3-Penten-2-one, 4-hydroxy-

Overview IFRA Request a quote

  • Identifiers

    CAS number
    1522-20-9

    Molecular formula
    C5H8O2

    SMILES
    C/C(=C/C(=O)C)/O

    Safety labels

  • Odor profile

    Fragrance
    Sweet 66.52%
    Caramellic 50.67%
    Pungent 47.98%
    Fruity 46.8%
    Herbal 42.91%
    Burnt 41.4%
    Spicy 38.54%
    Sharp 38.4%
    Musty 37.76%
    Ethereal 37.73%

     

    Flavor
    Sweet 42.85%
    Pungent 39.3%
    Phenolic 38.34%
    Sharp 35.34%
    Acidic 30.6%
    Green 28.28%
    Dry 26.27%
    Dairy 25.19%
    Butter 24.86%
    Ethereal 24.19%

     

    Odor impact est.
    High

  • Properties

    XLogP3-AA
    0.8

    pKa est.
    9.17 (weak base)

    Molecular weight
    100.12 g/mol

    Vapor pressure est.

    • hPa @ 20°C
    • hPa @ 25°C

    Evaporation rate
    Moderate

    Boiling point est.
    201°C

    Flash point

    • 66.19 ˚C est.

  • Synonyms

    • 3-Penten-2-one, 4-hydroxy-
    • 1522-20-9
    • RefChem:935731
    • GlyTouCan:G04955LY
    • G04955LY
    • (Z)-4-hydroxypent-3-en-2-one
    • (3Z)-4-hydroxypent-3-en-2-one
    • (z)-4-hydroxy-3-penten-2-one
    • 26567-75-9
    • SCHEMBL3247
    • Z-2-Pentene-4-one-2-ol
    • SCHEMBL8910437
    • CHEBI:131370
    • (3Z)-4-hydroxy-3-penten-2-one
    • InChI=1/C5H8O2/c1-4(6)3-5(2)7/h3,6H,1-2H3/b4-3
    • 1522-20-9

