Cyclopentene, 1-pentyl-

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  • Identifiers

    CAS number
    4291-98-9

    Molecular formula
    C10H18

    SMILES
    CCCCCC1=CCCC1

    Safety labels

  • Odor profile

    Fragrance
    Waxy 39.31%
    Sweet 36.98%
    Citrus 36.31%
    Gassy 31.53%
    Fatty 24.95%
    Oily 24.29%
    Woody 23.76%
    Green 22.49%
    Dry 21.52%
    Spicy 21.41%

     

    Flavor
    Alkane 26.54%
    Waxy 25.57%
    Diterpene 21.88%
    Low 21.35%
    Terpentine 20.47%
    Wood 20.22%
    Slightly waxy 20.13%
    Citric 19.83%
    Fruity 19.81%
    Citrus peel 19.79%

     

    Odor impact est.
    High

  • Properties

    XLogP3-AA
    3.9

    pKa est.
    9.72 (weak base)

    Molecular weight
    138.25 g/mol

    Vapor pressure est.

    • hPa @ 20°C
    • hPa @ 25°C

    Evaporation rate
    Fast

    Boiling point est.
    185°C

    Flash point

    • 49.89 ˚C est.

  • Synonyms

    • Cyclopentene, 1-pentyl-
    • 4291-98-9
    • DTXSID60195562
    • RefChem:1082730
    • DTXCID00118053
    • 1-Pentylcyclopentene
    • 1-Amyl-1-cyclopentene
    • 1-pentylcyclopent-1-ene
    • 1-Pentyl-1-cyclopentene
    • 1-Pentylcyclopentene-1
    • SCHEMBL1423814
    • SCHEMBL2070277
    • SCHEMBL7485551
    • SCHEMBL9208004
    • SCHEMBL9213136
    • QCNVZKGTZWZQPR-UHFFFAOYSA-N
    • 4291-98-9

