Benzoic acid

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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

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Individual Reactions

benzoate anion + Hydrogen cation = Benzoic acid

By formula: C7H5O2- + H+ = C7H6O2

Quantity Value Units Method Reference Comment
Δr1423. ± 9.2kJ/molG+TSFujio, McIver, et al., 1981gas phase; value altered from reference due to change in acidity scale; B
Δr1423. ± 12.kJ/molG+TSCumming and Kebarle, 1978gas phase; Recalculated from data in paper; error in Table vs. ladder; B
Δr1423. ± 9.2kJ/molG+TSCaldwell, Renneboog, et al., 1989gas phase; B
Quantity Value Units Method Reference Comment
Δr1393. ± 8.4kJ/molIMREFujio, McIver, et al., 1981gas phase; value altered from reference due to change in acidity scale; B
Δr1393. ± 8.4kJ/molIMRECumming and Kebarle, 1978gas phase; Recalculated from data in paper; error in Table vs. ladder; B
Δr1394. ± 8.4kJ/molIMRECaldwell, Renneboog, et al., 1989gas phase; B

Bromine anion + Benzoic acid = (Bromine anion • Benzoic acid)

By formula: Br- + C7H6O2 = (Br- • C7H6O2)

Quantity Value Units Method Reference Comment
Δr76.6 ± 7.5kJ/molIMREPaul and Kebarle, 1991gas phase; ΔGaff measured at 423 K, ΔSaff taken as that of PhNO2..Br-; B,M
Quantity Value Units Method Reference Comment
Δr84.J/mol*KN/APaul and Kebarle, 1991gas phase; Entropy change calculated or estimated; M
Quantity Value Units Method Reference Comment
Δr41. ± 4.2kJ/molIMREPaul and Kebarle, 1991gas phase; ΔGaff measured at 423 K, ΔSaff taken as that of PhNO2..Br-; B

Free energy of reaction

ΔrG° (kJ/mol) T (K) Method Reference Comment
41.423.PHPMSPaul and Kebarle, 1991gas phase; Entropy change calculated or estimated; M

Water + Benzoyl chloride = Benzoic acid + Hydrogen chloride

By formula: H2O + C7H5ClO = C7H6O2 + HCl

Quantity Value Units Method Reference Comment
Δr-34.04 ± 0.21kJ/molCmMoselhy and Pritchard, 1975liquid phase; solvent: Diphenyl-ether; see Carson, Pritchard, et al., 1950 and Davies, Dunning, et al., 1972; ALS
Δr-101.9kJ/molCmCarson, Pritchard, et al., 1950liquid phase; Heat of hydrolysis; ALS

Benzaldehyde + perbenzoic acid = 2Benzoic acid

By formula: C7H6O + C7H6O3 = 2C7H6O2

Quantity Value Units Method Reference Comment
Δr-316. ± 13.kJ/molCmBriner and Chastonay, 1954liquid phase; Reanalyzed by Cox and Pilcher, 1970, Original value = -317. ± 13. kJ/mol; ALS

Benzoyl bromide + Water = Hydrogen bromide + Benzoic acid

By formula: C7H5BrO + H2O = HBr + C7H6O2

Quantity Value Units Method Reference Comment
Δr-113.1kJ/molCmCarson, Pritchard, et al., 1950liquid phase; Heat of hydrolysis; ALS

Benzoyl iodide + Water = Hydrogen iodide + Benzoic acid

By formula: C7H5IO + H2O = HI + C7H6O2

Quantity Value Units Method Reference Comment
Δr-102.4kJ/molCmCarson, Pritchard, et al., 1950liquid phase; Heat of hydrolysis; ALS

Water + Benzoic acid, methyl ester = Benzoic acid + Methyl Alcohol

By formula: H2O + C8H8O2 = C7H6O2 + CH4O

Quantity Value Units Method Reference Comment
Δr-73.0 ± 1.9kJ/molEqkGuthrie and Cullimore, 1980liquid phase; ALS

References

Go To: Top, Reaction thermochemistry data, Notes

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

Fujio, McIver, et al., 1981
Fujio, M.; McIver, R.T., Jr.; Taft, R.W., Effects on the acidities of phenols from specific substituent-solvent interactions. Inherent substituent parameters from gas phase acidities, J. Am. Chem. Soc., 1981, 103, 4017. [all data]

Cumming and Kebarle, 1978
Cumming, J.B.; Kebarle, P., Summary of gas phase measurements involving acids AH. Entropy changes in proton transfer reactions involving negative ions. Bond dissociation energies D(A-H) and electron affinities EA(A), Can. J. Chem., 1978, 56, 1. [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]

Paul and Kebarle, 1991
Paul, G.J.C.; Kebarle, P., Stabilities of Complexes of Br- with Substituted Benzenes (SB) Based on Determinations of the Gas-Phase Equilibria Br- + SB = (BrSB)-, J. Am. Chem. Soc., 1991, 113, 4, 1148, https://doi.org/10.1021/ja00004a014 . [all data]

Moselhy and Pritchard, 1975
Moselhy, G.M.; Pritchard, H.O., The thermochemistry of the chloro-benzoyl chlorides, J. Chem. Thermodyn., 1975, 7, 977-982. [all data]

Carson, Pritchard, et al., 1950
Carson, A.S.; Pritchard, H.O.; Skinner, H.A., The heats of hydrolysis of the benzoyl halides, J. Chem. Soc., 1950, 656-659. [all data]

Davies, Dunning, et al., 1972
Davies, J.V.; Dunning, B.K.; Pritchard, H.O., The enthalpy of formation of benzoyl chloride, J. Chem. Thermodyn., 1972, 4, 731-737. [all data]

Briner and Chastonay, 1954
Briner, E.; Chastonay, P., Etude thermochemique de l'autoxydation de Valdehyde benzoique, Helv. Chim. Acta, 1954, 238, 539-541. [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]

Guthrie and Cullimore, 1980
Guthrie, J.P.; Cullimore, P.A., Effect of the acyl substituent on the equilibrium constant for hydration of esters, Can. J. Chem., 1980, 58, 1281-1294. [all data]


Notes

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