Cyclopentane, 1,2-dibromo,trans-
- Formula: C5H8Br2
- Molecular weight: 227.925
- IUPAC Standard InChI: InChI=1S/C5H8Br2/c6-4-2-1-3-5(4)7/h4-5H,1-3H2/t4-,5-/m1/s1
- IUPAC Standard InChIKey: LJCGLSZQABMYGU-RFZPGFLSSA-N
- CAS Registry Number: 10230-26-9
- 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. - Stereoisomers:
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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 as indicated in comments:
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
AC - William E. Acree, Jr., James S. Chickos
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔvapH° | 11.428 | kcal/mol | V | Lister, 1941 | Halogenation at 27 C; ALS |
Enthalpy of vaporization
| ΔvapH (kcal/mol) | Temperature (K) | Method | Reference | Comment |
|---|---|---|---|---|
| 11.4 | 288. | A | Stephenson and Malanowski, 1987 | Based on data from 273. to 332. K. See also Lister, 1941.; AC |
Reaction thermochemistry data
Go To: Top, Phase change data, Gas phase ion energetics data, References, Notes
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
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Individual Reactions
+
=
By formula: C5H8 + Br2 = C5H8Br2
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | -28.61 ± 0.60 | kcal/mol | Cm | Lister, 1941 | gas phase; Halogenation at 27 C |
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 compiled as indicated in comments:
LLK - Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi
Ionization energy determinations
| IE (eV) | Method | Reference | Comment |
|---|---|---|---|
| 10.08 ± 0.02 | PE | Botter, Menes, et al., 1973 | LLK |
| 10.04 | PE | Gounelle, Menard, et al., 1975 | Vertical value; LLK |
References
Go To: Top, Phase change 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.
Lister, 1941
Lister, M.W.,
Heats of organic reactions. X. Heats of bromination of cyclic olefins,
J. Am. Chem. Soc., 1941, 63, 143-149. [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]
Botter, Menes, et al., 1973
Botter, R.; Menes, F.; Gounelle, Y.; Pechine, J.M.; Solgadi, D.,
The ionization potentials of geometrical isomers: the cis and trans 2-subststituted cyclopentyl and cyclohexyl bromides,
Int. J. Mass Spectrom. Ion Phys., 1973, 12, 188. [all data]
Gounelle, Menard, et al., 1975
Gounelle, Y.; Menard, C.; Pechine, J.M.; Solgadi, D.; Menes, F.; Botter, R.,
Conformational effects on ionization potentials; Photoelectron spectra of dibromo- and bromofluoro- alkyl compounds,
J. Electron Spectrosc. Relat. Phenom., 1975, 7, 247. [all data]
Notes
Go To: Top, Phase change data, Reaction thermochemistry data, Gas phase ion energetics data, References
- Symbols used in this document:
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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