Cyclopropane, 1,2-dimethyl-, cis-

Formula: C₅H₁₀
Molecular weight: 70.1329
IUPAC Standard InChI: InChI=1S/C5H10/c1-4-3-5(4)2/h4-5H,3H2,1-2H3/t4-,5+
IUPAC Standard InChIKey: VKJLDXGFBJBTRQ-SYDPRGILSA-N
CAS Registry Number: 930-18-7
Chemical structure:
This structure is also available as a 2d Mol file or as a computed 3d SD file
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Stereoisomers:
Other names: cis-1,2-Dimethylcyclopropane; 1,cis-2-Dimethylcyclopropane; c-1,2-Dimethylcyclopropane
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Gas phase thermochemistry data

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Data compiled by: Glushko Thermocenter, Russian Academy of Sciences, Moscow

Constant pressure heat capacity of gas

C_p,gas (cal/mol*K)	Temperature (K)	Reference	Comment
8.583	50.	Thermodynamics Research Center, 1997	p=1 bar.
11.81	100.
14.93	150.
17.92	200.
22.82	273.15
24.630	298.15
24.766	300.
32.079	400.
38.685	500.
44.302	600.
49.054	700.
53.114	800.
56.611	900.
59.632	1000.
62.249	1100.
64.520	1200.
66.487	1300.
68.198	1400.
69.687	1500.
72.63	1750.
74.78	2000.
76.39	2250.
77.58	2500.
78.49	2750.
79.21	3000.

Condensed phase thermochemistry data

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Data compiled by: Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein

Quantity	Value	Units	Method	Reference	Comment
Δ_fH°_liquid	-6.29 ± 0.16	kcal/mol	Ccb	Good, 1971
Quantity	Value	Units	Method	Reference	Comment
Δ_cH°_liquid	-805.55 ± 0.14	kcal/mol	Ccb	Good, 1971	Corresponding Δ_fHº_liquid = -6.28 kcal/mol (simple calculation by NIST; no Washburn corrections)

Gas phase ion energetics data

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Data compiled as indicated in comments:
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron

View reactions leading to C₅H₁₀⁺ (ion structure unspecified)

Ionization energy determinations

IE (eV)	Method	Reference	Comment
9.76 ± 0.02	EI	Natalis and Laune, 1964	RDSH

Appearance energy determinations

Ion	AE (eV)	Other Products	Method	Reference	Comment
C₃H₆⁺	11.26	C₂H₄	EI	Natalis and Laune, 1964	RDSH
C₄H₇⁺	11.32 ± 0.03	CH₃	EI	Natalis and Laune, 1964	RDSH

References

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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]

Good, 1971
Good, W.D., The enthalpies of combustion and formation of some alkyl cyclopropanes, J. Chem. Thermodyn., 1971, 3, 539-546. [all data]

Natalis and Laune, 1964
Natalis, P.; Laune, J., Etude du comportement d'isomeres geometriques sous l'impact electronique. IV. Cyclopropane, methylcyclopropane et dimethylcyclopropanes gem. cis et trans, Bull. Soc. Chim. Belges, 1964, 73, 944. [all data]

Notes

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Symbols used in this document:

AE	Appearance energy
C_p,gas	Constant pressure heat capacity of gas
Δ_cH°_liquid	Enthalpy of combustion of liquid at standard conditions
Δ_fH°_liquid	Enthalpy of formation of liquid at standard conditions

Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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