Benzoic acid, 3,4-dihydroxy-
- Formula: C7H6O4
- Molecular weight: 154.1201
- IUPAC Standard InChI: InChI=1S/C7H6O4/c8-5-2-1-4(7(10)11)3-6(5)9/h1-3,8-9H,(H,10,11)
- IUPAC Standard InChIKey: YQUVCSBJEUQKSH-UHFFFAOYSA-N
- CAS Registry Number: 99-50-3
- Chemical structure:
This structure is also available as a 2d Mol file - Other names: Protocatechuic acid; 3,4-Dihydroxybenzoic acid; 4-Carboxy-1,2-dihydroxybenzene
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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: William E. Acree, Jr., James S. Chickos
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔsubH° | 135.1 ± 1.2 | kJ/mol | ME | Monte, Gonc«807»alves, et al., 2010 | Based on data from 387. to 403. K. |
Enthalpy of sublimation
| ΔsubH (kJ/mol) | Temperature (K) | Method | Reference | Comment |
|---|---|---|---|---|
| 132.3 ± 1.2 | 395. | ME | Monte, Gonc«807»alves, et al., 2010 | Based on data from 387. to 403. K. |
Enthalpy of fusion
| ΔfusH (kJ/mol) | Temperature (K) | Method | Reference |
|---|---|---|---|
| 31.2 | 472.3 | DSC | Queimada, Mota, et al., 2009 |
Gas Chromatography
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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
Normal alkane RI, non-polar column, isothermal
| Column type | Active phase | Temperature (C) | I | Reference | Comment |
|---|---|---|---|---|---|
| Packed | Apieson L | 140. | 1557. | Hedin, Minyard, et al., 1967 | Nitrogen, Chromosorb W HMDS (60-80 mesh); Column length: 1.8 m |
References
Go To: Top, Phase change data, Gas Chromatography, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Monte, Gonc«807»alves, et al., 2010
Monte, Manuel J.S.; Gonc«807»alves, Mariana V.; Ribeiro da Silva, Maria D.M.C.,
Vapor Pressures and Enthalpies of Combustion of the Dihydroxybenzoic Acid Isomers,
J. Chem. Eng. Data, 2010, 55, 6, 2246-2251, https://doi.org/10.1021/je900777q
. [all data]
Queimada, Mota, et al., 2009
Queimada, Antonio J.; Mota, Fatima L.; Pinho, Simao P.; Macedo, Eugenia A.,
Solubilities of Biologically Active Phenolic Compounds: Measurements and Modeling,
J. Phys. Chem. B, 2009, 113, 11, 3469-3476, https://doi.org/10.1021/jp808683y
. [all data]
Hedin, Minyard, et al., 1967
Hedin, P.A.; Minyard, J.P.; Thompson, A.C.,
Chromatographic and spectral analysis of phenolic acids and related compounds,
J. Chromatogr., 1967, 30, 43-53, https://doi.org/10.1016/S0021-9673(00)84111-4
. [all data]
Notes
Go To: Top, Phase change data, Gas Chromatography, References
- Symbols used in this document:
ΔfusH Enthalpy of fusion ΔsubH Enthalpy of sublimation ΔsubH° Enthalpy of sublimation at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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