Methylhydroquinone

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  • Identifiers

    CAS number
    95-71-6

    Molecular formula
    C7H8O2

    SMILES
    CC1=C(C=CC(=C1)O)O

    Safety labels

    Corrosive
    Corrosive

    Irritant
    Irritant

    Health Hazard
    Health

    Environmental Hazard
    Environmental

  • Odor profile

    Fragrance
    Phenolic 89.36%
    Medicinal 64.06%
    Smoky 60.67%
    Burnt 48.99%
    Spicy 47.7%
    Sweet 46.02%
    Woody 44.71%
    Vanilla 38.41%
    Leathery 35.94%
    Musty 30.65%

     

    Flavor
    Phenolic 71.54%
    Bitter 52.04%
    Medicinal 45.55%
    Smoke 39.6%
    Medical 38.15%
    Phenol 36.3%
    Smoky 34.31%
    Mild 33.18%
    Sweet 32.2%
    Bacon 31.5%

     

    Odor impact est.
    Medium

  • Properties

    XLogP3-AA
    1.0

    pKa est.
    10.79 (weak base)

    Molecular weight
    124.14 g/mol

    Vapor pressure est.

    • hPa @ 20°C
    • hPa @ 25°C

    Evaporation rate
    Ultra slow

    Boiling point est.
    274°C

    Flash point

    • 132.61 ˚C est.

  • Synonyms

    • Methylhydroquinone
    • 2-Methylhydroquinone
    • 95-71-6
    • 2-methylbenzene-1,4-diol
    • 2,5-Dihydroxytoluene
    • Toluhydroquinone
    • p-Toluhydroquinone
    • Toluquinol
    • p-Toluquinol
    • p-Toluhydroquinol
    • Tolylhydroquinone
    • 2,5-Toluenediol
    • 2-Methyl-1,4-benzenediol
    • 1,4-Benzenediol, 2-methyl-
    • 1,4-Dihydroxy-2-methylbenzene
    • 2-Methyl-1,4-hydroquinone
    • DTXSID4020876
    • 332W51E0OC
    • NSC-4962
    • DTXCID00876
    • CHEBI:133842
    • RefChem:474802
    • 202-443-7
    • Methyl-p-hydroquinone
    • Hydroquinone, methyl-
    • METHYL HYDROQUINONE
    • Hydroquinone, tolyl-
    • Pyrolin
    • NSC 4962
    • MFCD00002345
    • 3-methyl-1,4-dihydroxybenzene
    • NSC4962
    • EINECS 202-443-7
    • BRN 2041489
    • 2-Methyl-benzene-1,4-diol
    • UNII-332W51E0OC
    • methylhydroquinon
    • 2-methyl-1,4-dihydroxybenzene
    • AI3-14932
    • 2-methylhydroquinol
    • 7DV
    • methyl-p-hydroquinol
    • monomethylhydroquinone
    • 2-methyl hydroquinone
    • 2-Methyl-hydroquinone
    • monomethyl hydroquinone
    • 2-Methyl-p-hydroquinone
    • Methylhydroquinone, 99%
    • 3-methyl-4-hydroxyphenol
    • 4-hydroxy-2-methylphenol
    • EC 202-443-7
    • 2-Methylbenzene-1,4-diole
    • Methylhydroquinone, >=99%
    • WLN: L6V DVJ X1
    • SCHEMBL36349
    • 2,5-DHTOP
    • 4-06-00-05866 (Beilstein Handbook Reference)
    • CHEMBL450917
    • orb1297075
    • SCHEMBL3129209
    • SCHEMBL3131704
    • SCHEMBL3293398
    • SCHEMBL8189144
    • SCHEMBL9164140
    • WLN: L6V DVJ XR X1
    • 3-metyl-1,4-dihydroxy benzene
    • SCHEMBL11047904
    • SCHEMBL11377075
    • SCHEMBL28134404
    • SCHEMBL29364957
    • 2-methyl-1,4-dihydroxy benzene
    • BDBM176768
    • Tox21_200506
    • SBB058737
    • AKOS015856210
    • AC-4660
    • CS-W013533
    • EBC-457106
    • FM15173
    • HY-W012817
    • CAS-95-71-6
    • NCGC00248664-01
    • NCGC00258060-01
    • AS-15442
    • CAS# 95-71-6
    • DA-77257
    • M0342
    • NS00006438
    • ST51037682
    • Methylhydroquinone, purum, >=98.0% (HPLC)
    • E83005
    • EN300-124928
    • US9688816, 8
    • F223171
    • Q1925586
    • F0001-2277
    • InChI=1/C7H8O2/c1-5-4-6(8)2-3-7(5)9/h2-4,8-9H,1H
    • 95-71-6

