Mequinol
- Formula: C7H8O2
- Molecular weight: 124.1372
- IUPAC Standard InChIKey: NWVVVBRKAWDGAB-UHFFFAOYSA-N
- CAS Registry Number: 150-76-5
- 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: Phenol, 4-methoxy-; Phenol, p-methoxy-; p-Guaiacol; p-Hydroxyanisole; p-Methoxyphenol; Hydroquinone methyl ether; Hydroquinone monomethyl ether; HQMME; Leucobasal; Leucodine B; Mechinolum; Novo-dermoquinona; 1-Hydroxy-4-methoxybenzene; 4-Hydroxyanisole; 4-Methoxyphenol; Monomethyl ether hydroquinone; MME; USAF AN-7; Eastman HQMME; MEHQ; Mequinol (INN); BMS 181158; NSC 4960; p-Hydroxymethoxybenzene; PMF (antioxidant); Hydroxyanisole; Po-hydroxyanisole; Methoxyphenol
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Gas phase ion energetics data
Go To: Top, Mass spectrum (electron ionization), Gas Chromatography, 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
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron
View reactions leading to C7H8O2+ (ion structure unspecified)
Ionization energy determinations
IE (eV) | Method | Reference | Comment |
---|---|---|---|
7.50 | EI | Cooks, Bertrand, et al., 1973 | LLK |
8.0 ± 0.1 | EI | Brown, 1970 | RDSH |
Appearance energy determinations
Ion | AE (eV) | Other Products | Method | Reference | Comment |
---|---|---|---|---|---|
C6H5O2+ | 11.1 ± 0.1 | CH3 | EI | Brown, 1970 | RDSH |
C6H5O2+ | 11.0 ± 0.1 | CH3 | EI | Tait, Shannon, et al., 1962 | RDSH |
C6H6O+ | 10.30 | HCHO | EI | Cooks, Bertrand, et al., 1973 | LLK |
De-protonation reactions
C7H7O2- + =
By formula: C7H7O2- + H+ = C7H8O2
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 350.3 ± 2.1 | kcal/mol | G+TS | Fujio, McIver, et al., 1981 | gas phase; value altered from reference due to change in acidity scale; B |
ΔrH° | 351.1 ± 2.3 | kcal/mol | G+TS | Kebarle and McMahon, 1977 | gas phase; B |
Quantity | Value | Units | Method | Reference | Comment |
ΔrG° | 343.5 ± 2.0 | kcal/mol | IMRE | Fujio, McIver, et al., 1981 | gas phase; value altered from reference due to change in acidity scale; B |
ΔrG° | 344.2 ± 2.0 | kcal/mol | IMRE | Kebarle and McMahon, 1977 | gas phase; B |
Mass spectrum (electron ionization)
Go To: Top, Gas phase ion energetics data, Gas Chromatography, References, Notes
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 | NIST Mass Spectrometry Data Center, 1998. |
NIST MS number | 290707 |
Gas Chromatography
Go To: Top, Gas phase ion energetics data, Mass spectrum (electron ionization), References, Notes
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
Kovats' RI, non-polar column, custom temperature program
Column type | Active phase | I | Reference | Comment |
---|---|---|---|---|
Packed | SE-30 | 1210. | Grzybowski, Lamparczyk, et al., 1980 | Chromosorb W HMDS (80-100 mesh); Column length: 2.9 m; Program: not specified |
Van Den Dool and Kratz RI, non-polar column, temperature ramp
Column type | Active phase | I | Reference | Comment |
---|---|---|---|---|
Capillary | OV-1 | 1183. | Gautzsch and Zinn, 1996 | 8. K/min; Tstart: 35. C; Tend: 300. C |
Van Den Dool and Kratz RI, non-polar column, custom temperature program
Column type | Active phase | I | Reference | Comment |
---|---|---|---|---|
Capillary | VF-5MS | 1234.7 | Tret'yakov, 2008 | 30. m/0.25 mm/0.25 μm, He; Program: Multi-step temperature program; T(initial)=60C; T(final)=270C |
Normal alkane RI, non-polar column, temperature ramp
Column type | Active phase | I | Reference | Comment |
---|---|---|---|---|
Capillary | HP-1 | 1197. | Wetwiayaklung, Thavanapong, et al., 2009 | 25. m/0.32 mm/0.17 μm, 50. C @ 5. min, 1. K/min, 260. C @ 5. min |
Capillary | DB-1 | 1185. | Park, Lee, et al., 2004 | 60. m/0.32 mm/0.25 μm, He, 35. C @ 4. min, 2. K/min, 230. C @ 25. min |
Capillary | DB-1 | 1186. | Park, Lee, et al., 2004 | 60. m/0.32 mm/0.25 μm, He, 35. C @ 4. min, 2. K/min, 230. C @ 25. min |
Capillary | DB-1 | 1186. | Park, Lee, et al., 2004 | 60. m/0.32 mm/0.25 μm, He, 35. C @ 4. min, 2. K/min, 230. C @ 25. min |
Capillary | DB-1 | 1187. | Park, Lee, et al., 2004 | 60. m/0.32 mm/0.25 μm, He, 35. C @ 4. min, 2. K/min, 230. C @ 25. min |
Normal alkane RI, non-polar column, custom temperature program
Column type | Active phase | I | Reference | Comment |
