2-Cyclopenten-1-one, 3-hydroxy-

Overview IFRA Request a quote

  • Identifiers

    CAS number
    5870-62-2

    Molecular formula
    C5H6O2

    SMILES
    C1CC(=O)C=C1O

    Safety labels

  • Odor profile

    Fragrance
    Caramellic 63.29%
    Sweet 48.53%
    Burnt 48.18%
    Nutty 42.59%
    Roasted 35.43%
    Buttery 29.13%
    Spicy 25.64%
    Odorless 24.59%
    Coumarinic 24.41%
    Coconut 22.36%

     

    Flavor
    Caramel 32.83%
    Maple 26.29%
    Phenolic 24.2%
    Maple syrup 22.5%
    Buttery 22.44%
    Cotton candy 21.95%
    Odorless 21.83%
    Extremely sweet 21.79%
    Fenugreek 21.78%
    Seedy 21.68%

     

    Odor impact est.
    High

  • Properties

    XLogP3-AA
    -0.1

    pKa est.
    8.36 (weak base)

    Molecular weight
    98.1 g/mol

    Vapor pressure est.

    • hPa @ 20°C
    • hPa @ 25°C

    Evaporation rate
    Moderately slow

    Boiling point est.
    222°C

    Flash point

    • 92.8 ˚C est.

  • Synonyms

    • 5870-62-2
    • 2-Cyclopenten-1-one, 3-hydroxy-
    • DTXSID10207402
    • RefChem:259953
    • DTXCID70129893
    • 3-hydroxycyclopent-2-en-1-one
    • 3-Hydroxycyclopent-2-enone
    • 2-Cyclopenten-1-one,3-hydroxy-
    • MFCD12028109
    • 3-hydroxy-cyclopentenone
    • 3-hydroxy-cyclopent-2-enone
    • SCHEMBL4502804
    • SCHEMBL9368368
    • CHEMBL1829794
    • SCHEMBL23421951
    • ALBB-008899
    • STK505650
    • AKOS000321761
    • CS-0319792
    • 5870-62-2

