2-(2-Pentenyl)cyclopentanone, (2E)-

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  • Identifiers

    CAS number
    51608-18-5

    Molecular formula
    C10H16O

    SMILES
    CC/C=C/CC1CCCC1=O

  • Odor profile

    Fragrance
    Floral 81.72%
    Jasmin 77.86%
    Fruity 74.04%
    Coconut 55.2%
    Green 54.37%
    Lactonic 54.32%
    Peach 49.76%
    Waxy 47.34%
    Oily 47.25%
    Herbal 46.25%

     

    Flavor
    Herbal 51.74%
    Fresh 46.48%
    Fatty 39.98%
    Spicy 37.13%
    Spice 35.0%
    Oily 33.23%
    Green 31.4%
    Floral 29.23%
    Woody 26.97%
    Jasmin 25.67%

     

    Odor impact est.
    Medium

  • Properties

    XLogP3-AA
    2.2

    pKa est.
    7.93 (neutral)

    Molecular weight
    152.23 g/mol

    Vapor pressure est.

    • hPa @ 20°C
    • hPa @ 25°C

    Evaporation rate
    Moderate

    Boiling point est.
    229°C

    Flash point

    • 86.54 ˚C est.

    Solubility expt.

    • Practically insoluble or insoluble in water
    • Slightly soluble (in ethanol)

  • Synonyms

    • 2-(trans-2-Pentenyl)cyclopentanone
    • 51608-18-5
    • (E)-2-(Pent-2-enyl)cyclopentan-1-one
    • 2-(2-Pentenyl)cyclopentanone, (2E)-
    • 2-[(E)-pent-2-enyl]cyclopentan-1-one
    • 2QR3Z9GTKN
    • EINECS 257-319-5
    • Cyclopentanone, 2-(2E)-2-pentenyl-
    • Cyclopentanone, 2-(2E)-2-penten-1-yl-
    • Cyclopentanone, 2-(2-pentenyl)-, (E)-
    • FEMA NO. 4284
    • DTXSID901014938
    • Cyclopentanone,2-(2E)-2-penten-1-yl-
    • 2-(2-PENTENYL)CYCLOPENTANONE, TRANS-
    • 2-(TRANS-2-PENTENYL)CYCLOPENTANONE [FHFI]
    • 2-[(2E)-PENT-2-EN-1-YL]CYCLOPENTAN-1-ONE
    • jasminone
    • 2-((2E)-pent-2-en-1-yl)cyclopentan-1-one
    • JASMINONE B
    • UNII-2QR3Z9GTKN
    • SCHEMBL3504998
    • SCHEMBL11419135
    • DTXCID10909954
    • CHEBI:171911
    • ZIJOSCABGITYIL-ONEGZZNKSA-N
    • 2-(2E)-2-Pentenyl-Cyclopentanone
    • (2E)-2-(2-pentenyl)cyclopentanone
    • 2-(2E)-2-Penten-1-ylcyclopentanone
    • 3-oxo-2-(pent-2'-enyl) cyclopentane
    • 2-(2E)-2-Penten-1-yl-Cyclopentanone
    • DB-266528
    • DB-278482
    • NS00057279
    • Q27255490
    • 257-319-5

