2-Ethyl-3-methylquinoxaline

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  • Identifiers

    CAS number
    37920-99-3

    Molecular formula
    C11H12N2

    SMILES
    CCC1=NC2=CC=CC=C2N=C1C

    Safety labels

  • Odor profile

    Fragrance
    Roasted 75.38%
    Nutty 69.12%
    Earthy 59.03%
    Burnt 57.25%
    Hazelnut 53.64%
    Coffee 51.82%
    Musty 49.77%
    Potato 43.39%
    Cocoa 42.82%
    Meaty 36.78%

     

    Flavor
    Nutty 61.61%
    Roasted 56.6%
    Coffee 49.5%
    Earthy 47.66%
    Potato 46.91%
    Roast 46.02%
    Musty 45.22%
    Cocoa 43.75%
    Hazelnut 42.94%
    Corn 38.22%

     

    Odor impact est.
    Medium

  • Properties

    XLogP3-AA
    2.4

    pKa est.
    3.98 (weak acid)

    Molecular weight
    172.23 g/mol

    Vapor pressure est.

    • hPa @ 20°C
    • hPa @ 25°C

    Evaporation rate
    Slow

    Boiling point est.
    282°C

    Flash point

    • 121.29 ˚C est.

  • Synonyms

    • 2-Ethyl-3-methylquinoxaline
    • 2-Methyl-3-ethylquinoxaline
    • 37920-99-3
    • Quinoxaline, 2-ethyl-3-methyl-
    • 3-Ethyl-2-methylquinoxaline
    • SCHEMBL3735430
    • NKVYZJCPYVRFKD-UHFFFAOYSA-N
    • MBA92099
    • DB-261299
    • CS-0250181
    • EN300-5003910
    • Z731122608
    • 37920-99-3

