Cyclopentene, 1-methyl-

Formula: C₆H₁₀
Molecular weight: 82.1436
IUPAC Standard InChI: InChI=1S/C6H10/c1-6-4-2-3-5-6/h4H,2-3,5H2,1H3
IUPAC Standard InChIKey: ATQUFXWBVZUTKO-UHFFFAOYSA-N
CAS Registry Number: 693-89-0
Chemical structure:
This structure is also available as a 2d Mol file or as a computed 3d SD file
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Other names: 1-Methyl-1-cyclopentene; 1-Methylcyclopentene; 1-Methyl-1-cyclopentane; Cyc1opentene,l-methyl-; 1-Cyclopentene, 1-methyl; 1-Methylcyclopentene-1
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Condensed phase thermochemistry data

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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

Quantity	Value	Units	Method	Reference	Comment
Δ_fH°_liquid	-36.4 ± 0.63	kJ/mol	Ccb	Good and Smith, 1969	ALS
Δ_fH°_liquid	-37.9 ± 0.67	kJ/mol	Ccb	Labbauf and Rossini, 1961	ALS
Quantity	Value	Units	Method	Reference	Comment
Δ_cH°_liquid	-3753.8 ± 0.54	kJ/mol	Ccb	Good and Smith, 1969	Corresponding Δ_fHº_liquid = -36.4 kJ/mol (simple calculation by NIST; no Washburn corrections); ALS
Δ_cH°_liquid	-3752.4 ± 0.59	kJ/mol	Ccb	Labbauf and Rossini, 1961	Corresponding Δ_fHº_liquid = -37.8 kJ/mol (simple calculation by NIST; no Washburn corrections); ALS

Constant pressure heat capacity of liquid

C_p,liquid (J/mol*K)	Temperature (K)	Reference	Comment
153.1	298.15	Fuchs and Peacock, 1979	DH

Phase change data

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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.

Quantity	Value	Units	Method	Reference	Comment
T_boil	349. ± 1.	K	AVG	N/A	Average of 26 out of 28 values; Individual data points
Quantity	Value	Units	Method	Reference	Comment
T_fus	147. ± 2.	K	AVG	N/A	Average of 10 values; Individual data points
Quantity	Value	Units	Method	Reference	Comment
Δ_vapH°	32.6 ± 0.3	kJ/mol	C	Fuchs and Peacock, 1979	ALS
Δ_vapH°	32.6 ± 0.2	kJ/mol	GCC	Fuchs and Peacock, 1979	AC
Δ_vapH°	34. ± 2.	kJ/mol	V	Labbauf and Rossini, 1961	Heat of formation derived by Cox and Pilcher, 1970; ALS
Δ_vapH°	33.9	kJ/mol	N/A	Labbauf and Rossini, 1961	DRB

Reduced pressure boiling point

T_boil (K)	Pressure (bar)	Reference	Comment
345.2	1.01	Aldrich Chemical Company Inc., 1990	BS

Enthalpy of vaporization

Δ_vapH (kJ/mol)	Temperature (K)	Method	Reference	Comment
33.4	283.	A	Stephenson and Malanowski, 1987	Based on data from 268. to 403. K. See also Dykyj, 1972.; AC

In addition to the Thermodynamics Research Center (TRC) data available from this site, much more physical and chemical property data is available from the following TRC products:

References

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Good and Smith, 1969
Good, W.D.; Smith, N.K., Enthalpies of combustion of toluene, benzene, cyclohexane, cyclohexene, methylcyclopentane, 1-methylcyclopentene, and n-hexane, J. Chem. Eng. Data, 1969, 14, 102-106. [all data]

Labbauf and Rossini, 1961
Labbauf, A.; Rossini, F.D., Heats of combustion, formation, and hydrogenation of 14 selected cyclomonoolefin hydrocarbons, J. Phys. Chem., 1961, 65, 476-480. [all data]

Fuchs and Peacock, 1979
Fuchs, R.; Peacock, L.A., Heats of vaporization and gaseous heats of formation of some five- and six-membered ring alkenes, Can. J. Chem., 1979, 57, 2302-2304. [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]

Aldrich Chemical Company Inc., 1990
Aldrich Chemical Company Inc., Catalog Handbook of Fine Chemicals, Aldrich Chemical Company, Inc., Milwaukee WI, 1990, 1. [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]

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

Notes

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Symbols used in this document:

C_p,liquid	Constant pressure heat capacity of liquid
T_boil	Boiling point
T_fus	Fusion (melting) point
Δ_cH°_liquid	Enthalpy of combustion of liquid at standard conditions
Δ_fH°_liquid	Enthalpy of formation of liquid at standard conditions
Δ_vapH	Enthalpy of vaporization
Δ_vapH°	Enthalpy of vaporization at standard conditions

Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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