Amylene hydrate
- Formula: C5H12O
- Molecular weight: 88.1482
- IUPAC Standard InChIKey: MSXVEPNJUHWQHW-UHFFFAOYSA-N
- CAS Registry Number: 75-85-4
- 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: 2-Butanol, 2-methyl-; tert-Pentyl alcohol; tert-Amyl alcohol; tert-Pentanol; Dimethyl ethyl carbinol; Ethyl dimethyl carbinol; 1,1-Dimethyl-1-propanol; 2-Methyl-2-butanol; C2H5C(CH3)2OH; 2-Methyl butanol-2; 3-Methylbutan-3-ol; t-Amyl alcohol; 2-Methylbutan-2-ol; tert-Isoamyl alcohol; 3-Methyl-butanol-(3); Methyl-2 butanol-2; Methyl-3 butanol-3; NSC 25498; 2-methyl-2-butanol (tert-amyl alcohol)
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Gas phase thermochemistry data
Go To: Top, Condensed phase thermochemistry 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 as indicated in comments:
DRB - Donald R. Burgess, Jr.
GT - Glushko Thermocenter, Russian Academy of Sciences, Moscow
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔfH°gas | -78.70 | kcal/mol | N/A | Chao and Rossini, 1965 | Value computed using ΔfHliquid° value of -379.5±0.54 kj/mol from Chao and Rossini, 1965 and ΔvapH° value of 50.17 kj/mol from missing citation.; DRB |
Quantity | Value | Units | Method | Reference | Comment |
S°gas | 86.7 ± 1.6 | cal/mol*K | N/A | Wilhoit R.C., 1973 | Other third-law value of entropy at 298.15 K is 366.85 J/mol*K [ Stull D.R., 1969].; GT |
Constant pressure heat capacity of gas
Cp,gas (cal/mol*K) | Temperature (K) | Reference | Comment |
---|---|---|---|
40.08 ± 0.99 | 381.35 | Stromsoe E., 1970 | Ideal gas heat capacities are given by [ Stromsoe E., 1970] as a linear function Cp=f1*(a+bT). This expression approximates the experimental values with the average deviation of 4.14 J/mol*K. The accuracy of the experimental heat capacities [ Stromsoe E., 1970] is estimated as less than 0.3%.; GT |
40.30 ± 0.99 | 384.65 | ||
40.49 ± 0.99 | 387.45 | ||
41.07 ± 0.99 | 396.05 | ||
41.21 ± 0.99 | 398.05 | ||
43.10 ± 0.99 | 425.95 | ||
46.43 ± 0.99 | 475.25 | ||
49.52 ± 0.99 | 520.85 | ||
53.25 ± 0.99 | 576.05 |
Condensed phase thermochemistry data
Go To: Top, Gas phase thermochemistry 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 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 |
---|---|---|---|---|---|
ΔfH°liquid | -90.71 ± 0.13 | kcal/mol | Ccb | Chao and Rossini, 1965 | ALS |
Quantity | Value | Units | Method | Reference | Comment |
ΔcH°liquid | -789.45 ± 0.11 | kcal/mol | Ccb | Chao and Rossini, 1965 | Corresponding ΔfHºliquid = -90.70 kcal/mol (simple calculation by NIST; no Washburn corrections); ALS |
Quantity | Value | Units | Method | Reference | Comment |
S°liquid | 54.80 | cal/mol*K | N/A | Parks, Huffman, et al., 1933 | Extrapolation below 90 K, 46.78 J/mol*K.; DH |
Constant pressure heat capacity of liquid
Cp,liquid (cal/mol*K) | Temperature (K) | Reference | Comment |
---|---|---|---|
59.070 | 298.15 | Piekarski and Somsen, 1988 | DH |
59.479 | 298.15 | Benson and D'Arcy, 1986 | DH |
59.479 | 298.15 | Benson and D'Arcy, 1986, 2 | DH |
59.11 | 298.15 | D'Aprano, DeLisi, et al., 1983 | Data given at 288 and 298 K.; DH |
58.351 | 294.4 | Parks, Huffman, et al., 1933 | T = 92 to 294 K. Value is unsmoothed experimental datum.; DH |
Gas phase ion energetics 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:
B - John E. Bartmess
LLK - Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi
LL - Sharon G. Lias and Joel F. Liebman
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron
View reactions leading to C5H12O+ (ion structure unspecified)
Ionization energy determinations
IE (eV) | Method | Reference | Comment |
---|---|---|---|
9.8 | PE | Peel and Willett, 1975 | LLK |
10.16 ± 0.03 | PE | Peel and Willett, 1975 | Vertical value; LLK |
Appearance energy determinations
Ion | AE (eV) | Other Products | Method | Reference | Comment |
---|---|---|---|---|---|
C3H7O+ | 9.83 | C2H5 | EI | Holmes, Lossing, et al., 1988 | LL |
C3H7O+ | 9.80 | C2H5 | EI | Lossing, 1977 | LLK |
C3H7O+ | 10.0 | C2H5 | EI | Harrison, Ivko, et al., 1966 | RDSH |
C4H9O+ | 9.89 | CH3 | EI | Lossing, 1977 | LLK |
De-protonation reactions
C5H11O- + =
By formula: C5H11O- + H+ = C5H12O
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 373.1 ± 2.0 | kcal/mol | CIDC | Haas and Harrison, 1993 | gas phase; Both metastable and 50 eV collision energy.; B |
ΔrH° | 373.0 ± 2.8 | kcal/mol | G+TS | Boand, Houriet, et al., 1983 | gas phase; value altered from reference due to change in acidity scale; B |
Quantity | Value | Units | Method | Reference | Comment |
ΔrG° | 366.5 ± 2.1 | kcal/mol | H-TS | Haas and Harrison, 1993 | gas phase; Both metastable and 50 eV collision energy.; B |
ΔrG° | 366.4 ± 2.7 | kcal/mol | CIDC | Boand, Houriet, et al., 1983 | gas phase; value altered from reference due to change in acidity scale; B |
References
Go To: Top, Gas phase thermochemistry data, Condensed phase 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.
