Dewar benzene, hexamethyl-
- Formula: C12H18
- Molecular weight: 162.2713
- IUPAC Standard InChIKey: RVNQQZMIWZPGNA-UHFFFAOYSA-N
- CAS Registry Number: 7641-77-2
- 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: Bicyclo[2.2.0]hexa-2,5-diene, 1,2,3,4,5,6-hexamethyl-; Hexamethyl Dewar benzene; Hexamethylbicyclo[2.2.0]hexa-2,5-diene; 1,2,3,4,5,6-Hexamethylbicyclo[2.2.0]hexa-2,5-diene; Bicyclo(2.2.0)hexa-2,5-diene, hexamethyl-; 2-Butin hexamethyl-dewar-benzol; Hexamethyl-bicyclo(2.2.0)hexa-2,5-dien; 1,2,3,4,5,6-hexamethylbicyclo(2,2,0)hexa-2,5-diene
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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 | -21.6 | kcal/mol | Ccb | Schafer and Hellmann, 1967 | |
Quantity | Value | Units | Method | Reference | Comment |
ΔcH°liquid | -1765. ± 1.1 | kcal/mol | Ccb | Schafer and Hellmann, 1967 | Corresponding ΔfHºliquid = 22. kcal/mol (simple calculation by NIST; no Washburn corrections) |
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 by: Robert L. Brown and Stephen E. Stein
Reduced pressure boiling point
Tboil (K) | Pressure (atm) | Reference |
---|---|---|
333.2 | 0.026 | Aldrich Chemical Company Inc., 1990 |
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
By formula: C12H18 = C12H18
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | -56.2 ± 0.6 | kcal/mol | Cm | Adam and Chang, 1969 | liquid phase; solvent: Pure phase |
ΔrH° | -59.5 | kcal/mol | Eqk | Oth, 1968 | liquid phase; Heat of isomerization, see Oth, 1969 |
By formula: C12H18 = C12H18
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | -55.7 ± 0.6 | kcal/mol | Cm | Adam and Chang, 1969 | liquid phase; solvent: Pure phase; Heat of isomerization |
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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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 | D.HENNEBERG, MAX-PLANCK INSTITUTE, MULHEIM, WEST GERMANY |
NIST MS number | 61751 |
UV/Visible spectrum
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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Spectrum
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Additional Data
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Source | (editor), 1973 |
---|---|
Owner | INEP CP RAS, NIST OSRD Collection (C) 2007 copyright by the U.S. Secretary of Commerce on behalf of the United States of America. All rights reserved. |
Origin | INSTITUTE OF ENERGY PROBLEMS OF CHEMICAL PHYSICS, RAS |
Source reference | RAS UV No. 18974 |
Instrument | SF-16 |
Boiling point | 43.0-45.0/ 15 mm |
References
Go To: Top, Condensed phase thermochemistry data, Phase change data, Reaction thermochemistry data, Mass spectrum (electron ionization), UV/Visible spectrum, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Schafer and Hellmann, 1967
Schafer, W.; Hellmann, H.,
Hexamethyl-Dewar-Benzol (Hexamethyl-bicyclo[2.2.0]hexa-2,5-dien),
Angew. Chem., 1967, 79, 566-573. [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]
Adam and Chang, 1969
Adam, W.; Chang, J.C.,
Kinetics and thermochemistry of valence isomerization by differential scanning calorimetry: the case of hexamethylprismane and hexamethyldewarbenzene,
Int. J. Chem. Kinet., 1969, 1, 487-492. [all data]
Oth, 1968
Oth, J.F.M.,
The kinetics and thermochemistry of the thermal rearrangement of hexamethylbicyclo[2.2.0]hexa-2,5-diene (hexamethyldewarbenzene) and of hexamethyltetracyclo[2.2.0,0(2,6).0(3,5)]hexane (hexamethylprismane),
Chem. Ber., 1968, 47, 1185-1195. [all data]
Oth, 1969
Oth, J.F.M.,
The kinetics and thermochemistry of the thermal rearrangement of hexamethyl(Dewar benzene) and of hexamethylprismane,
Angew. Chem. Int. Ed. Engl., 1969, 7, 646. [all data]
(editor), 1973
(editor), Koptyug V.A.,
Atlas of Spectra of Aromatic and Heterocyclic Compounds, 1973, 3, 75. [all data]
Notes
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- Symbols used in this document:
Tboil Boiling point ΔcH°liquid Enthalpy of combustion of liquid at standard conditions ΔfH°liquid Enthalpy of formation of liquid at standard conditions ΔrH° Enthalpy of reaction at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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