2-Isopropyl-5-methoxypyrazine

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  • Identifiers

    CAS number
    56891-99-7

    Molecular formula
    C8H12N2O

    SMILES
    CC(C)C1=CN=C(C=N1)OC

    Safety labels

  • Odor profile

    Fragrance
    Green 89.47%
    Earthy 71.4%
    Nutty 66.64%
    Vegetable 61.03%
    Roasted 45.7%
    Potato 43.85%
    Musty 40.97%
    Cocoa 38.59%
    Leafy 37.35%
    Woody 35.95%

     

    Flavor
    Earthy 51.16%
    Green 50.96%
    Earth 41.84%
    Pepper 39.75%
    Musty 36.87%
    Pea 34.61%
    Nutty 31.18%
    Bell 30.2%
    Roasted 29.27%
    Potato 28.87%

     

    Odor impact est.
    High

  • Properties

    XLogP3-AA
    1.2

    pKa est.
    5.09 (weak acid)

    Molecular weight
    152.19 g/mol

    Vapor pressure est.

    • hPa @ 20°C
    • hPa @ 25°C

    Evaporation rate
    Moderate

    Boiling point est.
    224°C

    Flash point

    • 105.46 ˚C est.

  • Synonyms

    • 2-Isopropyl-5-methoxypyrazine
    • 56891-99-7
    • Pyrazine, 2-methoxy-5-(1-methylethyl)-
    • 2-methoxy-5-(propan-2-yl)pyrazine
    • 5E1J7NVT2N
    • 2-methoxy-5-isopropylpyrazine
    • FEMA NO. 3358, 5-METHOXY-
    • RefChem:473900
    • 2-methoxy-5-propan-2-ylpyrazine
    • 2-methoxy-5-propan-2-yl-pyrazine
    • UNII-5E1J7NVT2N
    • 2-Methoxy-5-(1-methylethyl)pyrazine
    • SCHEMBL179314
    • DTXSID4069139
    • SCHEMBL31472465
    • CHEBI:193686
    • GSVQZEKWEURMLP-UHFFFAOYSA-N
    • DB-293252
    • NS00121735
    • Q27261898
    • 56891-99-7

