Acetaldehyde

• Formula: C₂H₄O
• Molecular weight: 44.0526
• IUPAC Standard InChI: InChI=1S/C2H4O/c1-2-3/h2H,1H3 Copy

  
• IUPAC Standard InChIKey: IKHGUXGNUITLKF-UHFFFAOYSA-N Copy
• CAS Registry Number: 75-07-0
• 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: Acetic aldehyde; Ethanal; Ethyl aldehyde; CH3CHO; Acetaldehyd; Aldehyde acetique; Aldeide acetica; NCI-C56326; Octowy aldehyd; Acetylaldehyde; Rcra waste number U001; UN 1089; NSC 7594
• Permanent link for this species. Use this link for bookmarking this species for future reference.
• Information on this page:
  • Condensed phase thermochemistry data
  • Reaction thermochemistry data
  • Gas phase ion energetics data
  • References
  • Notes
• Other data available:
  • Gas phase thermochemistry data
  • Phase change data
  • Henry's Law data
  • Ion clustering data
  • IR Spectrum
  • Mass spectrum (electron ionization)
  • UV/Visible spectrum
  • Vibrational and/or electronic energy levels
  • Gas Chromatography
• Data at other public NIST sites:
  • Gas Phase Kinetics Database
• Options:
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• NIST / TRC Web Thermo Tables, professional edition (thermophysical and thermochemical data)

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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 liquid

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
RCD - Robert C. Dunbar

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

C₂H₃O^- +  =

By formula: C₂H₃O^- + H⁺ = C₂H₄O

C₂H₅O⁺ +  = (C₂H₅O⁺ • )

By formula: C₂H₅O⁺ + C₂H₄O = (C₂H₅O⁺ • C₂H₄O)

Bond type: Hydrogen bonds of the type OH-O between organics

C₂H₇O⁺ +  = (C₂H₇O⁺ • )

By formula: C₂H₇O⁺ + C₂H₄O = (C₂H₇O⁺ • C₂H₄O)

Bond type: Hydrogen bonds of the type OH-O between organics

C₂H₅O⁺ +  = (C₂H₅O⁺ • )

By formula: C₂H₅O⁺ + C₂H₄O = (C₂H₅O⁺ • C₂H₄O)

Bond type: Hydrogen bonds of the type OH-O between organics

C₂H₃O^- +  =

By formula: C₂H₃O^- + H⁺ = C₂H₄O

 +  = ( • )

By formula: Cl^- + C₂H₄O = (Cl^- • C₂H₄O)

 +  = ( • )

By formula: C₂H₃O₂^- + C₂H₄O = (C₂H₃O₂^- • C₂H₄O)

Bond type: Hydrogen bonds of deprotonated acids to ketones/

 +  =

By formula: H₂ + C₂H₄O = C₂H₆O

(C₂H₅O^- • 4294967295) +  = C₂H₅O^-

By formula: (C₂H₅O^- • 4294967295C₂H₄O) + C₂H₄O = C₂H₅O^-

 +  = ( • )

By formula: NO^- + C₂H₄O = (NO^- • C₂H₄O)

 +  = ( • )

By formula: Li⁺ + C₂H₄O = (Li⁺ • C₂H₄O)

3 =

By formula: 3C₂H₄O = C₆H₁₂O₃

 +  = ( • )

By formula: Mg⁺ + C₂H₄O = (Mg⁺ • C₂H₄O)

 +  = 2 + 

By formula: C₄H₁₀O₂ + H₂O = 2CH₄O + C₂H₄O

 +  = 2 + 

By formula: C₄H₁₀O₂ + H₂O = 2CH₄O + C₂H₄O

 +  = 2 + 

By formula: C₄H₁₀O₂ + H₂O = 2CH₄O + C₂H₄O

2 +  =  + 

By formula: 2CH₄O + C₂H₄O = C₄H₁₀O₂ + H₂O

 +  =  + 

By formula: C₂H₄O + I₂ = HI + C₂H₃IO

 +  =  + 

By formula: H₂O + C₈H₁₀N₂ = C₆H₈N₂ + C₂H₄O

= 3

By formula: C₆H₁₂O₃ = 3C₂H₄O

 +  = ( • )

By formula: Na⁺ + C₂H₄O = (Na⁺ • C₂H₄O)

 +  = ( • )