  • Applications

    2-Cyclopenten-1-one, 3-hydroxy- (CAS number: 5870-62-2) is primarily viewed as an organic synthesis intermediate with applications across fragrance and consumer chemical industries, serving as a building block for aroma compounds and fragrance precursors. It is commonly evaluated for use as a fragrance ingredient or odorant in perfumery and in cosmetics/personal care products. In industrial manufacturing, it is considered a reactive intermediate for the preparation of specialty chemicals and functional materials. It can also act as a cyclopentenone building block in polymer and materials chemistry, enabling functionalized polymers or surface treatments. Depending on local regulations and formulation limits, it may be considered for additional applications within the broader manufacturing sector.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 204.33
    methanol 387.87
    isopropanol 147.11
    water 372.94
    ethyl acetate 32.87
    n-propanol 115.97
    acetone 128.18
    n-butanol 85.82
    acetonitrile 85.6
    DMF 444.65
    toluene 2.89
    isobutanol 87.87
    1,4-dioxane 88.23
    methyl acetate 57.01
    THF 126.89
    2-butanone 63.88
    n-pentanol 70.12
    sec-butanol 93.26
    n-hexane 2.14
    ethylene glycol 240.4
    NMP 250.94
    cyclohexane 1.11
    DMSO 215.85
    n-butyl acetate 18.18
    n-octanol 39.76
    chloroform 31.31
    n-propyl acetate 29.53
    acetic acid 360.19
    dichloromethane 23.95
    cyclohexanone 51.98
    propylene glycol 266.7
    isopropyl acetate 23.3
    DMAc 312.66
    2-ethoxyethanol 171.92
    isopentanol 72.83
    n-heptane 1.96
    ethyl formate 39.37
    1,2-dichloroethane 12.79
    n-hexanol 43.1
    2-methoxyethanol 281.18
    isobutyl acetate 22.42
    tetrachloromethane 7.23
    n-pentyl acetate 21.73
    transcutol 338.95
    n-heptanol 35.98
    ethylbenzene 3.92
    MIBK 36.55
    2-propoxyethanol 116.51
    tert-butanol 142.56
    MTBE 36.18
    2-butoxyethanol 90.38
    propionic acid 151.23
    o-xylene 5.5
    formic acid 367.94
    diethyl ether 23.22
    m-xylene 5.5
    p-xylene 7.16
    chlorobenzene 6.27
    dimethyl carbonate 40.97
    n-octane 1.04
    formamide 353.06
    cyclopentanone 96.98
    2-pentanone 44.32
    anisole 28.52
    cyclopentyl methyl ether 33.7
    gamma-butyrolactone 120.4
    1-methoxy-2-propanol 199.74
    pyridine 29.71
    3-pentanone 28.08
    furfural 112.02
    n-dodecane 1.31
    diethylene glycol 177.83
    diisopropyl ether 9.04
    tert-amyl alcohol 100.47
    acetylacetone 57.39
    n-hexadecane 1.36
    acetophenone 34.73
    methyl propionate 44.48
    isopentyl acetate 19.73
    trichloroethylene 31.04
    n-nonanol 32.82
    cyclohexanol 38.43
    benzyl alcohol 40.63
    2-ethylhexanol 21.13
    isooctanol 29.59
    dipropyl ether 15.41
    1,2-dichlorobenzene 9.32
    ethyl lactate 43.97
    propylene carbonate 61.72
    n-methylformamide 222.61
    2-pentanol 50.42
    n-pentane 1.89
    1-propoxy-2-propanol 72.9
    1-methoxy-2-propyl acetate 34.7
    2-(2-methoxypropoxy) propanol 94.1
    mesitylene 5.2
    ε-caprolactone 55.0
    p-cymene 5.71
    epichlorohydrin 78.82
    1,1,1-trichloroethane 15.24
    2-aminoethanol 288.69
    morpholine-4-carbaldehyde 203.66
    sulfolane 139.54
    2,2,4-trimethylpentane 2.23
    2-methyltetrahydrofuran 59.62
    n-hexyl acetate 39.11
    isooctane 1.92
    2-(2-butoxyethoxy)ethanol 120.66
    sec-butyl acetate 19.97
    tert-butyl acetate 30.63
    decalin 1.71
    glycerin 365.18
    diglyme 174.05
    acrylic acid 170.01
    isopropyl myristate 14.69
    n-butyric acid 94.32
    acetyl acetate 27.92
    di(2-ethylhexyl) phthalate 24.51
    ethyl propionate 26.76
    nitromethane 299.2
    1,2-diethoxyethane 33.81
    benzonitrile 26.68
    trioctyl phosphate 18.26
    1-bromopropane 6.0
    gamma-valerolactone 140.25
    n-decanol 22.94
    triethyl phosphate 15.52
    4-methyl-2-pentanol 35.44
    propionitrile 45.71
    vinylene carbonate 56.18
    1,1,2-trichlorotrifluoroethane 135.46
    DMS 30.05
    cumene 5.85
    2-octanol 23.18
    2-hexanone 39.41
    octyl acetate 21.76
    limonene 7.7
    1,2-dimethoxyethane 135.83
    ethyl orthosilicate 14.51
    tributyl phosphate 20.03
    diacetone alcohol 84.55
    N,N-dimethylaniline 27.15
    acrylonitrile 65.31
    aniline 18.07
    1,3-propanediol 212.79
    bromobenzene 3.62
    dibromomethane 10.92
    1,1,2,2-tetrachloroethane 28.48
    2-methyl-cyclohexyl acetate 22.24
    tetrabutyl urea 29.46
    diisobutyl methanol 13.78
    2-phenylethanol 29.79
    styrene 4.06
    dioctyl adipate 26.83
    dimethyl sulfate 71.02
    ethyl butyrate 19.05
    methyl lactate 79.22
    butyl lactate 36.8
    diethyl carbonate 15.58
    propanediol butyl ether 126.42
    triethyl orthoformate 16.96
    p-tert-butyltoluene 5.72
    methyl 4-tert-butylbenzoate 48.01
    morpholine 122.92
    tert-butylamine 55.46
    n-dodecanol 16.01
    dimethoxymethane 110.61
    ethylene carbonate 40.36
    cyrene 93.78
    2-ethoxyethyl acetate 35.25
    2-ethylhexyl acetate 14.37
    1,2,4-trichlorobenzene 14.78
    4-methylpyridine 27.47
    dibutyl ether 16.68
    2,6-dimethyl-4-heptanol 13.78
    DEF 72.09
    dimethyl isosorbide 88.2
    tetrachloroethylene 19.69
    eugenol 60.87
    triacetin 53.51
    span 80 73.2
    1,4-butanediol 119.61
    1,1-dichloroethane 14.47
    2-methyl-1-pentanol 60.58
    methyl formate 123.83
    2-methyl-1-butanol 72.03
    n-decane 1.95
    butyronitrile 35.5
    3,7-dimethyl-1-octanol 31.39
    1-chlorooctane 8.13
    1-chlorotetradecane 3.53
    n-nonane 1.64
    undecane 1.53
    tert-butylcyclohexane 2.31
    cyclooctane 0.64
    cyclopentanol 68.92
    tetrahydropyran 36.53
    tert-amyl methyl ether 29.35
    2,5,8-trioxanonane 130.05
    1-hexene 6.92
    2-isopropoxyethanol 101.54
    2,2,2-trifluoroethanol 175.03
    methyl butyrate 38.35

    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