Acetylacetone

• Formula: C₅H₈O₂
• Molecular weight: 100.1158
• IUPAC Standard InChI: InChI=1S/C5H8O2/c1-4(6)3-5(2)7/h3H2,1-2H3 Copy

  
• IUPAC Standard InChIKey: YRKCREAYFQTBPV-UHFFFAOYSA-N Copy
• CAS Registry Number: 123-54-6
• 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: 2,4-Pentanedione; Acetoacetone; Diacetylmethane; Pentane-2,4-dione; 2-Propanone, acetyl-; 2,4-Dioxopentane; 2,4-Pentadione; CH3COCH2COCH3; Acetone, acetyl-; ACAC; Pentanedione; Pentanedione-2,4; Acetyl 2-propanone; UN 2310; 2,4-Pentandione; Pentan-2,4-dione; NSC 5575
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• Information on this page:
  • Gas phase thermochemistry data
  • Reaction thermochemistry data
  • IR Spectrum
  • Gas Chromatography
  • References
  • Notes
• Other data available:
  • Condensed phase thermochemistry data
  • Phase change data
  • Gas phase ion energetics data
  • Ion clustering data
  • Mass spectrum (electron ionization)
  • UV/Visible spectrum
• Data at other public NIST sites:
  • Gas Phase Kinetics Database
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Gas 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 by: Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein

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
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
M - Michael M. Meot-Ner (Mautner) and Sharon G. Lias

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

C₅H₇O₂^- +  =

By formula: C₅H₇O₂^- + H⁺ = C₅H₈O₂

=

By formula: C₅H₈O₂ = C₅H₈O₂

 +  = ( • )

By formula: Cl^- + C₅H₈O₂ = (Cl^- • C₅H₈O₂)

Free energy of reaction

 +  = ( • )

By formula: I^- + C₅H₈O₂ = (I^- • C₅H₈O₂)

=

By formula: C₅H₈O₂ = C₆H₁₀O₃

=

By formula: C₅H₈O₂ = C₅H₈O₂

IR Spectrum

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Data compiled by: Coblentz Society, Inc.

• VAPOR (9 MICROLITER AT 150 C); PERKIN-ELMER 180; DIGITIZED BY NIST FROM HARD COPY (FROM TWO SEGMENTS); 2-3 CM^-1 cm^-1 resolution

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

• gas

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

Kovats' RI, non-polar column, isothermal

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

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Van Den Dool and Kratz RI, non-polar column, custom temperature program

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Van Den Dool and Kratz RI, polar column, custom temperature program

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Normal alkane RI, non-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

Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry data, IR Spectrum, Gas Chromatography, Notes

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

Hacking and Pilcher, 1979
Hacking, J.M.; Pilcher, G., Enthalpy of combustion of pentane-2,4-dione, J. Chem. Thermodyn., 1979, 11, 1015-1017. [all data]

Conrath, Van de Sande, et al., 1974
Conrath, k.; Van de Sande, C.; Vandewalle, M., Studies in organic mass spectrometry. XVI. A combined approach to the structures of ions generated from the molecular ions of acyclic β-diketones through loss of small neutral molecules, Org. Mass Spectrom., 1974, 9, 585-593. [all data]

Melia and Merrifield, 1969
Melia, T.P.; Merrifield, R., Thermal properties of acetylacetone, J. Appl. Chem., 1969, 19, 79-82. [all data]

Taft and Bordwell, 1988
Taft, R.W.; Bordwell, F.G., Structural and Solvent Effects Evaluated from Acidities Measured in Dimethyl Sulfoxide and in the Gas Phase, Acc. Chem. Res., 1988, 21, 12, 463, https://doi.org/10.1021/ar00156a005 . [all data]

Strohmeier and Höhne, 1952
Strohmeier, W.; Höhne, I., Keto-Enol-Umwandlung des Acetylacteons in Gaszustand, Z. Naturfor., 1952, 7B, 184. [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]

Folkendt, Weiss-Lopez, et al., 1989
Folkendt, M.M.; Weiss-Lopez, B.E.; Chauvel, J.P., Jr.; True, N.S., Gas-Phase 1H NMR Studies of Keto-Enol Tautomerization of Acetylacetone, Methyl Acetoacetate, and Ethyl Acetoacetate, J. Phys. Chem., 1989, 89, 15, 3347, https://doi.org/10.1021/j100261a038 . [all data]

Irikura, 1999
Irikura, K.K., Acetylacetonate (acac) anion in the gas phase: predicted structures, vibrational spectra, and photodetachment energies, Int. J. Mass Spectrom., 1999, 187, 577-587, https://doi.org/10.1016/S1387-3806(98)14192-1 . [all data]

