Tetrahydropyran

• Formula: C₅H₁₀O
• Molecular weight: 86.1323
• IUPAC Standard InChI: InChI=1S/C5H10O/c1-2-4-6-5-3-1/h1-5H2 Copy

  
• IUPAC Standard InChIKey: DHXVGJBLRPWPCS-UHFFFAOYSA-N Copy
• CAS Registry Number: 142-68-7
• 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: Oxacyclohexane; Oxane; 2H-Pyran, tetrahydro-; Pentamethylene oxide; Tetrahydro-2H-pyran; THP
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• Information on this page:
  • Gas phase thermochemistry data
  • Condensed phase thermochemistry data
  • Phase change data
  • Reaction thermochemistry data
  • Gas phase ion energetics data
  • IR Spectrum
  • UV/Visible spectrum
  • Gas Chromatography
  • References
  • Notes
• Other data available:
  • Henry's Law data
  • Mass spectrum (electron ionization)
• 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 as indicated in comments:
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
GT - Glushko Thermocenter, Russian Academy of Sciences, Moscow

Constant pressure heat capacity of gas

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

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
DRB - Donald R. Burgess, Jr.
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein

Enthalpy of vaporization

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 by: 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

 +  =

By formula: C₅H₈O + H₂ = C₅H₁₀O

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 evaluated as indicated in comments:
HL - Edward P. Hunter and Sharon G. Lias
L - Sharon G. Lias

Data compiled as indicated in comments:
MM - Michael M. Meot-Ner (Mautner)
LL - Sharon G. Lias and Joel F. Liebman
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 C₅H₁₀O⁺ (ion structure unspecified)

Gas basicity at 298K

Ionization energy determinations

Appearance energy determinations

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

UV/Visible 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: Victor Talrose, Eugeny B. Stern, Antonina A. Goncharova, Natalia A. Messineva, Natalia V. Trusova, Margarita V. Efimkina

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

Kovats' RI, non-polar column, isothermal

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Kovats' RI, polar column, isothermal

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Normal alkane RI, non-polar column, isothermal

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

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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.

Pell and Pilcher, 1965
Pell, A.S.; Pilcher, G., Measurements of heats of combustion by flame calorimetry. Part 3.-Ethylene oxide, trimethylene oxide, tetrahydrofuran and tetrahydropy, Trans. Faraday Soc., 1965, 61, 71-77. [all data]

Snelson and Skinner, 1961
Snelson, A.; Skinner, H.A., Heats of combustion: sec-propanol, 1,4-dioxan, 1,3-dioxan and tetrahydropyran, Trans. Faraday Soc., 1961, 57, 2125-2131. [all data]

Cass, Fletcher, et al., 1958
Cass, R.C.; Fletcher, S.E.; Mortimer, C.T.; Springall, H.D.; White, T.R., Heats of combustion and molecular structure. Part V. The mean bond energy term for the C-O bond in ethers, and the structures of some cyclic ethers, J. Chem. Soc., 1958, 1406-1410. [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]

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Dorofeeva O.V., Ideal gas thermodynamic properties of oxygen heterocyclic compounds. Part 2. Six-membered, seven-membered and eight-membered rings, Thermochim. Acta, 1992, 200, 121-150. [all data]

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Conti, Gianni, et al., 1976
Conti, G.; Gianni, P.; Matteoli, E.; Mengheri, M., Capacita termiche molari di alcuni composti organici mono- e bifunzionali nel liquido puro e in soluzione acquosa a 25C, Chim. Ind. (Milan), 1976, 58, 225. [all data]

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Moelwyn-Hughes, E.A.; Thorpe, P.L., The physical and thermodynamic properties of some associated solutions. II. Heat capacities and compressibilities, Proc. Roy. Soc. (London), 1964, 278A, 574-587. [all data]

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Anonymous, 1942
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Kobe and Mathews, 1970
Kobe, K.A.; Mathews, J.F., Critical Properties and Vapor Pressures of Some Organic Nitrogen and Oxygen Compounds, J. Chem. Eng. Data, 1970, 15, 182. [all data]

