2-Cyclopenten-1-one, 2-pentyl-

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  • Identifiers

    CAS number
    25564-22-1

    Molecular formula
    C10H16O

    SMILES
    CCCCCC1=CCCC1=O

    Safety labels

    Irritant
    Irritant

  • Odor profile

    Fragrance
    Fruity 89.15%
    Floral 88.12%
    Jasmin 81.32%
    Herbal 66.77%
    Woody 62.15%
    Spicy 51.59%
    Fresh 50.3%
    Sweet 49.04%
    Green 48.66%
    Waxy 38.3%

     

    Flavor
    Herbal 76.08%
    Fresh 46.97%
    Woody 42.61%
    Spicy 41.14%
    Spice 37.79%
    Celery 37.5%
    Jasmin 37.11%
    Fatty 30.59%
    Floral 26.96%
    Oily 26.77%

     

    Odor impact est.
    Medium

  • Properties

    XLogP3-AA
    3.0

    pKa est.
    8.44 (weak base)

    Molecular weight
    152.23 g/mol

    Vapor pressure est.

    • hPa @ 20°C
    • hPa @ 25°C

    Evaporation rate
    Moderately slow

    Boiling point est.
    231°C

    Flash point

    • 87.48 ˚C est.

  • Synonyms

    • 2-Pentyl-2-cyclopenten-1-one
    • 25564-22-1
    • 2-Pentylcyclopent-2-en-1-one
    • 2-Cyclopenten-1-one, 2-pentyl-
    • Amyl cyclopentenone
    • 2-Pentyl-2-Cyclopentene-1-One
    • BRN 1857975
    • 2-pentyl-2-cyclopentenone
    • EINECS 247-104-4
    • 1UOK9N9N72
    • DTXSID6029331
    • 2-pentylcyclopent-2-enone
    • DTXCID809331
    • 2-pentyl-cyclopent-2-en-1-one
    • EC 247-104-4
    • 4-07-00-00195 (Beilstein Handbook Reference)
    • MFCD00036631
    • CAS-25564-22-1
    • UNII-1UOK9N9N72
    • amylcyclopentenone
    • 2Pentylcyclopent2en1one
    • 2Cyclopenten1one, 2pentyl
    • 2-pentyl-cyclopent-2-enone
    • 2-n-pentyl-2-cyclopentenone
    • 2-Amyl 2-cyclopenten-1-one
    • SCHEMBL357488
    • CHEMBL3183509
    • 2-Cyclopenten-1-one,2-pentyl-
    • 2-n-pentyl-cyclopent-2-en-1-one
    • ABA56422
    • Tox21_201738
    • Tox21_303448
    • BBL009816
    • STL145849
    • AKOS000120813
    • NCGC00249109-01
    • NCGC00257294-01
    • NCGC00259287-01
    • SY052082
    • VS-02198
    • DB-049940
    • CS-0152312
    • NS00002834
    • P1142
    • EN300-18643
    • D84134
    • Q27252921
    • 247-104-4