By formula: Ag⁺ + C₂H₄O = (Ag⁺ • C₂H₄O)

Gas phase ion energetics data

Go To: Top, Condensed phase thermochemistry data, Reaction thermochemistry data, References, Notes

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
L - Sharon G. Lias

Data compiled as indicated in comments:
B - John E. Bartmess
LBLHLM - Sharon G. Lias, John E. Bartmess, Joel F. Liebman, John L. Holmes, Rhoda D. Levin, and W. Gary Mallard
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 C₂H₄O⁺ (ion structure unspecified)

Electron affinity determinations

Ionization energy determinations

Appearance energy determinations

De-protonation reactions

C₂H₃O^- +  =

By formula: C₂H₃O^- + H⁺ = C₂H₄O

C₂H₃O^- +  =

By formula: C₂H₃O^- + H⁺ = C₂H₄O

References

Go To: Top, Condensed 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.

Wiberg, Crocker, et al., 1991
Wiberg, K.B.; Crocker, L.S.; Morgan, K.M., Thermochemical studies of carbonyl compounds. 5. Enthalpies of reduction of carbonyl groups, J. Am. Chem. Soc., 1991, 113, 3447-3450. [all data]

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Connor, A.Z.; Elving, P.J.; Steingiser, S., Specific heat of acetaldehyde and acetaldehyde dibutyl acetal, J. Am. Chem. Soc., 1947, 69, 1532. [all data]

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Mead, R.D.; Lykke, K.R.; Lineberger, W.C.; Marks, J.; Brauman, J.I., Spectroscopy and Dynamics of the Dipole-Bound State of Acetaldehyde Enolate., J. Chem. Phys., 1984, 81, 11, 4883., https://doi.org/10.1063/1.447515 . [all data]

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Bartmess, J.E.; Scott, J.A.; McIver, R.T., Jr., The gas phase acidity scale from methanol to phenol, J. Am. Chem. Soc., 1979, 101, 6047. [all data]

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Holmes, J.L.; Lossing, F.P., Heats of formation of the ionic and neutral enols of acetaldehyde and acetone, J. Am. Chem. Soc., 1982, 104, 2648. [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]

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Larson, J.W.; McMahon, T.B., Formation, Thermochemistry, and Relative Stabilities of Proton - Bound dimers of Oxygen n - Donor Bases from Ion Cyclotron Resonance Solvent - Exchange Equilibria Measurements, J. Am. Chem. Soc., 1982, 104, 23, 6255, https://doi.org/10.1021/ja00387a016 . [all data]

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Grimsrud, E.P.; Kebarle, P., Gas Phase Ion Equilibria Studies of the Solvation of the Hydrogen Ion by Methanol, Dimethyl Ether and Water. Effect of Hydrogen Bonding, J. Am. Chem. Soc., 1973, 95, 24, 7939, https://doi.org/10.1021/ja00805a002 . [all data]

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Meot-ner, M., Ionic Hydrogen Bond and Ion Solvation. ₆. Interaction Energies of the Acetate Ion with Organic Molecules. Comparison of CH₃COO^- with Cl^-, CN^-, and SH^-, J. Am. Chem. Soc., 1988, 110, 12, 3854, https://doi.org/10.1021/ja00220a022 . [all data]

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Dzidic and Kebarle, 1970
Dzidic, I.; Kebarle, P., Hydration of the Alkali Ions in the Gas Phase. Enthalpies and Entropies of Reactions M+(H2O)n-1 + H2O = M+(H2O)n, J. Phys. Chem., 1970, 74, 7, 1466, https://doi.org/10.1021/j100702a013 . [all data]

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Krasnov, V.L.; Ozherel'eva, N.K.; Trub, E.P.; Tsvetkov, V.G.; Bodrikov, I.V., Trimerization of aldehydes under the action of sulfur dioxide, J. Gen. Chem. USSR, 1983, 53, 2135-2138. [all data]

Busfield, Lee, et al., 1973
Busfield, W.K.; Lee, R.M.; Merifold, D., Gas phase equilibrium between acetaldehyde and paraldehyde, thermodynamic values for the trimerisation of acetaldehyde and the polymerisability of paraldehyde, J. Chem. Soc. Faraday Trans. 1, 1973, 69, 936-940. [all data]

