2,5-Di-t-pentylhydroquinone

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  • Identifiers

    CAS number
    79-74-3

    Molecular formula
    C16H26O2

    SMILES
    CCC(C)(C)C1=CC(=C(C=C1O)C(C)(C)CC)O

    Safety labels

    Irritant
    Irritant

    Environmental Hazard
    Environmental

  • Odor profile

    Fragrance
    Phenolic 58.34%
    Woody 46.62%
    Spicy 39.78%
    Leathery 38.93%
    Dry 37.2%
    Medicinal 32.05%
    Smoky 31.94%
    Burnt 30.55%
    Musk 29.61%
    Amber 26.02%

     

    Flavor
    Phenolic 45.12%
    Camphor 42.19%
    Woody 35.62%
    Musty 33.0%
    Mild 27.22%
    Medicinal 27.04%
    Spice 23.63%
    Creosote 22.62%
    Leather 22.48%
    Thymol 21.84%

     

    Odor impact est.
    Low

  • Properties

    XLogP3-AA
    5.6

    pKa est.
    9.85 (weak base)

    Molecular weight
    250.38 g/mol

    Vapor pressure est.

    • hPa @ 20°C
    • hPa @ 25°C

    Evaporation rate
    Ultra slow

    Boiling point est.
    362°C

    Melting point expt.

    • 179.4-180.4 °C

    Flash point

    • 169.4 ˚C est.

    Solubility expt.

    • SLIGHTLY SOL IN WATER; SOL IN ALCOHOL & BENZENE

  • Synonyms

    • 79-74-3
    • 2,5-Di-tert-amylhydroquinone
    • 2,5-Di-tert-pentylbenzene-1,4-diol
    • 2,5-Di-tert-pentylhydroquinone
    • Santovar A
    • Diamylhydroquinone
    • Antage DAH
    • USAF B-21
    • 1,4-Benzenediol, 2,5-bis(1,1-dimethylpropyl)-
    • 2,5-DI(TERT-AMYL)HYDROQUINONE
    • 2,5-Di-t-amylhydroquinone
    • 2,5-Bis(1,1-dimethylpropyl)hydroquinone
    • Hydroquinone, 2,5-di-tert-pentyl-
    • 2,5-DI-T-PENTYLHYDROQUINONE
    • Hydroquinone, 2,5-di-t-pentyl-
    • NSC 455
    • Hydroquinone, 2,5-di-tert-amyl-
    • 2,5-Di-tert-amylbenzene-1,4-diol
    • 2,5-Bis(1,1-dimethylpropyl)-1,4-benzenediol
    • HSDB 5231
    • EINECS 201-222-2
    • BRN 2214556
    • 19O4J76TTK
    • AI3-61041
    • NSC-455
    • EC 201-222-2
    • 3-06-00-04748 (Beilstein Handbook Reference)
    • DI-TERT-PENTYLHYDROQUINONE, 2,5-
    • 2,5-DI-T-PENTYLHYDROQUINONE [HSDB]
    • 2,5-DI-TERT-PENTYLHYDROQUINONE [MI]
    • 2,5Ditamylhydroquinone
    • 2,5Ditertamylhydroquinone
    • RefChem:444197
    • 2,5Ditertpentylhydroquinone
    • Hydroquinone, 2,5ditpentyl
    • Hydroquinone, 2,5ditertamyl
    • 2,5Ditertamylbenzene1,4diol
    • Hydroquinone, 2,5ditertpentyl
    • 2,5Ditertpentylbenzene1,4diol
    • 2,5Bis(1,1dimethylpropyl)hydroquinone
    • 2,5Bis(1,1dimethylpropyl)1,4benzenediol
    • 1,4Benzenediol, 2,5bis(1,1dimethylpropyl)
    • 201-222-2
    • Santouar A
    • 2,5-bis(2-methylbutan-2-yl)benzene-1,4-diol
    • Dahq
    • MFCD00027029
    • DTXSID5044992
    • Hydroquinone,5-di-tert-amyl-
    • 2,1-dimethylpropyl)hydroquinone
    • Hydroquinone,5-di-tert-pentyl-
    • 1, 2,5-bis(1,1-dimethylpropyl)-
    • 2,1-dimethylpropyl)-1,4-benzenediol
    • WLN: 2X1&1&R BQ EQ DX2&1&1
    • UNII-19O4J76TTK
    • Lowinox AH25
    • 2,5-bis(1,1-dimethylpropyl)benzene-1,4-diol
    • hydroquinone derivative, 5a
    • Oprea1_395030
    • SCHEMBL34690
    • 2,5-Di-t-amyl-p-hydroquinone
    • 2,5-di-tert-amyl-hydroquinone
    • CHEMBL594135
    • NSC455
    • 2,5-Di-tert.-pentylhydrochinon
    • DTXCID3024992
    • BDBM34117
    • NSC6267
    • NSC-6267
    • Tox21_301767
    • BBL002922
    • STK378237
    • AKOS005448322
    • 2,5-Ditert-pentyl-1,4-benzenediol #
    • CAS-79-74-3
    • NCGC00256161-01
    • NCGC00340536-01
    • VS-01261
    • CS-0319422
    • D0299
    • NS00008202
    • AB01333681-02
    • Q27252125
    • 79-74-3