  • Applications

    Methylhydroquinone (CAS 95-71-6) finds use as an intermediate in the synthesis of hydroquinone derivatives and related specialty chemicals; as an antioxidant and processing stabilizer in polymers, coatings, and adhesives to limit oxidative degradation; as a polymerization inhibitor in certain monomer systems (e.g., acrylics and methacrylates) to control cure and shelf life; as a building block for dye- and fragrance-related intermediates in specialty chemicals; and as a potential precursor for other organic syntheses, including pharmaceutical or agrochemical intermediates under appropriate regulatory controls.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 370.0
    methanol 464.44
    isopropanol 269.45
    water 18.86
    ethyl acetate 136.53
    n-propanol 250.74
    acetone 170.55
    n-butanol 202.83
    acetonitrile 117.07
    DMF 331.48
    toluene 13.26
    isobutanol 148.96
    1,4-dioxane 441.68
    methyl acetate 146.85
    THF 716.39
    2-butanone 149.02
    n-pentanol 155.22
    sec-butanol 187.63
    n-hexane 8.3
    ethylene glycol 126.1
    NMP 107.43
    cyclohexane 2.56
    DMSO 348.27
    n-butyl acetate 88.4
    n-octanol 92.62
    chloroform 72.99
    n-propyl acetate 85.46
    acetic acid 145.76
    dichloromethane 58.67
    cyclohexanone 99.28
    propylene glycol 93.59
    isopropyl acetate 92.34
    DMAc 212.28
    2-ethoxyethanol 333.0
    isopentanol 155.07
    n-heptane 11.7
    ethyl formate 106.58
    1,2-dichloroethane 52.89
    n-hexanol 187.17
    2-methoxyethanol 423.47
    isobutyl acetate 55.1
    tetrachloromethane 31.96
    n-pentyl acetate 63.64
    transcutol 276.09
    n-heptanol 108.52
    ethylbenzene 17.3
    MIBK 110.31
    2-propoxyethanol 342.9
    tert-butanol 366.8
    MTBE 197.77
    2-butoxyethanol 188.51
    propionic acid 132.86
    o-xylene 19.02
    formic acid 169.14
    diethyl ether 144.19
    m-xylene 23.99
    p-xylene 20.78
    chlorobenzene 20.48
    dimethyl carbonate 68.67
    n-octane 6.87
    formamide 265.34
    cyclopentanone 195.29
    2-pentanone 137.97
    anisole 88.01
    cyclopentyl methyl ether 154.46
    gamma-butyrolactone 237.28
    1-methoxy-2-propanol 298.48
    pyridine 60.44
    3-pentanone 71.72
    furfural 146.4
    n-dodecane 6.12
    diethylene glycol 286.95
    diisopropyl ether 49.38
    tert-amyl alcohol 255.0
    acetylacetone 144.81
    n-hexadecane 6.44
    acetophenone 58.96
    methyl propionate 107.99
    isopentyl acetate 72.86
    trichloroethylene 86.33
    n-nonanol 81.35
    cyclohexanol 76.36
    benzyl alcohol 62.63
    2-ethylhexanol 88.16
    isooctanol 85.25
    dipropyl ether 81.32
    1,2-dichlorobenzene 26.27
    ethyl lactate 57.76
    propylene carbonate 97.41
    n-methylformamide 233.52
    2-pentanol 136.27
    n-pentane 6.26
    1-propoxy-2-propanol 185.15
    1-methoxy-2-propyl acetate 106.98
    2-(2-methoxypropoxy) propanol 110.6
    mesitylene 19.0
    ε-caprolactone 99.68
    p-cymene 21.15
    epichlorohydrin 280.28
    1,1,1-trichloroethane 64.29
    2-aminoethanol 219.49
    morpholine-4-carbaldehyde 226.04
    sulfolane 190.5
    2,2,4-trimethylpentane 7.56
    2-methyltetrahydrofuran 266.73
    n-hexyl acetate 87.29
    isooctane 8.74
    2-(2-butoxyethoxy)ethanol 172.8
    sec-butyl acetate 59.52
    tert-butyl acetate 132.32
    decalin 5.63
    glycerin 154.05
    diglyme 286.75
    acrylic acid 89.95
    isopropyl myristate 41.1
    n-butyric acid 150.52
    acetyl acetate 65.81
    di(2-ethylhexyl) phthalate 32.99
    ethyl propionate 72.03
    nitromethane 272.53
    1,2-diethoxyethane 109.48
    benzonitrile 42.95
    trioctyl phosphate 34.84
    1-bromopropane 31.19
    gamma-valerolactone 239.69
    n-decanol 63.01
    triethyl phosphate 38.74
    4-methyl-2-pentanol 94.41
    propionitrile 96.46
    vinylene carbonate 79.18
    1,1,2-trichlorotrifluoroethane 153.14
    DMS 48.69
    cumene 20.56
    2-octanol 71.47
    2-hexanone 106.22
    octyl acetate 54.64
    limonene 29.0
    1,2-dimethoxyethane 368.45
    ethyl orthosilicate 40.61
    tributyl phosphate 33.66
    diacetone alcohol 188.96
    N,N-dimethylaniline 62.31
    acrylonitrile 100.52
    aniline 37.96
    1,3-propanediol 280.17
    bromobenzene 14.52
    dibromomethane 34.39
    1,1,2,2-tetrachloroethane 77.98
    2-methyl-cyclohexyl acetate 52.2
    tetrabutyl urea 43.07
    diisobutyl methanol 56.46
    2-phenylethanol 88.22
    styrene 15.71
    dioctyl adipate 45.9
    dimethyl sulfate 107.4
    ethyl butyrate 64.99
    methyl lactate 84.22
    butyl lactate 52.55
    diethyl carbonate 42.99
    propanediol butyl ether 107.5
    triethyl orthoformate 47.91
    p-tert-butyltoluene 24.37
    methyl 4-tert-butylbenzoate 79.72
    morpholine 379.09
    tert-butylamine 175.69
    n-dodecanol 47.82
    dimethoxymethane 318.5
    ethylene carbonate 73.69
    cyrene 103.33
    2-ethoxyethyl acetate 85.71
    2-ethylhexyl acetate 50.99
    1,2,4-trichlorobenzene 28.95
    4-methylpyridine 62.73
    dibutyl ether 62.48
    2,6-dimethyl-4-heptanol 56.46
    DEF 120.78
    dimethyl isosorbide 167.71
    tetrachloroethylene 65.66
    eugenol 90.14
    triacetin 57.33
    span 80 85.54
    1,4-butanediol 135.18
    1,1-dichloroethane 58.96
    2-methyl-1-pentanol 120.17
    methyl formate 168.24
    2-methyl-1-butanol 133.97
    n-decane 10.1
    butyronitrile 101.97
    3,7-dimethyl-1-octanol 75.95
    1-chlorooctane 38.15
    1-chlorotetradecane 15.8
    n-nonane 9.16
    undecane 7.65
    tert-butylcyclohexane 9.52
    cyclooctane 2.34
    cyclopentanol 126.78
    tetrahydropyran 197.68
    tert-amyl methyl ether 125.75
    2,5,8-trioxanonane 194.47
    1-hexene 31.71
    2-isopropoxyethanol 228.25
    2,2,2-trifluoroethanol 100.02
    methyl butyrate 92.75