Operti, Tews, et al., 1988
Operti, L.; Tews, E.C.; Freiser, B.S., Determination of Gas-Phase Ligand Binding Energies to Mg+ by FTMS Techniques, J. Am. Chem. Soc., 1988, 110, 12, 3847, https://doi.org/10.1021/ja00220a020 . [all data]

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Birley, G.I.; Skinner, H.A., Enthalpies of hydrolysis of dimethoxymethane and 1,1-dimethoxyethane, Trans. Faraday Soc., 1970, 66, 791-793. [all data]

Wiberg, Morgan, et al., 1994
Wiberg, K.B.; Morgan, K.M.; Maltz, H., Thermochemistry of carbonyl reactions. 6. A study of hydration equilibria, J. Am. Chem. Soc., 1994, 116, 11067-11077. [all data]

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Walsh, R.; Benson, S.W., The heats of formation of acetyl iodide and the acetyl radical, J. Phys. Chem., 1966, 70, 3751-3753. [all data]

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Landrieu, M.Ph., Thermochimie. - Thermochimie des hydrazones, Compt. Rend., 1905, 141, 358-361. [all data]

Armentrout and Rodgers, 2000
Armentrout, P.B.; Rodgers, M.T., An Absolute Sodium Cation Affinity Scale: Threshold Collision-Induced Dissociation Experiments and ab Initio Theory, J. Phys. Chem A, 2000, 104, 11, 2238, https://doi.org/10.1021/jp991716n . [all data]

Ho, Yang, et al., 1997
Ho, Y.-P.; Yang, Y.-C.; Klippenstein, S.J.; Dunbar, R.C., Binding Energies of Ag+ and Cd+ Complexes from Analysis of Radiative Association Kinetics, J. Phys. Chem. A, 1997, 101, 18, 3338, https://doi.org/10.1021/jp9637284 . [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]

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Desfrancois, C.; Abdoul-Carime, H.; Khelifa, N.; Schermann, J.P., Fork 1/r to 1/r2 Potentials: Electron Exchange between Rydberg Atoms and Polar Molecules, Phys. Rev. Lett., 1994, 73, 18, 2436, https://doi.org/10.1103/PhysRevLett.73.2436 . [all data]

Traeger, 1985
Traeger, J.C., Heat of formation for the formyl cation by photoionization mass spectrometry, Int. J. Mass Spectrom. Ion Processes, 1985, 66, 271. [all data]

Traeger, McLouglin, et al., 1982
Traeger, J.C.; McLouglin, R.G.; Nicholson, A.J.C., Heat of formation for acetyl cation in the gas phase, J. Am. Chem. Soc., 1982, 104, 5318. [all data]

El-Sherbini, Allam, et al., 1981
El-Sherbini, T.M.; Allam, S.H.; Migahed, M.D.; Dawoud, A.M., Mass spectrometric investigation of aliphatic aldehydes, Z. Naturforsch. A:, 1981, 36, 1334. [all data]

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Jochims, H.-W.; Lohr, W.; Baumgartel, H., Photoionization mass spectrometry studies of deuterated acetaldehydes CH₃CDO and CD₃CHO, Chem. Phys. Lett., 1978, 54, 594. [all data]

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Staley, R.H.; Wieting, R.D.; Beauchamp, J.L., Carbenium ion stabilities in the gas phase and solution. An ion cyclotron resonance study of bromide transfer reactions involving alkali ions, alkyl carbenium ions, acyl cations and cyclic halonium ions, J. Am. Chem. Soc., 1977, 99, 5964. [all data]

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Dorman, F.H., Fragment ions from CH₃CHO and (CH₃)₂CO by electron impact, J. Chem. Phys., 1965, 42, 65. [all data]

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Burgers, P.C.; Holmes, J.L., Metastable ion studies. XIII. The measurement of appearance energies of metastable peaks, Org. Mass Spectrom., 1982, 17, 123. [all data]

Notes

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

• Symbols used in this document:
  

  AE	Appearance energy
  Cp,liquid	Constant pressure heat capacity of liquid
  EA	Electron affinity
  IE (evaluated)	Recommended ionization energy
  S°liquid	Entropy of liquid at standard conditions
  ΔfH°liquid	Enthalpy of formation of liquid at standard conditions
  ΔrG°	Free energy of reaction at standard conditions
  ΔrH°	Enthalpy of reaction at standard conditions
  ΔrS°	Entropy of reaction at standard conditions

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