9-Undecenoic acid

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  • Identifiers

    CAS number
    37973-84-5

    Molecular formula
    C11H20O2

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

    Safety labels

  • Odor profile

    Fragrance
    Fatty 84.37%
    Waxy 72.21%
    Green 70.22%
    Dairy 51.98%
    Oily 49.98%
    Fruity 47.15%
    Citrus 41.6%
    Milky 39.41%
    Floral 37.8%
    Creamy 36.17%

     

    Flavor
    Fatty 64.38%
    Waxy 57.69%
    Green 37.42%
    Oily 36.88%
    Fruity 35.26%
    Fat 34.3%
    Sweet 31.7%
    Creamy 30.41%
    Soapy 28.96%
    Citrus 28.09%

     

    Odor impact est.
    Medium

  • Properties

    XLogP3-AA
    3.6

    pKa est.
    7.8 (neutral)

    Molecular weight
    184.27 g/mol

    Vapor pressure est.

    • hPa @ 20°C
    • hPa @ 25°C

    Evaporation rate
    Ultra slow

    Boiling point est.
    283°C

    Flash point

    • 147.42 ˚C est.

  • Synonyms

    • 9-Undecenoic acid
    • 9-hendecenoic acid
    • (E)-undec-9-enoic acid
    • 9-Undecenoic acid, (E)-
    • trans-9-undecenoic acid
    • trans-undec-9-enoic acid
    • (9E)-undec-9-enoic acid
    • 37973-84-5
    • 593-25-9
    • C11:1n-2
    • (E)-9-undecenoic acid
    • 9-Undecensaeure
    • Undec-9-ensaeure
    • Undecen-9-saeure
    • Undec-9t-ensaeure
    • acido 9-undecenoico
    • acide 9-undecenoique
    • undec-9t-enoic acid
    • 11:1, n-2 trans
    • C11:1, n-2 trans
    • trans-Delta(9)-Undecensaeure
    • SCHEMBL547950
    • trans-Delta(9)-Undecylensaeure
    • CHEBI:39452
    • CHEBI:39453
    • DTXSID301313510
    • LMFA01030035
    • C11:1, n-2
    • 11:1, n-2
    • Q27119872
    • 593-25-9

