4-Ethyl-1,2-benzenediol

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  • Identifiers

    CAS number
    1124-39-6

    Molecular formula
    C8H10O2

    SMILES
    CCC1=CC(=C(C=C1)O)O

    Safety labels

    Corrosive
    Corrosive

    Irritant
    Irritant

  • Odor profile

    Fragrance
    Phenolic 88.06%
    Smoky 67.21%
    Spicy 59.13%
    Medicinal 56.35%
    Burnt 54.88%
    Woody 40.52%
    Leathery 32.69%
    Vanilla 31.92%
    Balsamic 28.24%
    Clove 27.03%

     

    Flavor
    Phenolic 79.02%
    Medicinal 59.51%
    Smoky 47.76%
    Phenol 45.22%
    Smoke 44.61%
    Spicy 44.33%
    Bacon 40.12%
    Spice 38.45%
    Bitter 37.65%
    Clove 37.21%

     

    Odor impact est.
    Medium

  • Properties

    XLogP3-AA
    0.5

    pKa est.
    10.64 (weak base)

    Molecular weight
    138.16 g/mol

    Vapor pressure est.

    • hPa @ 20°C
    • hPa @ 25°C

    Evaporation rate
    Ultra slow

    Boiling point est.
    264°C

    Melting point expt.

    • 41 °C

    Flash point

    • 132.11 ˚C est.

  • Synonyms

    • 4-Ethylcatechol
    • 4-ethylbenzene-1,2-diol
    • 1124-39-6
    • 4-Ethyl-1,2-benzenediol
    • 574JV8BYR2
    • DTXSID50150029
    • RefChem:98899
    • DTXCID4072520
    • 214-397-5
    • 4-Ethylpyrocatechol
    • 3,4-Dihydroxyethylbenzene
    • MFCD00015847
    • 1,2-Benzenediol, 4-ethyl-
    • CHEMBL1276241
    • Benzenediol, 4-ethyl-
    • UNII-574JV8BYR2
    • EINECS 214-397-5
    • P-ETHYLCATECHOL
    • 4-Ethylcatechol, 95%
    • 4-Ethylpyrocatechol, 8CI
    • 1,2-Benzenediol,4-ethyl-
    • SCHEMBL56556
    • 4-Ethyl-1,2-benzenediol #
    • ETHYLPYROCATECHOL, 4-
    • SCHEMBL490700
    • orb1819070
    • SCHEMBL2378869
    • SCHEMBL9170318
    • SCHEMBL9176288
    • SCHEMBL14764213
    • SCHEMBL14764389
    • SCHEMBL30290839
    • HFLGBNBLMBSXEM-UHFFFAOYSA-
    • CHEBI:179260
    • BDBM50483042
    • AKOS016008639
    • EBC-610938
    • FE67275
    • HY-W265757
    • AS-39285
    • PD210595
    • SY101005
    • DB-041091
    • CS-0309130
    • NS00023642
    • 4-Ethylcatechol 100 microg/mL in Acetonitrile
    • 4-Ethylcatechol(Discontinued,See C4X-190825)
    • EN300-1599490
    • F237146
    • Q27261467
    • InChI=1/C8H10O2/c1-2-6-3-4-7(9)8(10)5-6/h3-5,9-10H,2H2,1H3
    • 8RU
    • 1124-39-6

