2,5-Dimethyl-6,7-dihydro-5H-cyclopentapyrazine

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  • Identifiers

    CAS number
    38917-61-2

    Molecular formula
    C9H12N2

    SMILES
    CC1CCC2=NC(=CN=C12)C

  • Odor profile

    Fragrance
    Roasted 83.56%
    Nutty 80.63%
    Earthy 66.12%
    Coffee 60.81%
    Burnt 58.85%
    Hazelnut 56.83%
    Musty 54.98%
    Cocoa 52.44%
    Potato 49.83%
    Popcorn 44.39%

     

    Flavor
    Roasted 56.03%
    Earthy 51.77%
    Potato 45.63%
    Nutty 41.28%
    Musty 41.16%
    Coffee 40.9%
    Roast 40.53%
    Nut 33.96%
    Cocoa 33.67%
    Peanut 33.65%

     

    Odor impact est.
    High

  • Properties

    XLogP3-AA
    1.2

    pKa est.
    4.93 (weak acid)

    Molecular weight
    148.2 g/mol

    Vapor pressure est.

    • hPa @ 20°C
    • hPa @ 25°C

    Evaporation rate
    Moderately slow

    Boiling point est.
    246°C

    Melting point expt.

    • 110.00 °C. @ 760.00 mm Hg

    Flash point

    • 92.86 ˚C est.

  • Synonyms

    • 38917-61-2
    • 5H-Cyclopentapyrazine, 6,7-dihydro-2,5-dimethyl-
    • 2,5-Dimethyl-6,7-dihydro-5H-cyclopentapyrazine
    • 6,7-Dihydro-2,5-dimethyl-5H-cyclopentapyrazine
    • 2,5-Dimethyl-6,7-dihydro-5H-cyclopenta[b]pyrazine
    • 3,7-dimethyl-6,7-dihydro-5H-cyclopenta[b]pyrazine
    • 2,5-dimethyl-5H,6H,7H-cyclopenta[b]pyrazine
    • DTXSID20959743
    • 2,5-Dimethyl-6,7-dihydro-(5H)-cyclopentapyrazine
    • 2,5-dimethyl-5H,6H,7H-cyclopenta(b)pyrazine
    • SCHEMBL18248472
    • CHEBI:193667
    • DTXCID901436368
    • AKOS006271521
    • NS00120823
    • 2,5-dimethyl-6,7-dihydro-[5h]-cyclopenta-pyrazine
    • 2,5-Dimethyl-6,7-dihydro-5H-cyclopenta[b]pyrazine #

