[18]-Annulene
- Formula: C18H18
- Molecular weight: 234.3355
- IUPAC Standard InChI: InChI=1S/C18H18/c1-2-4-6-8-10-12-14-16-18-17-15-13-11-9-7-5-3-1/h1-18H/b2-1-,3-1+,4-2+,5-3+,6-4+,7-5-,8-6-,9-7+,10-8+,11-9+,12-10+,13-11-,14-12-,15-13+,16-14+,17-15+,18-16+,18-17-
- IUPAC Standard InChIKey: STQWAGYDANTDNA-DWSNDWDZSA-N
- CAS Registry Number: 2040-73-5
- 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: (1,3,5,7,9,11,13,15,17)-Cyclooctadecanonaene
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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 by: Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔfH°solid | 39.0 ± 4.0 | kcal/mol | Ccb | Beezer, Mortimer, et al., 1965 | |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔcH°solid | -2346.8 ± 4.0 | kcal/mol | Ccb | Beezer, Mortimer, et al., 1965 | Corresponding ΔfHºsolid = 39.0 kcal/mol (simple calculation by NIST; no Washburn corrections) |
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
DRB - Donald R. Burgess, Jr.
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔsubH° | 28. ± 2. | kcal/mol | E | Beezer, Mortimer, et al., 1965 | ALS |
| ΔsubH° | 27.96 | kcal/mol | N/A | Beezer, Mortimer, et al., 1965 | DRB |
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.
Beezer, Mortimer, et al., 1965
Beezer, A.E.; Mortimer, C.T.; Springall, H.D.; Sondheimer, F.; Wolovsky, R.,
33. The heat of combustion of cyclo-octadecanonaene ([18]annulene),
J. Chem. Soc., 1965, 216-220. [all data]
Notes
Go To: Top, Condensed phase thermochemistry data, Phase change data, References
- Symbols used in this document:
ΔcH°solid Enthalpy of combustion of solid at standard conditions ΔfH°solid Enthalpy of formation of solid at standard conditions ΔsubH° Enthalpy of sublimation at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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