  • Applications

    2-Isopropyl-5-methoxypyrazine (CAS 56891-99-7) is a highly potent green-pepper odorant used primarily as an aroma ingredient in fragrances. In the flavor and processed-food sector, it provides distinctive green pepper notes for savory products and beverages. In cosmetics and personal care, it may be used as a fragrance component to impart herbaceous, fresh character. In household products such as cleaners and air fresheners, it may be included to deliver the green-pepper aroma. Its use is subject to local regulations and formulation limits.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 181.43
    methanol 229.87
    isopropanol 94.47
    water 3.17
    ethyl acetate 283.19
    n-propanol 123.13
    acetone 241.45
    n-butanol 121.82
    acetonitrile 206.89
    DMF 337.02
    toluene 83.37
    isobutanol 96.18
    1,4-dioxane 327.04
    methyl acetate 266.53
    THF 427.73
    2-butanone 184.11
    n-pentanol 66.48
    sec-butanol 88.67
    n-hexane 4.26
    ethylene glycol 72.71
    NMP 445.11
    cyclohexane 17.09
    DMSO 361.28
    n-butyl acetate 178.68
    n-octanol 27.42
    chloroform 754.49
    n-propyl acetate 110.09
    acetic acid 789.76
    dichloromethane 751.84
    cyclohexanone 406.48
    propylene glycol 65.91
    isopropyl acetate 124.02
    DMAc 311.42
    2-ethoxyethanol 170.7
    isopentanol 112.53
    n-heptane 4.25
    ethyl formate 266.5
    1,2-dichloroethane 416.51
    n-hexanol 85.03
    2-methoxyethanol 408.65
    isobutyl acetate 65.78
    tetrachloromethane 120.58
    n-pentyl acetate 74.05
    transcutol 496.84
    n-heptanol 38.86
    ethylbenzene 31.9
    MIBK 73.1
    2-propoxyethanol 194.66
    tert-butanol 138.16
    MTBE 116.1
    2-butoxyethanol 104.1
    propionic acid 265.49
    o-xylene 57.25
    formic acid 349.12
    diethyl ether 96.04
    m-xylene 53.18
    p-xylene 58.57
    chlorobenzene 235.52
    dimethyl carbonate 102.84
    n-octane 1.7
    formamide 491.31
    cyclopentanone 415.09
    2-pentanone 128.74
    anisole 88.59
    cyclopentyl methyl ether 162.53
    gamma-butyrolactone 608.71
    1-methoxy-2-propanol 199.64
    pyridine 393.57
    3-pentanone 106.46
    furfural 683.43
    n-dodecane 1.65
    diethylene glycol 190.69
    diisopropyl ether 25.04
    tert-amyl alcohol 122.0
    acetylacetone 213.51
    n-hexadecane 1.96
    acetophenone 113.62
    methyl propionate 185.45
    isopentyl acetate 156.28
    trichloroethylene 1169.85
    n-nonanol 26.75
    cyclohexanol 152.03
    benzyl alcohol 114.6
    2-ethylhexanol 57.98
    isooctanol 33.94
    dipropyl ether 40.89
    1,2-dichlorobenzene 227.41
    ethyl lactate 63.41
    propylene carbonate 374.91
    n-methylformamide 267.89
    2-pentanol 63.46
    n-pentane 5.22
    1-propoxy-2-propanol 118.18
    1-methoxy-2-propyl acetate 172.75
    2-(2-methoxypropoxy) propanol 100.25
    mesitylene 32.37
    ε-caprolactone 378.15
    p-cymene 34.88
    epichlorohydrin 646.19
    1,1,1-trichloroethane 427.28
    2-aminoethanol 120.1
    morpholine-4-carbaldehyde 406.86
    sulfolane 574.75
    2,2,4-trimethylpentane 7.16
    2-methyltetrahydrofuran 330.97
    n-hexyl acetate 94.4
    isooctane 3.87
    2-(2-butoxyethoxy)ethanol 141.64
    sec-butyl acetate 68.48
    tert-butyl acetate 126.58
    decalin 8.58
    glycerin 130.28
    diglyme 276.42
    acrylic acid 312.2
    isopropyl myristate 30.84
    n-butyric acid 397.41
    acetyl acetate 269.75
    di(2-ethylhexyl) phthalate 53.63
    ethyl propionate 94.14
    nitromethane 936.8
    1,2-diethoxyethane 117.28
    benzonitrile 180.73
    trioctyl phosphate 33.03
    1-bromopropane 127.46
    gamma-valerolactone 603.05
    n-decanol 19.45
    triethyl phosphate 63.04
    4-methyl-2-pentanol 39.1
    propionitrile 131.34
    vinylene carbonate 375.71
    1,1,2-trichlorotrifluoroethane 522.74
    DMS 120.66
    cumene 26.63
    2-octanol 22.47
    2-hexanone 78.66
    octyl acetate 43.96
    limonene 51.11
    1,2-dimethoxyethane 207.09
    ethyl orthosilicate 61.47
    tributyl phosphate 47.76
    diacetone alcohol 149.44
    N,N-dimethylaniline 58.17
    acrylonitrile 216.15
    aniline 185.41
    1,3-propanediol 201.09
    bromobenzene 210.27
    dibromomethane 364.99
    1,1,2,2-tetrachloroethane 725.4
    2-methyl-cyclohexyl acetate 96.83
    tetrabutyl urea 51.7
    diisobutyl methanol 31.63
    2-phenylethanol 120.98
    styrene 43.65
    dioctyl adipate 62.44
    dimethyl sulfate 170.29
    ethyl butyrate 106.63
    methyl lactate 104.59
    butyl lactate 67.64
    diethyl carbonate 92.37
    propanediol butyl ether 77.73
    triethyl orthoformate 81.97
    p-tert-butyltoluene 32.91
    methyl 4-tert-butylbenzoate 95.39
    morpholine 395.51
    tert-butylamine 69.7
    n-dodecanol 14.74
    dimethoxymethane 184.04
    ethylene carbonate 289.15
    cyrene 121.76
    2-ethoxyethyl acetate 136.08
    2-ethylhexyl acetate 120.39
    1,2,4-trichlorobenzene 270.33
    4-methylpyridine 317.37
    dibutyl ether 32.95
    2,6-dimethyl-4-heptanol 31.63
    DEF 205.59
    dimethyl isosorbide 203.16
    tetrachloroethylene 541.36
    eugenol 96.36
    triacetin 112.1
    span 80 85.15
    1,4-butanediol 56.15
    1,1-dichloroethane 340.28
    2-methyl-1-pentanol 76.73
    methyl formate 269.34
    2-methyl-1-butanol 105.74
    n-decane 2.45
    butyronitrile 138.6
    3,7-dimethyl-1-octanol 36.69
    1-chlorooctane 18.16
    1-chlorotetradecane 7.9
    n-nonane 2.04
    undecane 1.97
    tert-butylcyclohexane 7.02
    cyclooctane 4.16
    cyclopentanol 170.23
    tetrahydropyran 242.94
    tert-amyl methyl ether 86.03
    2,5,8-trioxanonane 173.7
    1-hexene 20.65
    2-isopropoxyethanol 95.83
    2,2,2-trifluoroethanol 328.55
    methyl butyrate 143.23

    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