2-Thiophenecarboxylic acid, 5-methyl-

• Formula: C₆H₆O₂S
• Molecular weight: 142.176
• IUPAC Standard InChI: InChI=1S/C6H6O2S/c1-4-2-3-5(9-4)6(7)8/h2-3H,1H3,(H,7,8) Copy

  
• IUPAC Standard InChIKey: VCNGNQLPFHVODE-UHFFFAOYSA-N Copy
• CAS Registry Number: 1918-79-2
• Chemical structure:
  This structure is also available as a 2d Mol file or as a computed 3d SD file
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• Other names: 2-Carboxy-5-methylthiophene; 2-Methyl-5-thiophenecarboxylic acid; 5-Methyl-2-thiophenecarboxylic acid; 5-Methyl-2-thiophenecaroboxylic acid; 5-Methylthiophen-2-carboxylic acid; 5-Methyl-2-thiophenecarboxylic acid (keto form); 5-methylthiophene-2-carboxylic acid
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• Information on this page:
  • Phase change data
  • IR Spectrum
  • Mass spectrum (electron ionization)
  • Gas Chromatography
  • References
  • Notes
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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 by: William E. Acree, Jr., James S. Chickos

Enthalpy of sublimation

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: Coblentz Society, Inc.

Condensed Phase Spectrum

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Notice: Except where noted, spectra from this collection were measured on dispersive instruments, often in carefully selected solvents, and hence may differ in detail from measurements on FTIR instruments or in other chemical environments. More information on the manner in which spectra in this collection were collected can be found here.

Notice: Concentration information is not available for this spectrum and, therefore, molar absorptivity values cannot be derived.

Additional Data

Mass spectrum (electron ionization)

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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

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

Normal alkane RI, non-polar column, temperature ramp

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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.

Ribeiro da Silva and Santos, 2008
Ribeiro da Silva, Manuel A.V.; Santos, Ana Filipa L.O.M., Thermochemical properties of three 2-thiophenecarboxylic acid derivatives, The Journal of Chemical Thermodynamics, 2008, 40, 9, 1451-1457, https://doi.org/10.1016/j.jct.2008.04.013 . [all data]

Tai and Ho, 1998
Tai, C.-Y.; Ho, C.-T., Influence of glutathione oxidation and pH on thermal formation of Maillard-type volatile compounds, J. Agric. Food Chem., 1998, 46, 6, 2260-2265, https://doi.org/10.1021/jf971111t . [all data]

Notes

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• Symbols used in this document:
  

  ΔsubH	Enthalpy of sublimation
  ΔsubH°	Enthalpy of sublimation at standard conditions

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