,3)4(6)7/h1-3H3,(H,6,7) Copy

  
• IUPAC Standard InChIKey: IUGYQRQAERSCNH-UHFFFAOYSA-N Copy
• CAS Registry Number: 75-98-9
• Chemical structure:
  This structure is also available as a 2d Mol file or as a computed 3d SD file
  The 3d structure may be viewed using Java or Javascript.
• Other names: Pivalic acid; α,α-Dimethylpropionic acid; tert-Pentanoic acid; Neopentanoic acid; Trimethylacetic acid; 2,2-Dimethylpropanoic acid; 2,2-Dimethylpropionic acid; tert-C4H9COOH; Acetic acid, trimethyl-; Propionic acid, 2,2-dimethyl-; Kyselina 2,2-dimethylpropionova; Kyselina pivalova; NSC 65449; Neovaleric acid; Versatic 5
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• Information on this page:
  • Condensed phase thermochemistry data
  • Phase change data
  • Reaction thermochemistry data
  • Gas phase ion energetics data
  • IR Spectrum
  • Gas Chromatography
  • References
  • Notes
• Other data available:
  • Henry's Law data
  • Ion clustering data
  • Mass spectrum (electron ionization)
• Data at other public NIST sites:
  • Gas Phase Kinetics Database
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Condensed 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
DH - Eugene S. Domalski and Elizabeth D. Hearing

Constant pressure heat capacity of solid

Phase change 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:
BS - Robert L. Brown and Stephen E. Stein
TRC - Thermodynamics Research Center, NIST Boulder Laboratories, Chris Muzny director
AC - William E. Acree, Jr., James S. Chickos
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
DH - Eugene S. Domalski and Elizabeth D. Hearing

Enthalpy of vaporization

Enthalpy of sublimation

Enthalpy of fusion

Enthalpy of phase transition

Entropy of phase transition

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 as indicated in comments:
B - John E. Bartmess
M - Michael M. Meot-Ner (Mautner) and Sharon G. Lias
ALS - 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

C₅H₉O₂^- +  =

By formula: C₅H₉O₂^- + H⁺ = C₅H₁₀O₂

 +  = ( • )

By formula: I^- + C₅H₁₀O₂ = (I^- • C₅H₁₀O₂)

 +  = 2

By formula: C₁₀H₁₈O₃ + H₂O = 2C₅H₁₀O₂

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

Ionization energy determinations

De-protonation reactions

C₅H₉O₂^- +  =

By formula: C₅H₉O₂^- + H⁺ = C₅H₁₀O₂

IR Spectrum

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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: NIST Mass Spectrometry Data Center, William E. Wallace, director

Gas Phase Spectrum

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Additional Data

Gas Chromatography

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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: NIST Mass Spectrometry Data Center, William E. Wallace, director

Van Den Dool and Kratz RI, polar column, temperature ramp

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Normal alkane RI, non-polar column, custom temperature program

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Normal alkane RI, polar column, temperature ramp

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Normal alkane RI, polar column, custom temperature program

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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.

Hancock, Watson, et al., 1954
Hancock, C.K.; Watson, G.M.; Gilby, R.F., Heats of combustion of five-carbon fatty acids and their methyl and ethyl esters, J. Phys. Chem., 1954, 58, 127-129. [all data]

Cox and Pilcher, 1970
Cox, J.D.; Pilcher, G., Thermochemistry of Organic and Organometallic Compounds, Academic Press, New York, 1970, 1-636. [all data]

Singh and Glicksman, 1990
Singh, N.B.; Glicksman, M.E., Physical properties of ultra-pure pivalic acid, Thermochim. Acta, 1990, 159, 93-99. [all data]

Konicek and Wadso, 1971
Konicek, J.; Wadso, I., Thermochemical properties of some carboxylic acids, amines and N-substituted amides in aqueous solution, Acta Chem. Scand., 1971, 25, 1541-1551. [all data]

Kruif and Oonk, 1979
Kruif, C.G.; Oonk, H.A.J., Enthalpies of vaporization and vapour pressures of seven aliphatic carboxylic acids, J. Chem. Thermodyn., 1979, 11, 287-290. [all data]

Steele, Chirico, et al., 2002
Steele, W.V.; Chirico, R.D.; Cowell, A.B.; Knipmeyer, S.E.; Nguyen, A., Thermodynamic Properties and Ideal-Gas Enthalpies of Formation for trans -Methyl Cinnamate, α-Methyl Cinnamaldehyde, Methyl Methacrylate, 1-Nonyne, Trimethylacetic Acid, Trimethylacetic Anhydride, and Ethyl Trimethyl Acetate, J. Chem. Eng. Data, 2002, 47, 4, 700-714, https://doi.org/10.1021/je010086r . [all data]

Verevkin, 2000
Verevkin, S.P., Measurement and Prediction of the Monocarboxylic Acids Thermochemical Properties, J. Chem. Eng. Data, 2000, 45, 5, 953-960, https://doi.org/10.1021/je990282m . [all data]