  • Applications

    2-Ethyl-3-methylquinoxaline (CAS 37920-99-3) is a versatile heterocyclic building block used in research and development across several sectors: it serves as an intermediate for synthesizing diverse quinoxaline derivatives in medicinal and agrochemical research; it is a precursor in the dye and pigment industry, and in coatings and inks where quinoxaline structures contribute color and lightfastness; in materials science it is explored as a small-molecule semiconductor for organic electronics (OLEDs, organic photovoltaics) and as a starting point for functional polymers and conducting materials; it also provides a ligand precursor in coordination chemistry and catalysis studies. Its actual use is typically as an intermediate or specialty chemical, and its handling and application are subject to local regulations and formulation limits.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 155.13
    methanol 150.58
    isopropanol 108.15
    water 0.54
    ethyl acetate 510.31
    n-propanol 151.97
    acetone 559.91
    n-butanol 164.48
    acetonitrile 376.0
    DMF 661.02
    toluene 392.32
    isobutanol 132.06
    1,4-dioxane 692.86
    methyl acetate 425.18
    THF 880.26
    2-butanone 436.09
    n-pentanol 151.19
    sec-butanol 136.39
    n-hexane 122.36
    ethylene glycol 21.57
    NMP 548.02
    cyclohexane 179.06
    DMSO 400.61
    n-butyl acetate 664.24
    n-octanol 159.17
    chloroform 1873.84
    n-propyl acetate 390.6
    acetic acid 216.87
    dichloromethane 2247.89
    cyclohexanone 709.44
    propylene glycol 23.22
    isopropyl acetate 254.69
    DMAc 442.62
    2-ethoxyethanol 183.79
    isopentanol 153.21
    n-heptane 107.68
    ethyl formate 421.87
    1,2-dichloroethane 1316.17
    n-hexanol 228.59
    2-methoxyethanol 250.27
    isobutyl acetate 248.77
    tetrachloromethane 349.99
    n-pentyl acetate 338.8
    transcutol 579.13
    n-heptanol 146.42
    ethylbenzene 258.71
    MIBK 209.26
    2-propoxyethanol 275.73
    tert-butanol 130.95
    MTBE 209.95
    2-butoxyethanol 200.97
    propionic acid 175.32
    o-xylene 241.75
    formic acid 51.59
    diethyl ether 439.64
    m-xylene 259.19
    p-xylene 344.95
    chlorobenzene 553.63
    dimethyl carbonate 214.3
    n-octane 61.52
    formamide 115.61
    cyclopentanone 788.41
    2-pentanone 371.41
    anisole 304.93
    cyclopentyl methyl ether 451.43
    gamma-butyrolactone 927.13
    1-methoxy-2-propanol 154.83
    pyridine 793.7
    3-pentanone 379.69
    furfural 737.54
    n-dodecane 40.39
    diethylene glycol 129.81
    diisopropyl ether 119.32
    tert-amyl alcohol 140.88
    acetylacetone 442.48
    n-hexadecane 46.81
    acetophenone 306.76
    methyl propionate 384.71
    isopentyl acetate 434.44
    trichloroethylene 1950.35
    n-nonanol 144.81
    cyclohexanol 194.15
    benzyl alcohol 200.68
    2-ethylhexanol 194.37
    isooctanol 117.72
    dipropyl ether 340.99
    1,2-dichlorobenzene 503.4
    ethyl lactate 111.19
    propylene carbonate 537.94
    n-methylformamide 302.72
    2-pentanol 114.7
    n-pentane 89.59
    1-propoxy-2-propanol 212.16
    1-methoxy-2-propyl acetate 317.5
    2-(2-methoxypropoxy) propanol 170.33
    mesitylene 156.84
    ε-caprolactone 549.96
    p-cymene 173.68
    epichlorohydrin 1008.24
    1,1,1-trichloroethane 867.3
    2-aminoethanol 49.65
    morpholine-4-carbaldehyde 511.85
    sulfolane 734.47
    2,2,4-trimethylpentane 38.08
    2-methyltetrahydrofuran 602.07
    n-hexyl acetate 398.48
    isooctane 25.68
    2-(2-butoxyethoxy)ethanol 236.24
    sec-butyl acetate 213.66
    tert-butyl acetate 217.18
    decalin 77.73
    glycerin 36.48
    diglyme 526.82
    acrylic acid 163.62
    isopropyl myristate 152.14
    n-butyric acid 289.24
    acetyl acetate 308.16
    di(2-ethylhexyl) phthalate 128.13
    ethyl propionate 339.15
    nitromethane 513.92
    1,2-diethoxyethane 482.6
    benzonitrile 429.0
    trioctyl phosphate 102.97
    1-bromopropane 638.16
    gamma-valerolactone 761.58
    n-decanol 113.36
    triethyl phosphate 158.94
    4-methyl-2-pentanol 78.76
    propionitrile 336.49
    vinylene carbonate 546.52
    1,1,2-trichlorotrifluoroethane 336.52
    DMS 326.67
    cumene 163.03
    2-octanol 124.4
    2-hexanone 346.62
    octyl acetate 198.72
    limonene 210.55
    1,2-dimethoxyethane 579.13
    ethyl orthosilicate 154.74
    tributyl phosphate 143.93
    diacetone alcohol 163.53
    N,N-dimethylaniline 229.22
    acrylonitrile 420.9
    aniline 269.67
    1,3-propanediol 101.11
    bromobenzene 692.95
    dibromomethane 1447.61
    1,1,2,2-tetrachloroethane 1265.99
    2-methyl-cyclohexyl acetate 237.99
    tetrabutyl urea 180.37
    diisobutyl methanol 104.85
    2-phenylethanol 240.93
    styrene 313.88
    dioctyl adipate 192.87
    dimethyl sulfate 249.55
    ethyl butyrate 399.21
    methyl lactate 92.21
    butyl lactate 168.92
    diethyl carbonate 280.71
    propanediol butyl ether 131.07
    triethyl orthoformate 234.97
    p-tert-butyltoluene 143.99
    methyl 4-tert-butylbenzoate 220.54
    morpholine 536.42
    tert-butylamine 110.96
    n-dodecanol 91.56
    dimethoxymethane 471.86
    ethylene carbonate 475.55
    cyrene 168.32
    2-ethoxyethyl acetate 380.03
    2-ethylhexyl acetate 399.44
    1,2,4-trichlorobenzene 500.01
    4-methylpyridine 689.99
    dibutyl ether 348.42
    2,6-dimethyl-4-heptanol 104.85
    DEF 455.19
    dimethyl isosorbide 349.81
    tetrachloroethylene 1051.28
    eugenol 210.73
    triacetin 258.44
    span 80 152.77
    1,4-butanediol 51.72
    1,1-dichloroethane 888.37
    2-methyl-1-pentanol 154.47
    methyl formate 338.52
    2-methyl-1-butanol 152.44
    n-decane 67.38
    butyronitrile 375.7
    3,7-dimethyl-1-octanol 129.12
    1-chlorooctane 214.5
    1-chlorotetradecane 84.57
    n-nonane 72.08
    undecane 50.68
    tert-butylcyclohexane 62.01
    cyclooctane 68.13
    cyclopentanol 207.94
    tetrahydropyran 641.94
    tert-amyl methyl ether 184.19
    2,5,8-trioxanonane 322.93
    1-hexene 278.39
    2-isopropoxyethanol 144.27
    2,2,2-trifluoroethanol 97.85
    methyl butyrate 459.82

    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