---|---|---|---|---|
Capillary | HP-1 | 1198. | Wetwiayaklung, Thavanapong, et al., 2009 | 25. m/0.32 mm/0.17 μm; Program: not specified |
Capillary | DB-1 | 1180. | Sung, Stone, et al., 2007 | Helium; Column length: 30. m; Column diameter: 0.25 mm; Program: 120 0C (2 min( 5 0C/min -> 200 0C 10 0C/min -> 290 0C (5 min) |
Capillary | SE-30 | 1210. | Peterson, 1992 | Program: not specified |
Capillary | OV-1, SE-30, Methyl silicone, SP-2100, OV-101, DB-1, etc. | 1210. | Waggott and Davies, 1984 | Hydrogen; Column length: 50. m; Column diameter: 0.32 mm; Program: not specified |
References
Go To: Top, Gas phase ion energetics data, Mass spectrum (electron ionization), Gas Chromatography, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Cooks, Bertrand, et al., 1973
Cooks, R.G.; Bertrand, M.; Beynon, J.H.; Rennekamp, M.E.; Setser, D.W.,
Energy partitioning data as an ion structure probe. Substituted anisoles,
J. Am. Chem. Soc., 1973, 95, 1732. [all data]
Brown, 1970
Brown, P.,
Kinetic studies in mass spectrometry. VIII. Competing [M-CH3] and [M-CH2O] reactions in substituted anisoles. Approximate activation energies from ionization appearance potentials,
Org. Mass Spectrom., 1970, 4, 519. [all data]
Tait, Shannon, et al., 1962
Tait, J.M.S.; Shannon, T.W.; Harrison, A.G.,
The structure of substituted C7 ions from benzyl derivatives at the appearance potential threshold,
J. Am. Chem. Soc., 1962, 84, 4. [all data]
Fujio, McIver, et al., 1981
Fujio, M.; McIver, R.T., Jr.; Taft, R.W.,
Effects on the acidities of phenols from specific substituent-solvent interactions. Inherent substituent parameters from gas phase acidities,
J. Am. Chem. Soc., 1981, 103, 4017. [all data]
Kebarle and McMahon, 1977
Kebarle, P.; McMahon, T.B.,
Intrinsic Acidities of Substituted Phenols and Benzoic Acids Determined by Gas Phase Proton Transfer Equilibria,
J. Am. Chem. Soc., 1977, 99, 7, 2222, https://doi.org/10.1021/ja00449a032
. [all data]
Grzybowski, Lamparczyk, et al., 1980
Grzybowski, J.; Lamparczyk, H.; Nasal, A.; Radecki, A.,
Relationship between the retention indices of phenols on polar and non-polar stationary phases,
J. Chromatogr., 1980, 196, 2, 217-223, https://doi.org/10.1016/S0021-9673(00)80441-0
. [all data]
Gautzsch and Zinn, 1996
Gautzsch, R.; Zinn, P.,
Use of incremental models to estimate the retention indexes of aromatic compounds,
Chromatographia, 1996, 43, 3/4, 163-176, https://doi.org/10.1007/BF02292946
. [all data]
Tret'yakov, 2008
Tret'yakov, K.V.,
Retention Data. NIST Mass Spectrometry Data Center., NIST Mass Spectrometry Data Center, 2008. [all data]
Wetwiayaklung, Thavanapong, et al., 2009
Wetwiayaklung, P.; Thavanapong, N.; Charoenteeraboon, J.,
Chemical constituents and antimicrobial activity os essential oil and extracts of heartwood of Aquilaria crassna obtained from water distillation and supercritical fluid carbon dioxide extraction,
Silpakorn U Sci. J., 2009, 3, 1, 25-33. [all data]
Park, Lee, et al., 2004
Park, B.-S.; Lee, K.-G.; Takeoka, G.R.,
Comparison of three sample preparation methods on the recovery of volatiles from taheebo (Tabebuia impetiginosa Martius ex DC),
Flavour Fragr. J., 2004, 19, 4, 287-292, https://doi.org/10.1002/ffj.1345
. [all data]
Sung, Stone, et al., 2007
Sung, W.-C.; Stone, M.; Sun, F.-M.,
Analysis of volatile constituents of different temperature rice hulls liquid smoke,
Chi-Nan Annual Bull., 2007, 33, 1-12. [all data]
Peterson, 1992
Peterson, K.L.,
Counter-Propagation Neural Networks in the Modeling and Prediction of Kovats Indices for Substituted Phenols,
Anal. Chem., 1992, 64, 4, 379-386, https://doi.org/10.1021/ac00028a011
. [all data]
Waggott and Davies, 1984
Waggott, A.; Davies, I.W.,
Identification of organic pollutants using linear temperature programmed retention indices (LTPRIs) - Part II, 1984, retrieved from http://dwi.defra.gov.uk/research/completed-research/reports/dwi0383.pdf. [all data]
Notes
Go To: Top, Gas phase ion energetics data, Mass spectrum (electron ionization), Gas Chromatography, References
- Symbols used in this document:
AE Appearance energy 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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