Schweig, Vermeer, et al., 1974
Schweig, A.; Vermeer, H.; Weidner, U., A photoelectron spectroscopic study of keto-enol tautomerism in acetylacetones - a new application of photoelectron spectroscopy, Chem. Phys. Lett., 1974, 26, 229-233. [all data]

Thompson and Allred, 1971
Thompson, D.W.; Allred, A.L., Keto-enol equilibria in 2,4-Pentanedione and 3,3-dideuterio-2,4-pentanedione, J. Phys. Chem., 1971, 75, 433-435. [all data]

Calmon, 1969
Calmon, J.P., Thermodynamic functions of enolization of aliphatic β-diketones, C. R. Acad. Sci. Paris, 1969, 268, 1435-1438. [all data]

French, Ikuta, et al., 1982
French, M.A.; Ikuta, S.; Kebarle, P., Hydrogen bonding of O-H and C-H hydrogen donors to Cl^-. Results from mass spectrometric measurement of the ion-molecule equilibria RH + Cl^- = RHCl^-, Can. J. Chem., 1982, 60, 1907. [all data]

Caldwell, Masucci, et al., 1989
Caldwell, G.W.; Masucci, J.A.; Ikonomou, M.G., Negative Ion Chemical Ionization Mass Spectrometry - Binding of Molecules to Bromide and Iodide Anions, Org. Mass Spectrom., 1989, 24, 1, 8, https://doi.org/10.1002/oms.1210240103 . [all data]

Folkendt, Weiss-Lopez, et al., 1985
Folkendt, M.M.; Weiss-Lopez, B.E.; Chauvel, J.P., Jr.; True, N.S., Gas-phase ¹H NMR studies of keto-enol tautomerism of acetylacetone, methyl acetoacetate, and ethyl acetoacetate, J. Phys. Chem., 1985, 89, 3347-3352. [all data]

Mines and Thompson, 1975
Mines, G.W.; Thompson, H., Infrared and photoelectron spectra, and keto-enol tautomerism of acetylacetones and acetoacetic esters, Proc. Roy. Soc. London A, 1975, 342, 327-339. [all data]

Mijin and Antonovic, 2004
Mijin, D.Z.; Antonovic, D.G., Temperature dependence of the Kovats retention indices for alkyl 1,3-diketones on a DB-5 capillary column, J. Serb. Chem. Soc., 2004, 69, 10, 759-767, https://doi.org/10.2298/JSC0410759M . [all data]

Tiess, 1984
Tiess, D., Gaschromatographische Retentionsindices von 125 leicht- bis mittelflüchtigen organischen Substanzen toxikologisch-analytischer Relevanz auf SE-30, Wiss. Z. Wilhelm-Pieck-Univ. Rostock Math. Naturwiss. Reihe, 1984, 33, 6-9. [all data]

Bogoslovsky, Anvaer, et al., 1978
Bogoslovsky, Yu.N.; Anvaer, B.I.; Vigdergauz, M.S., Chromatographic constants in gas chromatography (in Russian), Standards Publ. House, Moscow, 1978, 192. [all data]

Haken, Ho, et al., 1975
Haken, J.K.; Ho, D.K.M.; Vaughan, C.E., Gas chromatography of homologous esters. VII. The retention behaviour of pyruvate esters and related carbonyl and carboxyl compounds, J. Chromatogr., 1975, 106, 2, 317-325, https://doi.org/10.1016/S0021-9673(00)93839-1 . [all data]

Vernon and Edwards, 1975
Vernon, F.; Edwards, G.T., Gas-liquid chromatography on fluorinated stationary phases. II. Fluorinated compounds containing a functional group, J. Chromatogr., 1975, 114, 1, 87-93, https://doi.org/10.1016/S0021-9673(00)85245-0 . [all data]

Pino, Mesa, et al., 2005
Pino, J.A.; Mesa, J.; Muñoz, Y.; Martí, M.P.; Marbot, R., Volatile components from mango (Mangifera indica L.) cultivars, J. Agric. Food Chem., 2005, 53, 6, 2213-2223, https://doi.org/10.1021/jf0402633 . [all data]

Whitfield and Mottram, 1999
Whitfield, F.B.; Mottram, D.S., Investigation of the reaction between 4-hydroxy-5-methyl-3(2H)-furanone and cysteine or hydrogen sulfide at pH 4.5, J. Agric. Food Chem., 1999, 47, 4, 1626-1634, https://doi.org/10.1021/jf980980v . [all data]

Madruga and Mottram, 1998
Madruga, M.S.; Mottram, D.S., The effect of pH on the formation of volatile compounds produced by heating a model system containing 5'-imp and cysteine, J. Braz. Chem. Soc., 1998, 9, 3, 261-271, https://doi.org/10.1590/S0103-50531998000300010 . [all data]