  • Applications

    2,5-Dimethyl-6,7-dihydro-5H-cyclopentapyrazine (CAS 38917-61-2) is a useful building block in organic synthesis and pharmaceutical research; it is commonly considered an intermediate for the synthesis of heterocyclic drug-like compounds. It is often used as a scaffold-building unit for more complex pyrazine-containing molecules, supporting medicinal chemistry programs and lead-optimization efforts. In materials science, derivatives of the cyclopentapyrazine ring can be prepared to furnish functionalized compounds for polymers and specialty materials. It may serve as a reactive intermediate in coatings, inks, or adhesive formulations, enabling tailored performance properties. Applications are typically explored within the constraints of local regulations and formulation limits.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 248.81
    methanol 339.54
    isopropanol 155.82
    water 3.75
    ethyl acetate 213.03
    n-propanol 198.67
    acetone 243.74
    n-butanol 191.23
    acetonitrile 247.56
    DMF 312.6
    toluene 211.86
    isobutanol 171.19
    1,4-dioxane 351.43
    methyl acetate 214.75
    THF 471.04
    2-butanone 236.59
    n-pentanol 167.01
    sec-butanol 167.55
    n-hexane 33.51
    ethylene glycol 71.35
    NMP 329.33
    cyclohexane 58.95
    DMSO 233.8
    n-butyl acetate 304.43
    n-octanol 150.08
    chloroform 993.92
    n-propyl acetate 167.24
    acetic acid 250.52
    dichloromethane 983.25
    cyclohexanone 349.69
    propylene glycol 88.03
    isopropyl acetate 147.63
    DMAc 258.9
    2-ethoxyethanol 197.85
    isopentanol 181.91
    n-heptane 46.19
    ethyl formate 239.32
    1,2-dichloroethane 382.8
    n-hexanol 243.01
    2-methoxyethanol 270.75
    isobutyl acetate 133.94
    tetrachloromethane 213.44
    n-pentyl acetate 184.44
    transcutol 541.58
    n-heptanol 140.69
    ethylbenzene 130.92
    MIBK 139.96
    2-propoxyethanol 293.88
    tert-butanol 152.14
    MTBE 157.38
    2-butoxyethanol 200.68
    propionic acid 176.71
    o-xylene 148.49
    formic acid 110.43
    diethyl ether 171.34
    m-xylene 159.67
    p-xylene 181.93
    chlorobenzene 322.94
    dimethyl carbonate 104.02
    n-octane 25.95
    formamide 118.82
    cyclopentanone 377.54
    2-pentanone 196.69
    anisole 190.14
    cyclopentyl methyl ether 212.91
    gamma-butyrolactone 433.05
    1-methoxy-2-propanol 181.32
    pyridine 419.8
    3-pentanone 165.02
    furfural 500.98
    n-dodecane 27.71
    diethylene glycol 216.3
    diisopropyl ether 69.57
    tert-amyl alcohol 158.64
    acetylacetone 219.9
    n-hexadecane 30.68
    acetophenone 190.7
    methyl propionate 175.34
    isopentyl acetate 260.44
    trichloroethylene 779.89
    n-nonanol 125.86
    cyclohexanol 168.85
    benzyl alcohol 182.91
    2-ethylhexanol 167.51
    isooctanol 115.94
    dipropyl ether 148.71
    1,2-dichlorobenzene 304.69
    ethyl lactate 95.38
    propylene carbonate 325.31
    n-methylformamide 193.28
    2-pentanol 124.86
    n-pentane 36.66
    1-propoxy-2-propanol 202.19
    1-methoxy-2-propyl acetate 220.06
    2-(2-methoxypropoxy) propanol 190.92
    mesitylene 104.04
    ε-caprolactone 316.14
    p-cymene 119.31
    epichlorohydrin 462.94
    1,1,1-trichloroethane 381.45
    2-aminoethanol 122.19
    morpholine-4-carbaldehyde 331.36
    sulfolane 383.32
    2,2,4-trimethylpentane 30.13
    2-methyltetrahydrofuran 339.72
    n-hexyl acetate 238.3
    isooctane 21.63
    2-(2-butoxyethoxy)ethanol 243.43
    sec-butyl acetate 119.02
    tert-butyl acetate 136.36
    decalin 39.4
    glycerin 116.44
    diglyme 375.3
    acrylic acid 174.39
    isopropyl myristate 111.63
    n-butyric acid 242.3
    acetyl acetate 166.39
    di(2-ethylhexyl) phthalate 127.53
    ethyl propionate 138.52
    nitromethane 302.88
    1,2-diethoxyethane 240.91
    benzonitrile 342.14
    trioctyl phosphate 94.51
    1-bromopropane 263.43
    gamma-valerolactone 438.87
    n-decanol 100.82
    triethyl phosphate 96.81
    4-methyl-2-pentanol 92.45
    propionitrile 219.99
    vinylene carbonate 349.4
    1,1,2-trichlorotrifluoroethane 271.32
    DMS 190.5
    cumene 104.4
    2-octanol 106.27
    2-hexanone 171.72
    octyl acetate 139.92
    limonene 140.55
    1,2-dimethoxyethane 303.11
    ethyl orthosilicate 94.29
    tributyl phosphate 118.1
    diacetone alcohol 141.84
    N,N-dimethylaniline 149.36
    acrylonitrile 269.28
    aniline 199.43
    1,3-propanediol 162.14
    bromobenzene 379.33
    dibromomethane 615.3
    1,1,2,2-tetrachloroethane 512.27
    2-methyl-cyclohexyl acetate 161.98
    tetrabutyl urea 134.44
    diisobutyl methanol 88.55
    2-phenylethanol 222.13
    styrene 156.23
    dioctyl adipate 146.63
    dimethyl sulfate 137.29
    ethyl butyrate 193.44
    methyl lactate 99.9
    butyl lactate 142.67
    diethyl carbonate 146.32
    propanediol butyl ether 178.98
    triethyl orthoformate 131.26
    p-tert-butyltoluene 102.76
    methyl 4-tert-butylbenzoate 179.38
    morpholine 303.94
    tert-butylamine 126.24
    n-dodecanol 86.07
    dimethoxymethane 226.77
    ethylene carbonate 266.52
    cyrene 161.69
    2-ethoxyethyl acetate 225.29
    2-ethylhexyl acetate 212.0
    1,2,4-trichlorobenzene 323.35
    4-methylpyridine 380.17
    dibutyl ether 164.31
    2,6-dimethyl-4-heptanol 88.55
    DEF 217.65
    dimethyl isosorbide 286.89
    tetrachloroethylene 405.84
    eugenol 195.8
    triacetin 191.93
    span 80 175.18
    1,4-butanediol 101.83
    1,1-dichloroethane 390.58
    2-methyl-1-pentanol 173.73
    methyl formate 205.46
    2-methyl-1-butanol 181.74
    n-decane 38.84
    butyronitrile 268.13
    3,7-dimethyl-1-octanol 138.44
    1-chlorooctane 124.08
    1-chlorotetradecane 59.64
    n-nonane 37.46
    undecane 31.82
    tert-butylcyclohexane 36.69
    cyclooctane 26.35
    cyclopentanol 187.42
    tetrahydropyran 298.36
    tert-amyl methyl ether 132.86
    2,5,8-trioxanonane 270.12
    1-hexene 101.57
    2-isopropoxyethanol 145.9
    2,2,2-trifluoroethanol 107.29
    methyl butyrate 192.65

    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