  • Applications

    Cyclopentene, 1-pentyl-, CAS 4291-98-9 serves as a precursor and intermediate in multiple industrial synthesis schemes. It is commonly treated as an alkenyl-building block for fragrance and cosmetic compounds, supporting applications in perfumery and personal care. Additionally, it is used as a synthetic precursor for specialty chemicals in the plastics and polymers sector, and may function as a monomer or building block for coatings, paints, and inks formulations. In industrial manufacturing, it is evaluated as a building block for more complex molecules, and in coatings/inks contexts it can appear as a reactive component. It is sometimes considered as an intermediate in pharmaceutical synthesis, subject to regulatory and formulation limits.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 3454.33
    methanol 1643.67
    isopropanol 3578.23
    water 0.04
    ethyl acetate 7030.5
    n-propanol 3454.12
    acetone 4583.74
    n-butanol 4645.18
    acetonitrile 3053.78
    DMF 1536.21
    toluene 5349.39
    isobutanol 2767.19
    1,4-dioxane 9370.66
    methyl acetate 3302.33
    THF 12462.78
    2-butanone 4605.38
    n-pentanol 3084.19
    sec-butanol 3968.81
    n-hexane 7211.53
    ethylene glycol 210.38
    NMP 1334.61
    cyclohexane 9201.8
    DMSO 2554.1
    n-butyl acetate 12360.38
    n-octanol 2133.36
    chloroform 9162.2
    n-propyl acetate 3958.31
    acetic acid 1280.92
    dichloromethane 7713.84
    cyclohexanone 5624.47
    propylene glycol 490.18
    isopropyl acetate 4946.53
    DMAc 1383.46
    2-ethoxyethanol 2025.45
    isopentanol 4653.47
    n-heptane 8579.36
    ethyl formate 1697.4
    1,2-dichloroethane 6056.35
    n-hexanol 8080.55
    2-methoxyethanol 2798.67
    isobutyl acetate 2625.43
    tetrachloromethane 2399.4
    n-pentyl acetate 3262.96
    transcutol 9619.34
    n-heptanol 2192.38
    ethylbenzene 2271.26
    MIBK 3901.47
    2-propoxyethanol 5587.22
    tert-butanol 5634.74
    MTBE 10403.84
    2-butoxyethanol 2224.81
    propionic acid 1434.53
    o-xylene 2116.17
    formic acid 128.17
    diethyl ether 15098.88
    m-xylene 2796.27
    p-xylene 2150.62
    chlorobenzene 3086.35
    dimethyl carbonate 652.12
    n-octane 1548.52
    formamide 218.91
    cyclopentanone 4231.83
    2-pentanone 5633.16
    anisole 2721.71
    cyclopentyl methyl ether 7563.02
    gamma-butyrolactone 3029.58
    1-methoxy-2-propanol 2745.07
    pyridine 6343.62
    3-pentanone 3910.96
    furfural 1926.73
    n-dodecane 639.07
    diethylene glycol 1584.85
    diisopropyl ether 5908.25
    tert-amyl alcohol 4688.97
    acetylacetone 3414.87
    n-hexadecane 760.19
    acetophenone 1431.65
    methyl propionate 2839.04
    isopentyl acetate 8309.08
    trichloroethylene 6467.51
    n-nonanol 1899.35
    cyclohexanol 4264.4
    benzyl alcohol 1220.79
    2-ethylhexanol 7044.06
    isooctanol 1834.55
    dipropyl ether 16593.35
    1,2-dichlorobenzene 2144.47
    ethyl lactate 655.98
    propylene carbonate 2097.55
    n-methylformamide 705.91
    2-pentanol 4452.25
    n-pentane 5644.73
    1-propoxy-2-propanol 5980.94
    1-methoxy-2-propyl acetate 4735.12
    2-(2-methoxypropoxy) propanol 1669.92
    mesitylene 1864.84
    ε-caprolactone 4433.06
    p-cymene 2262.12
    epichlorohydrin 4839.54
    1,1,1-trichloroethane 6674.17
    2-aminoethanol 628.2
    morpholine-4-carbaldehyde 2264.32
    sulfolane 2468.2
    2,2,4-trimethylpentane 1365.75
    2-methyltetrahydrofuran 11251.83
    n-hexyl acetate 4140.42
    isooctane 1513.59
    2-(2-butoxyethoxy)ethanol 2763.54
    sec-butyl acetate 2999.33
    tert-butyl acetate 4880.0
    decalin 1985.92
    glycerin 459.09
    diglyme 5142.68
    acrylic acid 751.62
    isopropyl myristate 1618.75
    n-butyric acid 4059.19
    acetyl acetate 2795.76
    di(2-ethylhexyl) phthalate 786.52
    ethyl propionate 3112.99
    nitromethane 1663.46
    1,2-diethoxyethane 10467.06
    benzonitrile 2146.24
    trioctyl phosphate 701.86
    1-bromopropane 9282.12
    gamma-valerolactone 3644.63
    n-decanol 1378.58
    triethyl phosphate 1209.75
    4-methyl-2-pentanol 2664.37
    propionitrile 3917.77
    vinylene carbonate 1464.93
    1,1,2-trichlorotrifluoroethane 1962.33
    DMS 1328.32
    cumene 1305.01
    2-octanol 1559.51
    2-hexanone 4439.49
    octyl acetate 1802.47
    limonene 4780.15
    1,2-dimethoxyethane 6033.8
    ethyl orthosilicate 1549.7
    tributyl phosphate 999.55
    diacetone alcohol 2571.19
    N,N-dimethylaniline 1409.61
    acrylonitrile 2412.09
    aniline 2715.81
    1,3-propanediol 1276.75
    bromobenzene 4107.4
    dibromomethane 7663.94
    1,1,2,2-tetrachloroethane 5744.81
    2-methyl-cyclohexyl acetate 2875.93
    tetrabutyl urea 1153.71
    diisobutyl methanol 3451.97
    2-phenylethanol 2483.32
    styrene 2771.5
    dioctyl adipate 1521.0
    dimethyl sulfate 618.82
    ethyl butyrate 7045.01
    methyl lactate 607.85
    butyl lactate 1213.42
    diethyl carbonate 2862.54
    propanediol butyl ether 1154.03
    triethyl orthoformate 3984.34
    p-tert-butyltoluene 2106.93
    methyl 4-tert-butylbenzoate 1194.28
    morpholine 9384.24
    tert-butylamine 6002.77
    n-dodecanol 1106.02
    dimethoxymethane 3017.42
    ethylene carbonate 1828.47
    cyrene 709.4
    2-ethoxyethyl acetate 3041.17
    2-ethylhexyl acetate 7185.51
    1,2,4-trichlorobenzene 2098.92
    4-methylpyridine 5648.23
    dibutyl ether 8703.08
    2,6-dimethyl-4-heptanol 3451.97
    DEF 3810.62
    dimethyl isosorbide 2392.3
    tetrachloroethylene 3863.2
    eugenol 901.53
    triacetin 1631.19
    span 80 1745.41
    1,4-butanediol 419.61
    1,1-dichloroethane 6911.06
    2-methyl-1-pentanol 3105.98
    methyl formate 515.54
    2-methyl-1-butanol 3719.3
    n-decane 1349.46
    butyronitrile 5843.63
    3,7-dimethyl-1-octanol 2871.26
    1-chlorooctane 2741.05
    1-chlorotetradecane 967.14
    n-nonane 1697.47
    undecane 857.56
    tert-butylcyclohexane 1636.95
    cyclooctane 3467.97
    cyclopentanol 2813.86
    tetrahydropyran 15848.45
    tert-amyl methyl ether 5954.42
    2,5,8-trioxanonane 2834.78
    1-hexene 11298.18
    2-isopropoxyethanol 1891.68
    2,2,2-trifluoroethanol 215.74
    methyl butyrate 3732.81

    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