  • Applications

    2-(2-Pentenyl)cyclopentanone, (2E)-, CAS 51608-18-5 is used primarily as a fragrance intermediate and odorant precursor in perfumery, with applications in cosmetics and personal care formulations; it is also evaluated for use in household products such as air fresheners and cleaners to impart scent. In industrial manufacturing it can serve as a reactive intermediate for the synthesis of specialty polymers and resins, and it may be incorporated in coatings and inks as a fragrance additive or scent-release component; its use is typically governed by local regulations and formulation limits.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 3423.34
    methanol 3531.52
    isopropanol 2860.7
    water 0.99
    ethyl acetate 3669.54
    n-propanol 2601.29
    acetone 3911.05
    n-butanol 2658.84
    acetonitrile 4113.85
    DMF 2496.53
    toluene 2080.79
    isobutanol 2117.06
    1,4-dioxane 4032.93
    methyl acetate 2495.81
    THF 3897.19
    2-butanone 3119.87
    n-pentanol 1791.58
    sec-butanol 2276.77
    n-hexane 669.46
    ethylene glycol 350.85
    NMP 1703.76
    cyclohexane 806.53
    DMSO 2493.64
    n-butyl acetate 3006.67
    n-octanol 808.09
    chloroform 8657.92
    n-propyl acetate 2192.92
    acetic acid 2128.18
    dichloromethane 6774.4
    cyclohexanone 3422.22
    propylene glycol 584.76
    isopropyl acetate 2304.76
    DMAc 1705.74
    2-ethoxyethanol 1571.34
    isopentanol 2699.95
    n-heptane 268.03
    ethyl formate 1766.3
    1,2-dichloroethane 3838.48
    n-hexanol 1996.34
    2-methoxyethanol 2375.74
    isobutyl acetate 1348.92
    tetrachloromethane 1485.44
    n-pentyl acetate 1415.29
    transcutol 7854.65
    n-heptanol 748.0
    ethylbenzene 1035.82
    MIBK 1666.29
    2-propoxyethanol 2199.22
    tert-butanol 2958.67
    MTBE 3397.84
    2-butoxyethanol 1232.03
    propionic acid 1713.71
    o-xylene 906.1
    formic acid 544.26
    diethyl ether 3800.09
    m-xylene 1110.89
    p-xylene 1173.09
    chlorobenzene 2542.99
    dimethyl carbonate 661.26
    n-octane 100.3
    formamide 853.11
    cyclopentanone 2944.67
    2-pentanone 2800.61
    anisole 1797.24
    cyclopentyl methyl ether 2195.21
    gamma-butyrolactone 3067.7
    1-methoxy-2-propanol 1888.3
    pyridine 4520.58
    3-pentanone 1882.49
    furfural 2689.56
    n-dodecane 69.83
    diethylene glycol 1208.52
    diisopropyl ether 1077.67
    tert-amyl alcohol 2215.41
    acetylacetone 2381.18
    n-hexadecane 83.75
    acetophenone 1398.36
    methyl propionate 1867.78
    isopentyl acetate 2340.12
    trichloroethylene 7155.6
    n-nonanol 665.79
    cyclohexanol 2102.59
    benzyl alcohol 1359.44
    2-ethylhexanol 1168.78
    isooctanol 650.96
    dipropyl ether 1426.13
    1,2-dichlorobenzene 1891.61
    ethyl lactate 568.1
    propylene carbonate 1936.4
    n-methylformamide 1432.75
    2-pentanol 1988.16
    n-pentane 513.63
    1-propoxy-2-propanol 1618.43
    1-methoxy-2-propyl acetate 1753.45
    2-(2-methoxypropoxy) propanol 1164.72
    mesitylene 670.53
    ε-caprolactone 2851.71
    p-cymene 486.23
    epichlorohydrin 3777.13
    1,1,1-trichloroethane 4323.83
    2-aminoethanol 907.67
    morpholine-4-carbaldehyde 2175.23
    sulfolane 2332.1
    2,2,4-trimethylpentane 228.31
    2-methyltetrahydrofuran 3731.89
    n-hexyl acetate 1836.52
    isooctane 226.63
    2-(2-butoxyethoxy)ethanol 1742.77
    sec-butyl acetate 1487.41
    tert-butyl acetate 1944.98
    decalin 329.14
    glycerin 652.28
    diglyme 2966.87
    acrylic acid 1304.98
    isopropyl myristate 584.1
    n-butyric acid 3281.8
    acetyl acetate 1739.46
    di(2-ethylhexyl) phthalate 495.2
    ethyl propionate 1626.16
    nitromethane 2841.95
    1,2-diethoxyethane 2903.42
    benzonitrile 2421.34
    trioctyl phosphate 334.36
    1-bromopropane 3053.67
    gamma-valerolactone 3299.96
    n-decanol 459.25
    triethyl phosphate 454.35
    4-methyl-2-pentanol 1100.1
    propionitrile 2859.41
    vinylene carbonate 1883.44
    1,1,2-trichlorotrifluoroethane 2199.68
    DMS 1148.36
    cumene 630.75
    2-octanol 565.9
    2-hexanone 2219.52
    octyl acetate 681.73
    limonene 734.69
    1,2-dimethoxyethane 2864.3
    ethyl orthosilicate 492.51
    tributyl phosphate 491.67
    diacetone alcohol 1457.82
    N,N-dimethylaniline 962.59
    acrylonitrile 2871.89
    aniline 2168.65
    1,3-propanediol 1382.97
    bromobenzene 2885.3
    dibromomethane 5044.69
    1,1,2,2-tetrachloroethane 4930.88
    2-methyl-cyclohexyl acetate 928.77
    tetrabutyl urea 534.02
    diisobutyl methanol 657.4
    2-phenylethanol 1290.88
    styrene 1578.08
    dioctyl adipate 728.65
    dimethyl sulfate 745.53
    ethyl butyrate 1627.19
    methyl lactate 670.88
    butyl lactate 832.9
    diethyl carbonate 938.6
    propanediol butyl ether 1149.05
    triethyl orthoformate 901.13
    p-tert-butyltoluene 461.18
    methyl 4-tert-butylbenzoate 895.85
    morpholine 4436.3
    tert-butylamine 2339.31
    n-dodecanol 330.55
    dimethoxymethane 1746.12
    ethylene carbonate 1656.88
    cyrene 710.53
    2-ethoxyethyl acetate 1734.05
    2-ethylhexyl acetate 1681.31
    1,2,4-trichlorobenzene 2065.02
    4-methylpyridine 4434.26
    dibutyl ether 1432.38
    2,6-dimethyl-4-heptanol 657.4
    DEF 2338.84
    dimethyl isosorbide 1433.39
    tetrachloroethylene 3462.11
    eugenol 911.33
    triacetin 1264.29
    span 80 976.69
    1,4-butanediol 558.1
    1,1-dichloroethane 5015.89
    2-methyl-1-pentanol 1682.91
    methyl formate 1013.42
    2-methyl-1-butanol 2223.55
    n-decane 135.33
    butyronitrile 3529.99
    3,7-dimethyl-1-octanol 902.9
    1-chlorooctane 592.33
    1-chlorotetradecane 209.97
    n-nonane 138.27
    undecane 92.26
    tert-butylcyclohexane 306.14
    cyclooctane 233.3
    cyclopentanol 1704.92
    tetrahydropyran 4407.61
    tert-amyl methyl ether 1771.89
    2,5,8-trioxanonane 1677.26
    1-hexene 2046.89
    2-isopropoxyethanol 1280.28
    2,2,2-trifluoroethanol 570.03
    methyl butyrate 2353.86

    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