Chao and Rossini, 1965
Chao, J.; Rossini, F.D.,
Heats of combustion, formation, and isomerization of nineteen alkanols,
J. Chem. Eng. Data, 1965, 10, 374-379. [all data]
Wilhoit R.C., 1973
Wilhoit R.C.,
Physical and thermodynamic properties of aliphatic alcohols,
J. Phys. Chem. Ref. Data, 1973, 2, Suppl. 1, 1-420. [all data]
Stull D.R., 1969
Stull D.R., Jr.,
The Chemical Thermodynamics of Organic Compounds. Wiley, New York, 1969. [all data]
Stromsoe E., 1970
Stromsoe E.,
Heat capacity of alcohol vapors at atmospheric pressure,
J. Chem. Eng. Data, 1970, 15, 286-290. [all data]
Parks, Huffman, et al., 1933
Parks, G.S.; Huffman, H.M.; Barmore, M.,
Thermal data on organic compounds. XI. The heat capacities,
entropies and free energies of ten compounds containing oxygen or nitrogen. J. Am. Chem. Soc., 1933, 55, 2733-2740. [all data]
Piekarski and Somsen, 1988
Piekarski, H.; Somsen, G.,
Heat capacities and volumes of mixtures of N,N-dimethylformamide with isobutanol, sec-butanol and t-pentanol, J. Chem. Soc.,
Faraday Trans. 1, 1988, 84(2), 529-537. [all data]
Benson and D'Arcy, 1986
Benson, G.C.; D'Arcy, P.J.,
Excess isobaric heat capacities of some binary mixtures: (a C5-alkanol + n-heptane) at 298.15 K,
J. Chem. Thermodynam., 1986, 18, 493-498. [all data]
Benson and D'Arcy, 1986, 2
Benson, G.C.; D'Arcy, P.J.,
Heat capacities of binary mixtures of n-dodecane with hexane isomers,
Thermochim. Acta, 1986, 102, 75-81. [all data]
D'Aprano, DeLisi, et al., 1983
D'Aprano, A.; DeLisi, R.; Donato, D.I.,
Thermodynamics of binary mixtures: volumes, heat capacities, and dilution enthalpies for the n-pentanol + 2-methyl-2-butanol system,
J. Solution Chem., 1983, 12, 383-400. [all data]
Peel and Willett, 1975
Peel, J.B.; Willett, G.D.,
Photoelectron spectroscopic studies of the higher alcohols,
Aust. J. Chem., 1975, 28, 2357. [all data]
Holmes, Lossing, et al., 1988
Holmes, J.L.; Lossing, F.P.; Maccoll, A.,
Heats of formation of alkyl radicals from appearance energies,
J. Am. Chem. Soc., 1988, 110, 7339. [all data]
Lossing, 1977
Lossing, F.P.,
Heats of formation of some isomeric [CnH2n+1]+ ions. Substitutional effects on ion stability,
J. Am. Chem. Soc., 1977, 99, 7526. [all data]
Harrison, Ivko, et al., 1966
Harrison, A.G.; Ivko, A.; Van Raalte, D.,
Energetics of formation of some oxygenated ions and the proton affinities of carbonyl compounds,
Can. J. Chem., 1966, 44, 1625. [all data]
Haas and Harrison, 1993
Haas, M.J.; Harrison, A.G.,
The Fragmentation of Proton-Bound Cluster Ions and the Gas-Phase Acidities of Alcohols,
Int. J. Mass Spectrom. Ion Proc., 1993, 124, 2, 115, https://doi.org/10.1016/0168-1176(93)80003-W
. [all data]
Boand, Houriet, et al., 1983
Boand, G.; Houriet, R.; Baumann, T.,
The gas phase acidity of aliphatic alcohols,
J. Am. Chem. Soc., 1983, 105, 2203. [all data]
Notes
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Gas phase ion energetics data, References
- Symbols used in this document:
AE Appearance energy Cp,gas Constant pressure heat capacity of gas Cp,liquid Constant pressure heat capacity of liquid S°gas Entropy of gas at standard conditions S°liquid Entropy of liquid at standard conditions 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 ΔrG° Free energy of reaction at standard conditions ΔrH° Enthalpy of reaction at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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