  • Applications

    2,5-Di-t-pentylhydroquinone (CAS 79-74-3) is primarily used as a hindered phenolic antioxidant and thermal stabilizer for polymers, helping prevent oxidation during processing and service at elevated temperatures. Typical applications include: antioxidant/stabilizer for plastics and rubber to extend service life; antioxidant additive for lubricants and fuels; formulation additive for coatings and inks to improve oxidative stability; and an intermediate in the synthesis of antioxidant systems for plastics and rubbers.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 292.32
    methanol 291.91
    isopropanol 254.64
    water 0.23
    ethyl acetate 447.72
    n-propanol 303.41
    acetone 318.56
    n-butanol 307.47
    acetonitrile 158.6
    DMF 1058.47
    toluene 182.17
    isobutanol 246.58
    1,4-dioxane 693.75
    methyl acetate 347.07
    THF 1484.33
    2-butanone 438.58
    n-pentanol 200.93
    sec-butanol 257.21
    n-hexane 118.04
    ethylene glycol 50.65
    NMP 644.78
    cyclohexane 109.3
    DMSO 420.45
    n-butyl acetate 547.68
    n-octanol 180.33
    chloroform 500.52
    n-propyl acetate 267.0
    acetic acid 148.74
    dichloromethane 352.87
    cyclohexanone 584.12
    propylene glycol 78.94
    isopropyl acetate 402.32
    DMAc 848.64
    2-ethoxyethanol 257.47
    isopentanol 291.08
    n-heptane 68.77
    ethyl formate 196.78
    1,2-dichloroethane 456.31
    n-hexanol 486.49
    2-methoxyethanol 474.33
    isobutyl acetate 229.88
    tetrachloromethane 115.54
    n-pentyl acetate 295.31
    transcutol 626.4
    n-heptanol 227.55
    ethylbenzene 156.72
    MIBK 349.8
    2-propoxyethanol 708.24
    tert-butanol 447.61
    MTBE 672.67
    2-butoxyethanol 359.46
    propionic acid 178.81
    o-xylene 152.95
    formic acid 60.0
    diethyl ether 513.52
    m-xylene 188.74
    p-xylene 194.52
    chlorobenzene 237.78
    dimethyl carbonate 224.24
    n-octane 41.43
    formamide 116.62
    cyclopentanone 823.6
    2-pentanone 422.61
    anisole 277.12
    cyclopentyl methyl ether 594.35
    gamma-butyrolactone 753.59
    1-methoxy-2-propanol 454.6
    pyridine 369.48
    3-pentanone 372.86
    furfural 402.36
    n-dodecane 24.55
    diethylene glycol 337.68
    diisopropyl ether 253.61
    tert-amyl alcohol 402.72
    acetylacetone 417.53
    n-hexadecane 28.21
    acetophenone 214.77
    methyl propionate 403.24
    isopentyl acetate 558.94
    trichloroethylene 683.27
    n-nonanol 179.07
    cyclohexanol 252.65
    benzyl alcohol 136.88
    2-ethylhexanol 279.03
    isooctanol 186.71
    dipropyl ether 352.78
    1,2-dichlorobenzene 238.83
    ethyl lactate 129.07
    propylene carbonate 392.37
    n-methylformamide 334.81
    2-pentanol 249.97
    n-pentane 82.35
    1-propoxy-2-propanol 471.39
    1-methoxy-2-propyl acetate 558.4
    2-(2-methoxypropoxy) propanol 256.48
    mesitylene 142.85
    ε-caprolactone 509.79
