2,5-Norbornadiene

• Formula: C₇H₈
• Molecular weight: 92.1384
• IUPAC Standard InChI: InChI=1S/C7H8/c1-2-7-4-3-6(1)5-7/h1-4,6-7H,5H2 Copy

  
• IUPAC Standard InChIKey: SJYNFBVQFBRSIB-UHFFFAOYSA-N Copy
• CAS Registry Number: 121-46-0
• 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: Bicyclo[2.2.1]hepta-2,5-diene; Bicyclo[2.2.1]heptadiene; Norbornadiene; 3,6-Methano-1,4-cyclohexadiene; Dicycloheptadiene; Bicyclo[2.2.1]-2,5-heptadiene; NSC 13672; 8,9,10-trinorborna-2,5-diene
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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
  • Mass spectrum (electron ionization)
  • References
  • Notes
• Other data available:
  • Gas Chromatography
• 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
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
AC - William E. Acree, Jr., James S. Chickos
DRB - Donald R. Burgess, Jr.

Enthalpy of vaporization

Enthalpy of fusion

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:
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
B - John E. Bartmess

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: C₇H₈ = C₇H₈

C₇H₇^- +  =

By formula: C₇H₇^- + H⁺ = C₇H₈

 + 2 =

By formula: C₇H₈ + 2H₂ = C₇H₁₂

=  + 

By formula: C₇H₈ = C₅H₆ + C₂H₂

=

By formula: C₇H₈ = C₇H₈

 +  =

By formula: C₅H₆ + C₂H₂ = C₇H₈

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:
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 C₇H₈⁺ (ion structure unspecified)

Ionization energy determinations

Appearance energy determinations

De-protonation reactions

C₇H₇^- +  =

By formula: C₇H₇^- + H⁺ = C₇H₈

IR Spectrum

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Data compiled by: Coblentz Society, Inc.

• LIQUID; Not specified, most likely a prism, grating, or hybrid spectrometer.; DIGITIZED BY NIST FROM HARD COPY; 4 cm^-1 resolution
• SOLUTION (10% IN CCl4 FOR 4000-1250 CM^-1, 10% IN CS2 FOR 1250-450 CM^-1) VS. SOLVENT; CARY 90 (GRATING); DIGITIZED BY NIST FROM HARD COPY (FROM TWO SEGMENTS); 4 cm^-1 resolution

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

• gas

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

References

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Reaction thermochemistry data, Gas phase ion energetics data, IR Spectrum, Mass spectrum (electron ionization), Notes

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

Walsh R., 1975
Walsh R., The enthalpy of formation of bicyclo[2.2.1]hepta-2,5-diene. Thermodynamic functions of bicyclo[2.2.1]heptane and bicyclo[2.2.1]hepta-2,5-diene, J. Chem. Thermodyn., 1975, 7, 149-154. [all data]

Lenz T.G., 1989
Lenz T.G., Force-field calculations giving accurate conformation, Hf(T), S(T), and Cp(T) for unsaturated acyclic and cyclic hydrocarbons, J. Phys. Chem., 1989, 93, 1588-1592. [all data]

Steele, 1978
Steele, W.V., The standard enthalpies of formation of a series of C₇, bridged-ring hydrocarbons: norbornane, norbornene, nortricyclene, norbornadiene, and quadricyclane, J. Chem. Thermodyn., 1978, 10, 919-927. [all data]

Hall, Smith, et al., 1973
Hall, H.K., Jr.; Smith, C.D.; Baldt, J.H., Enthalpies of formation of norticyclene, norbornene, norbornadiene, and quadricyclane, J. Am. Chem. Soc., 1973, 95, 3197-3201. [all data]

Skuratov, Kozina, et al., 1958
Skuratov, S.M.; Kozina, M.P.; Shtocher, S.M.; Prevalova, N.M.; Kamkina, L.S.; Zuko, V.D., Heats of combustion of cyclic compounds, Bull. Chem. Thermodyn., 1958, 1, 21. [all data]

Weast and Grasselli, 1989
CRC Handbook of Data on Organic Compounds, 2nd Editon, Weast,R.C and Grasselli, J.G., ed(s)., CRC Press, Inc., Boca Raton, FL, 1989, 1. [all data]