  • Applications

    2-Cyclopenten-1-one, 2-pentyl-, CAS 25564-22-1 is a cyclopentenone derivative with practical applications across several industries. In the fragrance and flavor sectors, it is used as an odorant and flavor/aroma ingredient; in cosmetics and personal care, it serves as a fragrance component; in industrial manufacturing, it is commonly evaluated as a synthetic building block and intermediate for pharmaceuticals and other specialty chemicals; in polymers, plastics and coatings, it can function as a reactive monomer or precursor for resin systems and inks; in adhesives and sealants, it can act as a polymerizable intermediate for toughened polymer networks.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 5823.71
    methanol 6706.75
    isopropanol 5130.06
    water 0.67
    ethyl acetate 7114.38
    n-propanol 4864.88
    acetone 8836.48
    n-butanol 4782.08
    acetonitrile 8481.33
    DMF 5997.16
    toluene 3417.42
    isobutanol 4172.6
    1,4-dioxane 6593.85
    methyl acetate 4805.1
    THF 6440.12
    2-butanone 6206.99
    n-pentanol 2994.32
    sec-butanol 4175.66
    n-hexane 1149.21
    ethylene glycol 561.1
    NMP 3288.7
    cyclohexane 1339.72
    DMSO 4536.76
    n-butyl acetate 5573.59
    n-octanol 1206.78
    chloroform 12455.75
    n-propyl acetate 3992.58
    acetic acid 3673.54
    dichloromethane 10644.69
    cyclohexanone 6663.77
    propylene glycol 890.62
    isopropyl acetate 4343.46
    DMAc 3151.75
    2-ethoxyethanol 2610.31
    isopentanol 4880.96
    n-heptane 374.63
    ethyl formate 3270.41
    1,2-dichloroethane 7021.56
    n-hexanol 3451.63
    2-methoxyethanol 4454.61
    isobutyl acetate 2329.63
    tetrachloromethane 2195.63
    n-pentyl acetate 2485.42
    transcutol 12404.45
    n-heptanol 1182.61
    ethylbenzene 1721.74
    MIBK 2977.37
    2-propoxyethanol 3701.34
    tert-butanol 5572.94
    MTBE 7058.89
    2-butoxyethanol 1961.9
    propionic acid 3039.35
    o-xylene 1429.26
    formic acid 880.54
    diethyl ether 7737.92
    m-xylene 1783.09
    p-xylene 1919.02
    chlorobenzene 4344.71
    dimethyl carbonate 1204.02
    n-octane 146.64
    formamide 1567.8
    cyclopentanone 5449.24
    2-pentanone 5630.4
    anisole 2930.67
    cyclopentyl methyl ether 3891.53
    gamma-butyrolactone 5258.2
    1-methoxy-2-propanol 3366.96
    pyridine 8031.59
    3-pentanone 3650.37
    furfural 4308.75
    n-dodecane 95.37
    diethylene glycol 1871.62
    diisopropyl ether 2018.71
    tert-amyl alcohol 4246.58
    acetylacetone 4482.73
    n-hexadecane 116.84
    acetophenone 2227.03
    methyl propionate 3632.94
    isopentyl acetate 4183.93
    trichloroethylene 12054.99
    n-nonanol 1003.39
    cyclohexanol 3749.68
    benzyl alcohol 2161.97
    2-ethylhexanol 1927.98
    isooctanol 1037.59
    dipropyl ether 2472.33
    1,2-dichlorobenzene 3135.27
    ethyl lactate 875.72
    propylene carbonate 3038.12
    n-methylformamide 3130.3
    2-pentanol 3487.95
    n-pentane 838.64
    1-propoxy-2-propanol 2711.61
    1-methoxy-2-propyl acetate 3023.9
    2-(2-methoxypropoxy) propanol 1671.69
    mesitylene 1035.56
    ε-caprolactone 5243.23
    p-cymene 708.65
    epichlorohydrin 6521.04
    1,1,1-trichloroethane 7264.17
    2-aminoethanol 1549.52
    morpholine-4-carbaldehyde 3885.01
    sulfolane 4015.1
    2,2,4-trimethylpentane 333.43
    2-methyltetrahydrofuran 6297.43
    n-hexyl acetate 3110.34
    isooctane 324.82
    2-(2-butoxyethoxy)ethanol 2528.3
    sec-butyl acetate 2604.81
    tert-butyl acetate 3570.39
    decalin 520.28
    glycerin 984.14
    diglyme 4400.43
    acrylic acid 2196.38
    isopropyl myristate 916.09
    n-butyric acid 5790.2
    acetyl acetate 2926.54
    di(2-ethylhexyl) phthalate 697.89
    ethyl propionate 2964.06
    nitromethane 5750.67
    1,2-diethoxyethane 5247.6
    benzonitrile 4029.42
    trioctyl phosphate 490.38
    1-bromopropane 5432.12
    gamma-valerolactone 5817.96
    n-decanol 689.35
    triethyl phosphate 658.51
    4-methyl-2-pentanol 1773.79
    propionitrile 5991.0
    vinylene carbonate 2964.29
    1,1,2-trichlorotrifluoroethane 3589.18
    DMS 1943.45
    cumene 980.36
    2-octanol 917.69
    2-hexanone 3989.53
    octyl acetate 1093.35
    limonene 1152.22
    1,2-dimethoxyethane 5253.45
    ethyl orthosilicate 730.51
    tributyl phosphate 745.2
    diacetone alcohol 2551.32
    N,N-dimethylaniline 1512.42
    acrylonitrile 5738.51
    aniline 3789.58
    1,3-propanediol 2371.76
    bromobenzene 4714.76
    dibromomethane 7857.85
    1,1,2,2-tetrachloroethane 8373.35
    2-methyl-cyclohexyl acetate 1391.27
    tetrabutyl urea 844.34
    diisobutyl methanol 1004.43
    2-phenylethanol 2044.38
    styrene 2713.4
    dioctyl adipate 1086.37
    dimethyl sulfate 1337.62
    ethyl butyrate 2636.81
    methyl lactate 1086.42
    butyl lactate 1354.9
    diethyl carbonate 1450.98
    propanediol butyl ether 1727.09
    triethyl orthoformate 1433.48
    p-tert-butyltoluene 665.62
    methyl 4-tert-butylbenzoate 1308.53
    morpholine 8105.09
    tert-butylamine 4383.58
    n-dodecanol 487.75
    dimethoxymethane 3623.07
    ethylene carbonate 2707.24
    cyrene 975.22
    2-ethoxyethyl acetate 2957.54
    2-ethylhexyl acetate 2953.48
    1,2,4-trichlorobenzene 3261.35
    4-methylpyridine 8284.27
    dibutyl ether 2445.2
    2,6-dimethyl-4-heptanol 1004.43
    DEF 5121.48
    dimethyl isosorbide 2094.99
    tetrachloroethylene 5877.1
    eugenol 1347.4
    triacetin 1875.66
    span 80 1435.71
    1,4-butanediol 886.36
    1,1-dichloroethane 9086.92
    2-methyl-1-pentanol 2891.09
    methyl formate 2115.62
    2-methyl-1-butanol 4181.6
    n-decane 188.0
    butyronitrile 6762.74
    3,7-dimethyl-1-octanol 1395.45
    1-chlorooctane 940.31
    1-chlorotetradecane 313.12
    n-nonane 194.21
    undecane 126.31
    tert-butylcyclohexane 480.56
    cyclooctane 355.51
    cyclopentanol 2938.42
    tetrahydropyran 8259.6
    tert-amyl methyl ether 3468.53
    2,5,8-trioxanonane 2411.26
    1-hexene 3667.86
    2-isopropoxyethanol 2141.88
    2,2,2-trifluoroethanol 914.24
    methyl butyrate 4495.44