    p-cymene 122.06
    epichlorohydrin 818.33
    1,1,1-trichloroethane 450.7
    2-aminoethanol 130.67
    morpholine-4-carbaldehyde 688.88
    sulfolane 746.25
    2,2,4-trimethylpentane 56.09
    2-methyltetrahydrofuran 787.47
    n-hexyl acetate 376.78
    isooctane 49.09
    2-(2-butoxyethoxy)ethanol 383.53
    sec-butyl acetate 255.23
    tert-butyl acetate 537.81
    decalin 71.65
    glycerin 111.3
    diglyme 644.65
    acrylic acid 128.52
    isopropyl myristate 163.58
    n-butyric acid 314.6
    acetyl acetate 247.68
    di(2-ethylhexyl) phthalate 120.27
    ethyl propionate 291.52
    nitromethane 292.86
    1,2-diethoxyethane 410.59
    benzonitrile 154.37
    trioctyl phosphate 111.67
    1-bromopropane 316.59
    gamma-valerolactone 853.05
    n-decanol 135.73
    triethyl phosphate 160.12
    4-methyl-2-pentanol 208.69
    propionitrile 244.34
    vinylene carbonate 305.68
    1,1,2-trichlorotrifluoroethane 364.52
    DMS 307.66
    cumene 129.86
    2-octanol 166.56
    2-hexanone 281.28
    octyl acetate 203.88
    limonene 180.39
    1,2-dimethoxyethane 646.28
    ethyl orthosilicate 165.04
    tributyl phosphate 133.74
    diacetone alcohol 438.98
    N,N-dimethylaniline 230.8
    acrylonitrile 246.22
    aniline 194.39
    1,3-propanediol 220.37
    bromobenzene 248.33
    dibromomethane 280.12
    1,1,2,2-tetrachloroethane 675.29
    2-methyl-cyclohexyl acetate 266.48
    tetrabutyl urea 179.27
    diisobutyl methanol 164.92
    2-phenylethanol 266.19
    styrene 145.21
    dioctyl adipate 170.87
    dimethyl sulfate 323.96
    ethyl butyrate 309.8
    methyl lactate 188.97
    butyl lactate 215.64
    diethyl carbonate 203.32
    propanediol butyl ether 219.48
    triethyl orthoformate 233.64
    p-tert-butyltoluene 143.32
    methyl 4-tert-butylbenzoate 276.4
    morpholine 771.03
    tert-butylamine 328.17
    n-dodecanol 102.88
    dimethoxymethane 617.79
    ethylene carbonate 300.08
    cyrene 228.4
    2-ethoxyethyl acetate 365.68
    2-ethylhexyl acetate 453.34
    1,2,4-trichlorobenzene 250.42
    4-methylpyridine 393.12
    dibutyl ether 232.67
    2,6-dimethyl-4-heptanol 164.92
    DEF 514.2
    dimethyl isosorbide 539.79
    tetrachloroethylene 403.6
    eugenol 228.18
    triacetin 224.35
    span 80 232.28
    1,4-butanediol 76.26
    1,1-dichloroethane 392.98
    2-methyl-1-pentanol 209.88
    methyl formate 230.03
    2-methyl-1-butanol 269.98
    n-decane 44.16
    butyronitrile 266.62
    3,7-dimethyl-1-octanol 191.19
    1-chlorooctane 155.35
    1-chlorotetradecane 64.97
    n-nonane 44.78
    undecane 32.24
    tert-butylcyclohexane 80.09
    cyclooctane 53.33
    cyclopentanol 291.43
    tetrahydropyran 783.22
    tert-amyl methyl ether 518.94
    2,5,8-trioxanonane 372.64
    1-hexene 244.49
    2-isopropoxyethanol 211.98
    2,2,2-trifluoroethanol 78.3
    methyl butyrate 337.87

    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