Ethane, 1,1,1-trimethoxy-
- Formula: C5H12O3
- Molecular weight: 120.1470
- IUPAC Standard InChI: InChI=1S/C5H12O3/c1-5(6-2,7-3)8-4/h1-4H3
- IUPAC Standard InChIKey: HDPNBNXLBDFELL-UHFFFAOYSA-N
- CAS Registry Number: 1445-45-0
- 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: Orthoacetic acid, trimethyl ester; Methyl orthoacetate; Trimethyl orthoacetate; 1,1,1-Trimethoxyethane; CH3C(OCH3)3
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Gas 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°gas | -136.44 ± 0.21 | kcal/mol | Cm | Wiberg and Squires, 1979 | Hydrolysis |
| ΔfH°gas | -136.89 ± 0.56 | kcal/mol | Cm | Hine and Klueppet, 1974 | Reanalyzed by Pedley, Naylor, et al., 1986, Original value = -136.6 kcal/mol |
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°liquid | -145.79 ± 0.11 | kcal/mol | Cm | Wiberg and Squires, 1979 | Hydrolysis |
| ΔfH°liquid | -146.26 ± 0.26 | kcal/mol | Cm | Hine and Klueppet, 1974 | Reanalyzed by Pedley, Naylor, et al., 1986, Original value = -146.0 kcal/mol |
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:
BS - Robert L. Brown and Stephen E. Stein
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
DRB - Donald R. Burgess, Jr.
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| Tboil | 381.2 | K | N/A | Weast and Grasselli, 1989 | BS |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔvapH° | 9.37 ± 0.18 | kcal/mol | E | Wiberg and Squires, 1979 | Hydrolysis; ALS |
| ΔvapH° | 9.35 | kcal/mol | N/A | Wiberg and Squires, 1979 | DRB |
| ΔvapH° | 9.37 | kcal/mol | V | Hine and Klueppet, 1974 | ALS |
| ΔvapH° | 9.39 | kcal/mol | N/A | Hine and Klueppet, 1974 | DRB |
Reaction 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
Note: Please consider using the reaction search for this species. This page allows searching of all reactions involving this species. A general reaction search form is also available. Future versions of this site may rely on reaction search pages in place of the enumerated reaction displays seen below.
Individual Reactions
+
= 2
+
By formula: C5H12O3 + H2O = 2CH4O + C3H6O2
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | -6.426 ± 0.007 | kcal/mol | Cm | Wiberg, Martin, et al., 1985 | liquid phase; solvent: Aqueous dioxane |
| ΔrH° | -6.4641 ± 0.0072 | kcal/mol | Cm | Wiberg and Squires, 1979 | liquid phase; solvent: Water; Hydrolysis |
+
=
+ 2
By formula: C5H12O3 + H2O = C3H6O2 + 2CH4O
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | -6.29 ± 0.65 | kcal/mol | Cm | Hine and Klueppet, 1974 | liquid phase |
Gas phase ion energetics 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:
LBLHLM - Sharon G. Lias, John E. Bartmess, Joel F. Liebman, John L. Holmes, Rhoda D. Levin, and W. Gary Mallard
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron
Ionization energy determinations
| IE (eV) | Method | Reference | Comment |
|---|---|---|---|
| 9.65 | EI | Holmes and Lossing, 1982 | LBLHLM |
Appearance energy determinations
| Ion | AE (eV) | Other Products | Method | Reference | Comment |
|---|---|---|---|---|---|
| C4H9O2+ | 10.37 ± 0.02 | CH3O | EI | Martin, Lampe, et al., 1966 | RDSH |
| C4H9O3+ | 9.86 | CH3 | EI | Holmes and Lossing, 1982 | LBLHLM |
| C4H9O3+ | 10.39 ± 0.10 | CH3 | EI | Martin, Lampe, et al., 1966 | RDSH |
IR Spectrum
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Data compiled by: Coblentz Society, Inc.
Data compiled by: NIST Mass Spectrometry Data Center, William E. Wallace, director
Mass spectrum (electron ionization)
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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: NIST Mass Spectrometry Data Center, William E. Wallace, director
Spectrum
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Additional Data
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Due to licensing restrictions, this spectrum cannot be downloaded.
| Owner | NIST Mass Spectrometry Data Center Collection (C) 2014 copyright by the U.S. Secretary of Commerce on behalf of the United States of America. All rights reserved. |
|---|---|
| Origin | Chemical Concepts |
| NIST MS number | 151593 |
References
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Reaction thermochemistry data, Gas phase ion energetics data, IR Spectrum, Mass spectrum (electron ionization), Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Wiberg and Squires, 1979
Wiberg, K.B.; Squires, R.R.,
A microprocessor-controlled system for precise measurement of temperature changes. Determination of the enthalpies of hydrolysis of some polyoxygenated hydrocarbons,
J. Chem. Thermodyn., 1979, 11, 773-786. [all data]
Hine and Klueppet, 1974
Hine, J.; Klueppet, A.W.,
Structural effects on rates and equilibria. XVIII. Thermodynamic stability of ortho esters,
J. Am. Chem. Soc., 1974, 96, 2924-2929. [all data]
Pedley, Naylor, et al., 1986
Pedley, J.B.; Naylor, R.D.; Kirby, S.P.,
Thermochemical Data of Organic Compounds, Chapman and Hall, New York, 1986, 1-792. [all data]
Weast and Grasselli, 1989
CRC Handbook of Data on Organic Compounds, 2nd Editon, Weast,R.C and Grasselli, J.G., ed(s)., CRC Press, Inc., Boca Raton, FL, 1989, 1. [all data]
Wiberg, Martin, et al., 1985
Wiberg, K.B.; Martin, E.J.; Squires, R.R.,
Thermochemical studies of carbonyl compounds. 3. Enthalpies of hydrolysis of ortho esters,
J. Org. Chem., 1985, 50, 4717-4720. [all data]
Holmes and Lossing, 1982
Holmes, J.L.; Lossing, F.P.,
Towards a general scheme for estimating the heats of formation of organic ions in the gas phase. Part II. The effect of substitution at charge-bearing sites,
Can. J. Chem., 1982, 60, 2365. [all data]
Martin, Lampe, et al., 1966
Martin, R.H.; Lampe, F.W.; Taft, R.W.,
An electron-impact study of ionization and dissociation in methoxy- and halogen- substituted methanes,
J. Am. Chem. Soc., 1966, 88, 1353. [all data]
Notes
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Reaction thermochemistry data, Gas phase ion energetics data, IR Spectrum, Mass spectrum (electron ionization), References
- Symbols used in this document:
AE Appearance energy Tboil Boiling point ΔfH°gas Enthalpy of formation of gas at standard conditions ΔfH°liquid Enthalpy of formation of liquid at standard conditions ΔrH° Enthalpy of reaction at standard conditions ΔvapH° Enthalpy of vaporization at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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