    Scent© AI

1 4

IFRA standard 51

Recommendation
Prohibition
Maximum acceptable concentrations in the finished product (%)
Category 1
Products applied to the lips
 0 % Category 7A
Rinse-off products applied to the hair with some hand contact
 0 %
Category 2
Products applied to the axillae
 0 % Category 7B
Leave-on products applied to the hair with some hand contact
 0 %
Category 3
Products applied to the face/body using fingertips
 0 % Category 8
Products with significant anogenital exposure
 0 %
Category 4
Products related to fine fragrance
 0 % Category 9
Products with body and hand exposure, primarily rinse off
 0 %
Category 5A
Body lotion products applied to the body using the hands (palms), primarily leave on
 0 % Category 10A
Household care products with mostly hand contact
 0 %
Category 5B
Face moisturizer products applied to the face using the hands (palms), primarily leave on
 0 % Category 10B
Household care products with mostly hand contact, including aerosol/spray products (with potential leave-on skin contact)
 0 %
Category 5C
Hand cream products applied to the hands using the hands (palms), primarily leave on
 0 % Category 11A
Products with intended skin contact but minimal transfer of fragrance to skin from inert substrate without UV exposure
 0 %
Category 5D
Baby Creams, baby Oils and baby talc
 0 % Category 11B
Products with intended skin contact but minimal transfer of fragrance to skin from inert substrate with potential UV exposure
 0 %
Category 6
Products with oral and lip exposure
 0 % Category 12
Products not intended for direct skin contact, minimal or insignificant transfer to skin
 0 %

Prohibition
Amylcyclopentenone should not be used as a fragrance ingredient.