Kuo and Ho, 1992
Kuo, M.-C.; Ho, C.-T., Volatile constituents of the solvent extracts of Welsh onions (Allium fistulosum L. variety Maichuon) and scallions (A. fistulosum L. variety caepitosum), J. Agric. Food Chem., 1992, 40, 10, 1906-1910, https://doi.org/10.1021/jf00022a036 . [all data]

Zhang and Ho, 1991
Zhang, Y.; Ho, C.-T., Formation of meatlike aroma compounds from thermal reaction of inosine 5'-monophosphate with cysteine and glutathione, J. Agric. Food Chem., 1991, 39, 6, 1145-1148, https://doi.org/10.1021/jf00006a031 . [all data]

Zhang and Ho, 1991, 2
Zhang, Y.; Ho, C.-T., Comparison of the volatile compounds formed from the thermal reaction of glucose with cysteine and glutathione, J. Agric. Food Chem., 1991, 39, 4, 760-763, https://doi.org/10.1021/jf00004a029 . [all data]

Flath, Light, et al., 1990
Flath, R.A.; Light, D.M.; Jang, E.B.; Mon, T.R.; John, J.O., Headspace Examination of Volatile Emissions from Ripening Papaya (Carica papaya L., Solo Variety), J. Agric. Food Chem., 1990, 38, 4, 1060-1063, https://doi.org/10.1021/jf00094a032 . [all data]

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Parker, J.K.; Hassell, G.M.E.; Mottram, D.S.; Guy, R.C.E., Sensory and instrumental analyses of volatiles generated during the extrusion cooking of oat flours, J. Agric. Food Chem., 2000, 48, 8, 3497-3506, https://doi.org/10.1021/jf991302r . [all data]

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Leffingwell and Alford, 2011
Leffingwell, J.; Alford, E.D., Volatile constituents of the giant pufball mushroom (Calvatia gigantea), Leffingwell Rep., 2011, 4, 1-17. [all data]

Radulovic, Blagojevic, et al., 2010
Radulovic, N.; Blagojevic, P.; Palic, R., Comparative study of the leaf volatiles of Arctostaphylos uva-ursi (L.) Spreng. and Vaccinium vitis-idaea L. (Ericaceae), Molecules, 2010, 15, 9, 6168-6185, https://doi.org/10.3390/molecules15096168 . [all data]

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Frerot, E.; Velluz, A.; Bagnoud, A.; Delort, E., Analysis of the volatile constituents of cooked petai beans (Parkia speciosa) using high-resolution GC/TOF-MS, Flav. Fragr. J., 2008, 23, 6, 434-440, https://doi.org/10.1002/ffj.1902 . [all data]

Pino, Marbot, et al., 2003
Pino, J.A.; Marbot, R.; Fuentes, V., Characterization of volatiles in Bullock's heart (Annona reticulata L.) fruit cultivars from Cuba, J. Agric. Food Chem., 2003, 51, 13, 3836-3839, https://doi.org/10.1021/jf020733y . [all data]

Chen, 2008
Chen, H.-F., Quantitative prediction of gas chromatography retention indices with support vector machines, radial basis neutral networks and multiple linear regression, Anal. Chim. Acta, 2008, 609, 1, 24-36, https://doi.org/10.1016/j.aca.2008.01.003 . [all data]

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Flanagan, R.J.; Streete, P.J.; Ramsey, J.D., Volatile Substance Abuse, UNODC Technical Series, No 5, United Nations, Office on Drugs and Crime, Vienna International Centre, PO Box 500, A-1400 Vienna, Austria, 1997, 56, retrieved from http://www.odccp.org/pdf/technical_series₁997-01-01₁.pdf. [all data]

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Strete, P.J.; Ruprah, M.; Ramsey, J.D.; Flanagan, R.J., Detection and identification of volatile substances by headspace capillary gas chromatography to aid the diagnosis of acute poisoning, Analyst, 1992, 117, 7, 1111-1127, https://doi.org/10.1039/an9921701111 . [all data]

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Ramsey and Flanagan, 1982
Ramsey, J.D.; Flanagan, R.J., Detection and Identification of Volatile Organic Compounds in Blood by Headspace Gas Chromatography as an Aid to the Diagnosis of Solvent Abuse, J. Chromatogr., 1982, 240, 2, 423-444, https://doi.org/10.1016/S0021-9673(00)99622-5 . [all data]

Kiss, Csoka, et al., 2011
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Seifert and King, 1982
Seifert, R.M.; King, A.D., Jr., Identification of some volatile constituents of Aspergillus clavatus, J. Agric. Food Chem., 1982, 30, 4, 786-790, https://doi.org/10.1021/jf00112a044 . [all data]

Notes

Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry data, IR Spectrum, Gas Chromatography, References

• Symbols used in this document:
  

  T	Temperature
  ΔfH°gas	Enthalpy of formation of gas at standard conditions
  ΔrG°	Free energy of reaction at standard conditions
  ΔrH°	Enthalpy of reaction at standard conditions

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