    Scent© AI

1 4

IFRA standard 51

Recommendation
No restriction
Maximum acceptable concentrations in the finished product (%)
Category 1
Products applied to the lips
 No restriction Category 7A
Rinse-off products applied to the hair with some hand contact
 No restriction
Category 2
Products applied to the axillae
 No restriction Category 7B
Leave-on products applied to the hair with some hand contact
 No restriction
Category 3
Products applied to the face/body using fingertips
 No restriction Category 8
Products with significant anogenital exposure
 No restriction
Category 4
Products related to fine fragrance
 No restriction Category 9
Products with body and hand exposure, primarily rinse off
 No restriction
Category 5A
Body lotion products applied to the body using the hands (palms), primarily leave on
 No restriction Category 10A
Household care products with mostly hand contact
 No restriction
Category 5B
Face moisturizer products applied to the face using the hands (palms), primarily leave on
 No restriction Category 10B
Household care products with mostly hand contact, including aerosol/spray products (with potential leave-on skin contact)
 No restriction
Category 5C
Hand cream products applied to the hands using the hands (palms), primarily leave on
 No restriction Category 11A
Products with intended skin contact but minimal transfer of fragrance to skin from inert substrate without UV exposure
 No restriction
Category 5D
Baby Creams, baby Oils and baby talc
 No restriction Category 11B
Products with intended skin contact but minimal transfer of fragrance to skin from inert substrate with potential UV exposure
 No restriction
Category 6
Products with oral and lip exposure
 No restriction Category 12
Products not intended for direct skin contact, minimal or insignificant transfer to skin
 No restriction