Murrill and Breed, 1970
Murrill, E.; Breed, L., Solid-solid phase transitions determined by differential scanning calorimetry, Thermochim. Acta, 1970, 1, 239-246. [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]

Jinfeng, Topsom, et al., 1988
Jinfeng, C.; Topsom, R.D.; Headley, A.D.; Koppel, I.; Mishima, M.; Taft, R.W.; Veji, S., Acidities of Substituted Acetic Acids, J. Mol. Struct., 1988, 168, 141, https://doi.org/10.1016/0166-1280(88)80349-X . [all data]

Caldwell and Kebarle, 1984
Caldwell, G.; Kebarle, P., Binding energies and structural effects in halide anion-ROH and -RCOOH complexes from gas phase equilibria measurements, J. Am. Chem. Soc., 1984, 106, 967. [all data]

Conn, Kistiakowsky, et al., 1942
Conn, J.B.; Kistiakowsky, G.B.; Roberts, R.M.; Smith, E.A., Heats of organic reactions. XIII. Heats of hydrolysis of some acid anhydrides, J. Am. Chem. Soc., 1942, 64, 1747-17. [all data]

Holmes, Fingas, et al., 1981
Holmes, J.L.; Fingas, M.; Lossing, F.P., Towards a general scheme for estimating the heats of formation of organic ions in the gas phase. Part I. Odd-electron cations, Can. J. Chem., 1981, 59, 80. [all data]

Green and Hayes, 1975
Green, J.C.; Hayes, A.J., Ionization energies of an Mo-Mo quadruple bond; a He(I) photoelectron study of some molybdenum-dycarboxylate dimers, Chem. Phys. Lett., 1975, 31, 306. [all data]

Chung, Fung, et al., 2005
Chung, H.Y.; Fung, P.K.; Kim, J.-S., Aroma impact components in commercial plain sufu, J. Agric. Food Chem., 2005, 53, 5, 1684-1691, https://doi.org/10.1021/jf048617d . [all data]

Zhao, Li, et al., 2008
Zhao, Y.; Li, J.; Xu, Y.; Duan, H.; Fan, W.; Zhao, G., EXtraction, preparation and identification of volatile compounds in Changyu XO brandy, Chinese J. Chromatogr., 2008, 26, 2, 212-222, https://doi.org/10.1016/S1872-2059(08)60014-0 . [all data]

Prososki, Etzel, et al., 2007
Prososki, R.A.; Etzel, M.R.; Rankin, S.A., Solvent type affects the number, distribution, and relative quantities of volatile compounds found in sweet whey powder, J. Dairy Sci., 2007, 90, 2, 523-531, https://doi.org/10.3168/jds.S0022-0302(07)71535-7 . [all data]

Suhardi, Suzuki, et al., 2002
Suhardi, S.; Suzuki, M.; Yoshida, K.; Muto, T.; Fujita, A.; Watanbe, N., Changes in the volatile compounds and in the chemical and physical properties of snake fruit (Salacca edulis Reinw) Cv. Pondoh during maturation, J. Agric. Food Chem., 2002, 50, 26, 7627-7633, https://doi.org/10.1021/jf020620e . [all data]

Sekiwa, Kubota, et al., 1997
Sekiwa, Y.; Kubota, K.; Kobayashi, A., Characteristic flavor components in the brew of cooked clam (Meretrix lusoria) and the effect of storage on flavor formation, J. Agric. Food Chem., 1997, 45, 3, 826-830, https://doi.org/10.1021/jf960433e . [all data]

Johanningsmeier and McFeeters, 2011
Johanningsmeier, S.D.; McFeeters, R.F., Detection of volatile spoilage metabolites in fermented cucumbers using nontargeted, comprehensive 2-dimensional gas chromatography-time-of-flight mass spectrometry (GCxGCxTOFMS), J. Food Sci., 2011, 76, 1, c168-c177, https://doi.org/10.1111/j.1750-3841.2010.01918.x . [all data]

Notes

Go To: Top, Condensed phase thermochemistry data, Phase change data, Reaction thermochemistry data, Gas phase ion energetics data, IR Spectrum, Gas Chromatography, References

• Symbols used in this document:
  

  Cp,solid	Constant pressure heat capacity of solid
  Tboil	Boiling point
  Tfus	Fusion (melting) point
  ΔHtrs	Enthalpy of phase transition
  ΔStrs	Entropy of phase transition
  ΔcH°solid	Enthalpy of combustion of solid at standard conditions
  ΔfH°solid	Enthalpy of formation of solid at standard conditions
  ΔfusH	Enthalpy of fusion
  ΔrG°	Free energy of reaction at standard conditions
  ΔrH°	Enthalpy of reaction at standard conditions
  ΔrS°	Entropy of reaction at standard conditions
  ΔsubH	Enthalpy of sublimation
  ΔsubH°	Enthalpy of sublimation at standard conditions
  ΔvapH	Enthalpy of vaporization

• Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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