Buckingham and Donaghy, 1982
Buckingham, J.; Donaghy, S.M., Dictionary of Organic Compounds: Fifth Edition, Chapman and Hall, New York, 1982, 1. [all data]

Turner, Meador, et al., 1957
Turner, R.B.; Meador, W.R.; Winkler, R.E., Heats of Hydrogenation I. Apparatus and the Heats of Hydrogenation of Bicyclo[2.2.1]heptene, Bicyclo[2.2.1]heptadiene, Bicyclo[2.2.2]octene, and Bicyclo[2.2.2]octadiene, J. Am. Chem. Soc., 1957, 79, 4116. [all data]

Brooks and Pilcher, 1959
Brooks, J.H.; Pilcher, G., A Simple Melting Point Calorimeter for Moderately Precise Determination of Purity, J. Chem. Soc., 1959, 1959, 1535. [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]

Bykova, Smirnova, et al., 2004
Bykova, T.A.; Smirnova, N.N.; Nikishchenkova, L.V.; Belov, G.P.; Novikova, E.V., Zh. Fiz. Khim., 2004, 78, 11, 1944. [all data]

Lee and Squires, 1986
Lee, R.E.; Squires, R.R., Anionic homoaromaticity: A gas phase experimental study, J. Am. Chem. Soc., 1986, 105, 5078. [all data]

Wright and Beauchamp, 1981
Wright, C.A.; Beauchamp, J.L., Infrared spectra of gas phase ions and their use in elucidating reaction mechanisms. Identification of C₇H₇- structural isomers by multiphoton electron detachment using a low-powered laser, J. Am. Chem. Soc., 1981, 103, 6499. [all data]

Doering, Roth, et al., 1988
Doering, W.E.; Roth, W.R.; Breuckmann, R.; Figge, L.; Lennartz, H.-W.; Fessner, W.-D.; Prinzbach, F.H., Verbotene Reaktionen. - [2 + 2]-Cycloreversion starrer Cyclobutane, Chem. Ber., 1988, 121, 1-9. [all data]

Rogers, Choi, et al., 1980
Rogers, D.W.; Choi, L.S.; Girellini, R.S., Heats of hydrogenation and formation of quadricyclene, norbornadiene, norbornene, and nortricyclene, J. Phys. Chem., 1980, 84, 1810-1814. [all data]

Turner, Meador, et al., 1957, 2
Turner, R.B.; Meador, W.R.; Winkler, R.E., Heats of hydrogenation. I. Apparatus and the heats of hydrogenation of bicyclo[2,2,1]heptene, bicyclo[2,2,1]heptadiene, bicyclo[2,2,2]octene and bicyclo[2,2,2]octadiene, J. Am. Chem. Soc., 1957, 79, 4116-4121. [all data]

Walsh and Wells, 1975
Walsh, R.; Wells, J.M., The enthalpy of formation of bicyclo[2,2,1]hepta-2,5-diene. Thermodynamic functions of bicyclo[2,2,1]heptane and bicyclo[2,2,1]hepta-2,5-diene, J. Chem. Thermodyn., 1975, 7, 149-154. [all data]

Pedley, Naylor, et al., 1986
Pedley, J.B.; Naylor, R.D.; Kirby, S.P., Thermochemical Data of Organic Compounds, Chapman and Hall, New York, 1986, 1-792. [all data]

Harel, Adamson, et al., 1987
Harel, Y.; Adamson, A.W.; Kutal, C.; Grutsch, P.A.; Yasufuku, K., Photocalorimetry. 6. Enthalpies of isomerization of norbornadiene and of substituted norbornadienes to corresponding quadricyclenes, J. Phys. Chem., 1987, 91, 901-904. [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]

Ohno, Ishide, et al., 1985
Ohno, K.; Ishide, T.; Naitoh, Y.; Izumi, Y., Study of stereochemical properties of molecular orbitals by penning ionization electron spectroscopy, J. Am. Chem. Soc., 1985, 107, 8082. [all data]