  • Applications

    4-Ethyl-1,2-benzenediol (CAS 1124-39-6) is primarily used as a building block in organic synthesis; in industrial manufacturing it serves as an intermediate for dyes, pigments, and downstream pharmaceutical or agrochemical derivatives. In perfumery and cosmetics, it may function as an odorant or fragrance fixative, contributing to scent profile and longevity. In coatings, inks, and polymer formulations, it can act as a phenolic antioxidant/stabilizer to improve aging resistance and color stability. It may also be explored as a monomer or co-monomer in specialty polymer systems, affecting properties such as rigidity and crosslinking. In consumer care products, it may be present as a fragrance component or formulation additive, subject to regulatory limits.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 511.75
    methanol 362.28
    isopropanol 382.75
    water 1.22
    ethyl acetate 332.34
    n-propanol 377.29
    acetone 576.51
    n-butanol 260.89
    acetonitrile 408.75
    DMF 802.28
    toluene 37.49
    isobutanol 226.52
    1,4-dioxane 430.99
    methyl acetate 404.42
    THF 783.81
    2-butanone 430.39
    n-pentanol 146.6
    sec-butanol 269.02
    n-hexane 4.9
    ethylene glycol 130.29
    NMP 285.74
    cyclohexane 7.68
    DMSO 994.92
    n-butyl acetate 204.87
    n-octanol 101.99
    chloroform 178.5
    n-propyl acetate 150.01
    acetic acid 257.76
    dichloromethane 315.15
    cyclohexanone 240.44
    propylene glycol 127.21
    isopropyl acetate 137.2
    DMAc 435.61
    2-ethoxyethanol 266.6
    isopentanol 175.26
    n-heptane 14.63
    ethyl formate 241.95
    1,2-dichloroethane 266.55
    n-hexanol 219.63
    2-methoxyethanol 503.17
    isobutyl acetate 75.37
    tetrachloromethane 30.77
    n-pentyl acetate 102.94
    transcutol 448.1
    n-heptanol 113.08
    ethylbenzene 32.46
    MIBK 128.62
    2-propoxyethanol 332.67
    tert-butanol 442.16
    MTBE 270.83
    2-butoxyethanol 188.64
    propionic acid 237.55
    o-xylene 39.47
    formic acid 116.82
    diethyl ether 219.81
    m-xylene 45.05
    p-xylene 40.05
    chlorobenzene 73.84
    dimethyl carbonate 94.48
    n-octane 8.47
    formamide 339.69
    cyclopentanone 461.74
    2-pentanone 273.54
    anisole 109.67
    cyclopentyl methyl ether 151.94
    gamma-butyrolactone 527.46
    1-methoxy-2-propanol 345.51
    pyridine 208.12
    3-pentanone 163.46
    furfural 295.14
    n-dodecane 9.0
    diethylene glycol 249.91
    diisopropyl ether 49.21
    tert-amyl alcohol 305.34
    acetylacetone 252.46
    n-hexadecane 9.81
    acetophenone 97.74
    methyl propionate 249.71
    isopentyl acetate 157.8
    trichloroethylene 391.27
    n-nonanol 86.98
    cyclohexanol 104.11
    benzyl alcohol 87.43
    2-ethylhexanol 108.46
    isooctanol 84.83
    dipropyl ether 119.84
    1,2-dichlorobenzene 72.06
    ethyl lactate 77.75
    propylene carbonate 208.12
    n-methylformamide 458.81
    2-pentanol 145.2
    n-pentane 6.87
    1-propoxy-2-propanol 232.47
    1-methoxy-2-propyl acetate 174.59
    2-(2-methoxypropoxy) propanol 142.76
    mesitylene 32.57
    ε-caprolactone 209.2
    p-cymene 41.13
    epichlorohydrin 574.49
    1,1,1-trichloroethane 161.11
    2-aminoethanol 244.89
    morpholine-4-carbaldehyde 313.84
    sulfolane 480.13
    2,2,4-trimethylpentane 8.15
    2-methyltetrahydrofuran 371.97
    n-hexyl acetate 132.28
    isooctane 8.47
    2-(2-butoxyethoxy)ethanol 211.43
    sec-butyl acetate 79.5
    tert-butyl acetate 152.14
    decalin 8.0
    glycerin 157.78
    diglyme 364.1
    acrylic acid 169.3
    isopropyl myristate 58.16
    n-butyric acid 251.54
    acetyl acetate 119.74
    di(2-ethylhexyl) phthalate 53.28
    ethyl propionate 112.59
    nitromethane 583.39
    1,2-diethoxyethane 188.08
    benzonitrile 105.01
    trioctyl phosphate 51.37
    1-bromopropane 106.58
    gamma-valerolactone 417.87
    n-decanol 70.83
    triethyl phosphate 53.6
    4-methyl-2-pentanol 80.28
    propionitrile 251.73
    vinylene carbonate 171.23
    1,1,2-trichlorotrifluoroethane 221.06
    DMS 89.82
    cumene 30.16
    2-octanol 71.77
    2-hexanone 140.44
    octyl acetate 81.31
    limonene 56.2
    1,2-dimethoxyethane 369.11
    ethyl orthosilicate 51.61
    tributyl phosphate 52.16
    diacetone alcohol 213.7
    N,N-dimethylaniline 68.8
    acrylonitrile 322.49
    aniline 76.58
    1,3-propanediol 317.61
    bromobenzene 68.31
    dibromomethane 171.41
    1,1,2,2-tetrachloroethane 229.93
    2-methyl-cyclohexyl acetate 80.53
    tetrabutyl urea 72.04
    diisobutyl methanol 66.13
    2-phenylethanol 118.6
    styrene 35.74
    dioctyl adipate 76.72
    dimethyl sulfate 143.63
    ethyl butyrate 129.41
    methyl lactate 111.11
    butyl lactate 81.09
    diethyl carbonate 80.47
    propanediol butyl ether 141.95
    triethyl orthoformate 73.95
    p-tert-butyltoluene 42.11
    methyl 4-tert-butylbenzoate 113.44
    morpholine 481.75
    tert-butylamine 196.45
    n-dodecanol 56.17
    dimethoxymethane 358.2
    ethylene carbonate 139.24
    cyrene 117.35
    2-ethoxyethyl acetate 153.18
    2-ethylhexyl acetate 104.39
    1,2,4-trichlorobenzene 81.62
    4-methylpyridine 151.54
    dibutyl ether 79.57
    2,6-dimethyl-4-heptanol 66.13
    DEF 230.06
    dimethyl isosorbide 211.39
    tetrachloroethylene 134.18
    eugenol 113.98
    triacetin 109.97
    span 80 113.15
    1,4-butanediol 110.91
    1,1-dichloroethane 221.61
    2-methyl-1-pentanol 112.51
    methyl formate 333.58
    2-methyl-1-butanol 169.17
    n-decane 12.59
    butyronitrile 217.43
    3,7-dimethyl-1-octanol 85.48
    1-chlorooctane 51.21
    1-chlorotetradecane 24.52
    n-nonane 11.1
    undecane 10.7
    tert-butylcyclohexane 9.43
    cyclooctane 4.54
    cyclopentanol 171.38
    tetrahydropyran 288.78
    tert-amyl methyl ether 152.19
    2,5,8-trioxanonane 257.7
    1-hexene 28.48
    2-isopropoxyethanol 166.47
    2,2,2-trifluoroethanol 95.19
    methyl butyrate 159.72

    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