  • Applications

    3-Penten-2-one, 4-hydroxy- (CAS 1522-20-9) is commonly used as an intermediate and fragrance-related ingredient in chemical supply chains. Real-world applications include fragrance components in perfumes and cosmetics; serving as a starting material or intermediate in fragrance and flavor chemistry; use in personal care and household products as a scent note or synthetic intermediate; application as an industrial intermediate for the synthesis of other odor-bearing organic compounds; and potential use in coatings and inks to impart fragrance.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 1518.51
    methanol 1925.16
    isopropanol 1193.74
    water 609.59
    ethyl acetate 540.48
    n-propanol 1034.61
    acetone 1167.28
    n-butanol 757.65
    acetonitrile 858.41
    DMF 1493.92
    toluene 76.63
    isobutanol 679.05
    1,4-dioxane 894.22
    methyl acetate 649.65
    THF 1531.15
    2-butanone 573.81
    n-pentanol 482.96
    sec-butanol 778.15
    n-hexane 91.91
    ethylene glycol 887.5
    NMP 985.79
    cyclohexane 51.7
    DMSO 745.51
    n-butyl acetate 154.45
    n-octanol 253.06
    chloroform 247.12
    n-propyl acetate 245.37
    acetic acid 1770.01
    dichloromethane 234.45
    cyclohexanone 450.5
    propylene glycol 929.9
    isopropyl acetate 277.75
    DMAc 1050.07
    2-ethoxyethanol 825.32
    isopentanol 492.16
    n-heptane 46.96
    ethyl formate 430.09
    1,2-dichloroethane 189.55
    n-hexanol 431.64
    2-methoxyethanol 1618.37
    isobutyl acetate 142.11
    tetrachloromethane 67.32
    n-pentyl acetate 128.98
    transcutol 1033.04
    n-heptanol 170.05
    ethylbenzene 47.11
    MIBK 277.32
    2-propoxyethanol 757.83
    tert-butanol 1196.39
    MTBE 491.27
    2-butoxyethanol 307.56
    propionic acid 886.06
    o-xylene 64.44
    formic acid 1146.92
    diethyl ether 593.6
    m-xylene 78.44
    p-xylene 63.76
    chlorobenzene 78.64
    dimethyl carbonate 263.37
    n-octane 19.34
    formamide 833.06
    cyclopentanone 670.42
    2-pentanone 511.53
    anisole 172.99
    cyclopentyl methyl ether 528.8
    gamma-butyrolactone 885.99
    1-methoxy-2-propanol 1130.83
    pyridine 267.24
    3-pentanone 315.03
    furfural 490.72
    n-dodecane 20.65
    diethylene glycol 777.33
    diisopropyl ether 152.05
    tert-amyl alcohol 687.4
    acetylacetone 486.2
    n-hexadecane 21.42
    acetophenone 139.2
    methyl propionate 495.84
    isopentyl acetate 122.76
    trichloroethylene 234.71
    n-nonanol 202.92
    cyclohexanol 461.07
    benzyl alcohol 182.0
    2-ethylhexanol 165.96
    isooctanol 123.37
    dipropyl ether 197.6
    1,2-dichlorobenzene 66.64
    ethyl lactate 182.79
    propylene carbonate 390.4
    n-methylformamide 984.64
    2-pentanol 512.8
    n-pentane 94.32
    1-propoxy-2-propanol 416.02
    1-methoxy-2-propyl acetate 229.19
    2-(2-methoxypropoxy) propanol 304.13
    mesitylene 52.69
    ε-caprolactone 447.63
    p-cymene 39.33
    epichlorohydrin 628.64
    1,1,1-trichloroethane 195.2
    2-aminoethanol 1091.12
    morpholine-4-carbaldehyde 983.13
    sulfolane 631.32
    2,2,4-trimethylpentane 38.41
    2-methyltetrahydrofuran 824.73
    n-hexyl acetate 255.35
    isooctane 33.89
    2-(2-butoxyethoxy)ethanol 453.51
    sec-butyl acetate 151.38
    tert-butyl acetate 285.25
    decalin 29.56
    glycerin 1099.87
    diglyme 595.17
    acrylic acid 720.99
    isopropyl myristate 102.55
    n-butyric acid 721.59
    acetyl acetate 319.65
    di(2-ethylhexyl) phthalate 95.47
    ethyl propionate 250.38
    nitromethane 1569.7
    1,2-diethoxyethane 240.4
    benzonitrile 159.59
    trioctyl phosphate 87.79
    1-bromopropane 157.59
    gamma-valerolactone 846.14
    n-decanol 147.78
    triethyl phosphate 73.39
    4-methyl-2-pentanol 240.29
    propionitrile 471.96
    vinylene carbonate 312.58
    1,1,2-trichlorotrifluoroethane 453.34
    DMS 189.91
    cumene 45.99
    2-octanol 134.31
    2-hexanone 275.77
    octyl acetate 147.34
    limonene 66.9
    1,2-dimethoxyethane 870.89
    ethyl orthosilicate 75.79
    tributyl phosphate 99.6
    diacetone alcohol 447.64
    N,N-dimethylaniline 126.85
    acrylonitrile 467.94
    aniline 192.92
    1,3-propanediol 1026.56
    bromobenzene 47.01
    dibromomethane 152.87
    1,1,2,2-tetrachloroethane 202.91
    2-methyl-cyclohexyl acetate 113.09
    tetrabutyl urea 132.32
    diisobutyl methanol 86.35
    2-phenylethanol 159.56
    styrene 52.64
    dioctyl adipate 144.23
    dimethyl sulfate 321.9
    ethyl butyrate 134.35
    methyl lactate 348.44
    butyl lactate 132.46
    diethyl carbonate 93.99
    propanediol butyl ether 360.06
    triethyl orthoformate 101.64
    p-tert-butyltoluene 42.91
    methyl 4-tert-butylbenzoate 182.64
    morpholine 1099.19
    tert-butylamine 604.87
    n-dodecanol 113.39
    dimethoxymethane 880.96
    ethylene carbonate 286.52
    cyrene 267.04
    2-ethoxyethyl acetate 189.12
    2-ethylhexyl acetate 89.98
    1,2,4-trichlorobenzene 92.11
    4-methylpyridine 285.69
    dibutyl ether 158.07
    2,6-dimethyl-4-heptanol 86.35
    DEF 501.4
    dimethyl isosorbide 372.91
    tetrachloroethylene 138.16
    eugenol 191.23
    triacetin 221.29
    span 80 284.43
    1,4-butanediol 455.54
    1,1-dichloroethane 253.97
    2-methyl-1-pentanol 308.09
    methyl formate 752.13
    2-methyl-1-butanol 483.57
    n-decane 33.23
    butyronitrile 422.5
    3,7-dimethyl-1-octanol 183.28
    1-chlorooctane 95.61
    1-chlorotetradecane 44.62
    n-nonane 34.16
    undecane 25.34
    tert-butylcyclohexane 40.94
    cyclooctane 21.8
    cyclopentanol 662.37
    tetrahydropyran 693.78
    tert-amyl methyl ether 333.53
    2,5,8-trioxanonane 446.8
    1-hexene 191.7
    2-isopropoxyethanol 475.51
    2,2,2-trifluoroethanol 611.93
    methyl butyrate 287.55

    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