Traeger and McLoughlin, 1978
Traeger, J.C.; McLoughlin, R.G., A photoionization study of the energetics of C₇H₇⁺ ion formed from C₇H₈ precursors, Int. J. Mass Spectrom. Ion Phys., 1978, 27, 319. [all data]

Demeo and Yencha, 1970
Demeo, D.A.; Yencha, A.J., Photoelectron spectra of bicyclic and exocyclic olefins, J. Chem. Phys., 1970, 53, 4536. [all data]

Demeo and El-Sayed, 1970
Demeo, D.A.; El-Sayed, M.A., Ionization potential and structure of olefins, J. Chem. Phys., 1970, 52, 2622. [all data]

Houk, Rondan, et al., 1983
Houk, K.N.; Rondan, N.G.; Paddon-Row, M.N.; Jefford, C.W.; Huy, P.T.; Burrow, P.D.; Jordan, K.D., Ionization potentials, electron affinities, and molecular orbitals of 2-substituted norbornadienes. Theory of 1,2 and homo-1,4 carbene cycloaddition selectivities, J. Am. Chem. Soc., 1983, 105, 5563. [all data]

Bieri, Asbrink, et al., 1982
Bieri, G.; Asbrink, L.; Von Niessen, W., 30.4-nm He(II) photoelectron spectra of organic molecules, J. Electron Spectrosc. Relat. Phenom., 1982, 27, 129. [all data]

Worley and Webb, 1980
Worley, S.D.; Webb, T.R., The electronic structure of transition-metal carbonyl complexes of norbornadiene and mesitylene, J. Organomet. Chem., 1980, 192, 139. [all data]

Worley, Webb, et al., 1979
Worley, S.D.; Webb, T.R.; Gibson, D.H.; Ong, T.-S., On the electronic structures of cyclobutadiene trimethylenemethane, J. Organomet. Chem., 1979, 168, 16. [all data]

Kobayashi, 1978
Kobayashi, T., A new rule for photoelectron angular distributions of molecules, Phys. Lett. A, 1978, 69, 31. [all data]

Cowling, Johnstone, et al., 1973
Cowling, S.A.; Johnstone, R.A.W.; Gorman, A.A.; Smith, P.G., Photoelectron spectrum of 5-methylenenorborn-2-ene and through-space interactions (homobutadiene conjugation), J. Chem. Soc., Chem. Commun., 1973, 627. [all data]

Palmer and Findlay, 1972
Palmer, M.H.; Findlay, R.H., Ab initio molecular orbital calculations, the electronic structure and electron spectrum of norbornadiene, Chem. Phys. Lett., 1972, 15, 416. [all data]

Heilbronner and Martin, 1972
Heilbronner, E.; Martin, H.D., The π-orbital sequence in norbornadiene and related hydrocarbons, Helv. Chim. Acta, 1972, 55, 1490. [all data]

Bischof, Heilbronner, et al., 1971
Bischof, P.; Heilbronner, E.; Prinzbach, H.; Martin, H.D., A photoelectron-spectroscopic investigation of the homoconjugative interaction between π- and Walsh-orbitals in endo- and exo- cyclopropano-norbornene, Helv. Chim. Acta, 1971, 54, 1072. [all data]

Dolejsek, Hanus, et al., 1962
Dolejsek, Z.; Hanus, V.; Prinzbach, H., Das massenspektrometrische Verhalten von Quadricyclen, Angew. Chem., 1962, 74, 902. [all data]

Meyerson, McCollum, et al., 1961
Meyerson, S.; McCollum, J.D.; Rylander, P.N., Organic ions in the gas phase. VIII. Bicycloheptadiene, J. Am. Chem. Soc., 1961, 83, 1401. [all data]

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, Mass spectrum (electron ionization), 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
  Tboil	Boiling point
  Tfus	Fusion (melting) point
  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
  ΔfusH	Enthalpy of fusion
  ΔrG°	Free energy of reaction at standard conditions
  ΔrH°	Enthalpy of reaction at standard conditions
  ΔvapH	Enthalpy of vaporization
  ΔvapH°	Enthalpy of vaporization at standard conditions

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