Cyclopropane, 1,1-dimethyl-
- Formula: C5H10
- Molecular weight: 70.1329
- IUPAC Standard InChI: InChI=1S/C5H10/c1-5(2)3-4-5/h3-4H2,1-2H3
- IUPAC Standard InChIKey: PBIJFSCPEFQXBB-UHFFFAOYSA-N
- CAS Registry Number: 1630-94-0
- 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: Gem-Dimethylcyclopropane; 1,1-Dimethylcyclopropane
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Gas phase thermochemistry data
Go To: Top, Condensed phase thermochemistry data, Phase change 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 as indicated in comments:
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
GT - Glushko Thermocenter, Russian Academy of Sciences, Moscow
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔfH°gas | -1.97 ± 0.28 | kcal/mol | Ccb | Good, Moore, et al., 1974 | ALS |
Constant pressure heat capacity of gas
| Cp,gas (cal/mol*K) | Temperature (K) | Reference | Comment |
|---|---|---|---|
| 8.253 | 50. | Thermodynamics Research Center, 1997 | p=1 bar. Selected values are lower than other statistically calculated values [ Kabo G.Y., 1973] up to 2.2 and 1.1 J/mol*K for S(T) and Cp(T), respectively.; GT |
| 11.02 | 100. | ||
| 14.45 | 150. | ||
| 17.88 | 200. | ||
| 23.43 | 273.15 | ||
| 25.423 | 298.15 | ||
| 25.571 | 300. | ||
| 33.289 | 400. | ||
| 39.955 | 500. | ||
| 45.483 | 600. | ||
| 50.105 | 700. | ||
| 54.037 | 800. | ||
| 57.416 | 900. | ||
| 60.337 | 1000. | ||
| 62.868 | 1100. | ||
| 65.065 | 1200. | ||
| 66.972 | 1300. | ||
| 68.628 | 1400. | ||
| 70.074 | 1500. | ||
| 72.94 | 1750. | ||
| 75.02 | 2000. | ||
| 76.58 | 2250. | ||
| 77.75 | 2500. | ||
| 78.63 | 2750. | ||
| 79.35 | 3000. |
Condensed phase thermochemistry data
Go To: Top, Gas phase thermochemistry data, Phase change 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
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔfH°liquid | -7.97 ± 0.19 | kcal/mol | Ccb | Good, Moore, et al., 1974 | |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔcH°liquid | -803.86 ± 0.17 | kcal/mol | Ccb | Good, Moore, et al., 1974 | Corresponding ΔfHºliquid = -7.97 kcal/mol (simple calculation by NIST; no Washburn corrections) |
Phase change data
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry 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 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
DRB - Donald R. Burgess, Jr.
AC - William E. Acree, Jr., James S. Chickos
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| Tboil | 295. ± 9. | K | AVG | N/A | Average of 10 values; Individual data points |
| Quantity | Value | Units | Method | Reference | Comment |
| Tfus | 164. ± 1. | K | AVG | N/A | Average of 9 values; Individual data points |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔvapH° | 6.0 ± 0.2 | kcal/mol | E | Good, Moore, et al., 1974 | ALS |
| ΔvapH° | 6.00 | kcal/mol | N/A | Good, Moore, et al., 1974 | DRB |
| ΔvapH° | 6.0 ± 0.2 | kcal/mol | EB | Good, Moore, et al., 1974 | AC |
References
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Good, Moore, et al., 1974
Good, W.D.; Moore, R.T.; Osborn, A.G.; Douslin, D.R.,
The enthalpies of formation of ethylcyclobutane, methylenecyclobutane, and 1,1-dimethylcyclopropane,
J. Chem. Thermodyn., 1974, 6, 303-310. [all data]
Thermodynamics Research Center, 1997
Thermodynamics Research Center,
Selected Values of Properties of Chemical Compounds., Thermodynamics Research Center, Texas A&M University, College Station, Texas, 1997. [all data]
Kabo G.Y., 1973
Kabo G.Y.,
Thermodynamic properties of some hydrocarbons containing three-membered rings,
Vestn. Beloruss. Univ., Ser. 2, 1973, 3-6. [all data]
Notes
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, References
- Symbols used in this document:
Cp,gas Constant pressure heat capacity of gas 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 ΔvapH° Enthalpy of vaporization at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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