Majer and Svoboda, 1985
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Rojas-Aguilar, Ginez-Carbajal, et al., 2005
Rojas-Aguilar, A.; Ginez-Carbajal, F.; Orozco-Guareno, E.; Flores-Segura, H., Measurement of enthalpies of vaporization of volatile heterocyclic compounds by DSC, J Therm Anal Calorim, 2005, 79, 1, 95-100, https://doi.org/10.1007/s10973-004-0568-3 . [all data]

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Rodríguez, S.; Giner, B.; Haro, M.; Martín, S.; Artigas, H., Isobaric vapour--liquid equilibrium for the binary systems formed by a cyclic ether and bromocyclohexane at 40.0 and 101.3 kPa, Physics and Chemistry of Liquids, 2006, 44, 3, 275-285, https://doi.org/10.1080/00319100600574168 . [all data]

Rodriguez, Artigas, et al., 2000
Rodriguez, S.; Artigas, H.; Lafuente, C.; Mainar, A.M.; Royo, F.M., Isobaric vapour--liquid equilibrium of binary mixtures of some cyclic ethers with chlorocyclohexane at 40.0 and 101.3 kPa, Thermochimica Acta, 2000, 362, 1-2, 153-160, https://doi.org/10.1016/S0040-6031(00)00580-3 . [all data]

Stephenson and Malanowski, 1987
Stephenson, Richard M.; Malanowski, Stanislaw, Handbook of the Thermodynamics of Organic Compounds, 1987, https://doi.org/10.1007/978-94-009-3173-2 . [all data]

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Dykyj, J., Petrochemia, 1972, 12, 1, 13. [all data]

Cass, Fletcher, et al., 1958, 2
Cass, R.C.; Fletcher, S.E.; Mortimer, C.T.; Quincey, P.G.; Springall, H.D., 193. Heats of combustion and molecular structure. Part IV. Aliphatic nitroalkanes and nitric esters, J. Chem. Soc., 1958, 958, https://doi.org/10.1039/jr9580000958 . [all data]

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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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Decouzon, M.; Gal, J.E.; Herreros, M.; Marai, P.C.; Murrell, J.; Todd, J.F.J., On the Use of the Kinetic Method for the Determination of Proton Affinities by Fourier-Transfrom Ion Cyclotron Resonance Mass Spectrometry, Rapid. Comm. Mass Spectrom., 1996, 10, 242. [all data]

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Hernandez, G.J., Vacuum-ultraviolet absorption spectra of the cyclic ethers: trimethylene oxide, tetrahydrofuran, and tetrahydropyran, J. Chem. Phys., 1963, 38, 2233. [all data]

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Kimura, K.; Katsumata, S.; Achiba, Y.; Yamazaki, T.; Iwata, S., Ionization energies, Ab initio assignments, and valence electronic structure for 200 molecules in Handbook of HeI Photoelectron Spectra of Fundamental Organic Compounds, Japan Scientific Soc. Press, Tokyo, 1981. [all data]

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Notes

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

• Symbols used in this document:
  

  AE	Appearance energy
  Cp,gas	Constant pressure heat capacity of gas
  Cp,liquid	Constant pressure heat capacity of liquid
  IE (evaluated)	Recommended ionization energy
  Pc	Critical pressure
  Tboil	Boiling point
  Tc	Critical temperature
  Tfus	Fusion (melting) point
  ΔcH°gas	Enthalpy of combustion of gas at standard conditions
  ΔcH°liquid	Enthalpy of combustion of liquid at standard conditions
  ΔfH°gas	Enthalpy of formation of gas at standard conditions
  ΔfH°liquid	Enthalpy of formation of liquid at standard conditions
  ΔrH°	Enthalpy of reaction at standard conditions
  ΔvapH	Enthalpy of vaporization
  ΔvapH°	Enthalpy of vaporization at standard conditions
  ρc	Critical density

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