  • Applications

    9-Undecenoic acid (CAS 37973-84-5) is a long-chain unsaturated carboxylic acid used as a reactive intermediate for the synthesis of unsaturated esters and functionalized polymers. In industry, it serves as a building block for specialty resins in coatings and adhesives, often via esterification or derivatization of the carboxyl group. It also functions as a precursor for fragrance and cosmetic ingredients, enabling the preparation of fragrance esters and related actives. The carboxyl group and the terminal double bond provide handles for chemical modification, making it a convenient feedstock for surfactant and emulsifier derivatives used in household cleaning formulations. Additionally, it can be used to prepare resinous components for alkyd and UV-curable coating systems.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 1685.47
    methanol 1732.68
    isopropanol 1419.32
    water 0.06
    ethyl acetate 585.15
    n-propanol 1152.33
    acetone 1403.82
    n-butanol 1026.54
    acetonitrile 318.4
    DMF 1206.88
    toluene 177.34
    isobutanol 790.13
    1,4-dioxane 871.31
    methyl acetate 340.39
    THF 2154.9
    2-butanone 778.35
    n-pentanol 835.39
    sec-butanol 903.24
    n-hexane 360.69
    ethylene glycol 143.92
    NMP 702.62
    cyclohexane 143.13
    DMSO 2205.02
    n-butyl acetate 567.61
    n-octanol 246.88
    chloroform 540.22
    n-propyl acetate 503.18
    acetic acid 422.86
    dichloromethane 514.58
    cyclohexanone 929.06
    propylene glycol 358.9
    isopropyl acetate 469.25
    DMAc 652.76
    2-ethoxyethanol 795.43
    isopentanol 859.97
    n-heptane 75.98
    ethyl formate 233.62
    1,2-dichloroethane 527.24
    n-hexanol 779.13
    2-methoxyethanol 1208.25
    isobutyl acetate 346.26
    tetrachloromethane 97.95
    n-pentyl acetate 312.93
    transcutol 2250.71
    n-heptanol 278.67
    ethylbenzene 135.27
    MIBK 548.7
    2-propoxyethanol 912.35
    tert-butanol 1535.22
    MTBE 1019.22
    2-butoxyethanol 480.06
    propionic acid 402.53
    o-xylene 128.99
    formic acid 111.65
    diethyl ether 982.55
    m-xylene 173.18
    p-xylene 152.91
    chlorobenzene 184.74
    dimethyl carbonate 100.99
    n-octane 27.08
    formamide 170.21
    cyclopentanone 1078.85
    2-pentanone 908.1
    anisole 273.12
    cyclopentyl methyl ether 1011.7
    gamma-butyrolactone 826.32
    1-methoxy-2-propanol 1151.64
    pyridine 449.62
    3-pentanone 416.71
    furfural 460.52
    n-dodecane 16.63
    diethylene glycol 517.32
    diisopropyl ether 301.34
    tert-amyl alcohol 946.05
    acetylacetone 618.52
    n-hexadecane 19.09
    acetophenone 239.52
    methyl propionate 404.53
    isopentyl acetate 521.19
    trichloroethylene 635.05
    n-nonanol 212.33
    cyclohexanol 688.34
    benzyl alcohol 252.57
    2-ethylhexanol 399.03
    isooctanol 232.41
    dipropyl ether 483.64
    1,2-dichlorobenzene 173.31
    ethyl lactate 191.59
    propylene carbonate 360.37
    n-methylformamide 445.64
    2-pentanol 766.46
    n-pentane 142.94
    1-propoxy-2-propanol 731.72
    1-methoxy-2-propyl acetate 501.05
    2-(2-methoxypropoxy) propanol 386.39
    mesitylene 130.16
    ε-caprolactone 634.12
    p-cymene 86.38
    epichlorohydrin 921.7
    1,1,1-trichloroethane 383.28
    2-aminoethanol 520.88
    morpholine-4-carbaldehyde 645.88
    sulfolane 1094.87
    2,2,4-trimethylpentane 60.48
    2-methyltetrahydrofuran 1421.69
    n-hexyl acetate 432.24
    isooctane 61.12
    2-(2-butoxyethoxy)ethanol 629.47
    sec-butyl acetate 355.04
    tert-butyl acetate 579.29
    decalin 80.48
    glycerin 344.06
    diglyme 893.46
    acrylic acid 223.11
    isopropyl myristate 151.97
    n-butyric acid 756.76
    acetyl acetate 210.25
    di(2-ethylhexyl) phthalate 138.15
    ethyl propionate 363.3
    nitromethane 488.17
    1,2-diethoxyethane 693.3
    benzonitrile 233.67
    trioctyl phosphate 110.38
    1-bromopropane 460.96
    gamma-valerolactone 963.59
    n-decanol 152.16
    triethyl phosphate 128.18
    4-methyl-2-pentanol 407.26
    propionitrile 355.96
    vinylene carbonate 241.99
    1,1,2-trichlorotrifluoroethane 544.2
    DMS 193.79
    cumene 106.6
    2-octanol 190.25
    2-hexanone 667.1
    octyl acetate 188.12
    limonene 167.1
    1,2-dimethoxyethane 1060.81
    ethyl orthosilicate 142.37
    tributyl phosphate 137.32
    diacetone alcohol 695.67
    N,N-dimethylaniline 206.53
    acrylonitrile 304.06
    aniline 277.09
    1,3-propanediol 677.53
    bromobenzene 184.84
    dibromomethane 430.8
    1,1,2,2-tetrachloroethane 642.49
    2-methyl-cyclohexyl acetate 270.61
    tetrabutyl urea 181.3
    diisobutyl methanol 214.66
    2-phenylethanol 288.48
    styrene 161.3
    dioctyl adipate 216.44
    dimethyl sulfate 194.36
    ethyl butyrate 333.07
    methyl lactate 225.8
    butyl lactate 261.62
    diethyl carbonate 167.65
    propanediol butyl ether 495.56
    triethyl orthoformate 232.25
    p-tert-butyltoluene 93.46
    methyl 4-tert-butylbenzoate 235.56
    morpholine 1404.89
    tert-butylamine 956.68
    n-dodecanol 110.73
    dimethoxymethane 762.29
    ethylene carbonate 229.22
    cyrene 290.82
    2-ethoxyethyl acetate 362.77
    2-ethylhexyl acetate 380.78
    1,2,4-trichlorobenzene 197.4
    4-methylpyridine 472.91
    dibutyl ether 369.6
    2,6-dimethyl-4-heptanol 214.66
    DEF 679.64
    dimethyl isosorbide 556.8
    tetrachloroethylene 415.12
    eugenol 248.81
    triacetin 298.18
    span 80 376.34
    1,4-butanediol 289.85
    1,1-dichloroethane 514.1
    2-methyl-1-pentanol 625.49
    methyl formate 196.37
    2-methyl-1-butanol 719.27
    n-decane 33.02
    butyronitrile 553.53
    3,7-dimethyl-1-octanol 273.28
    1-chlorooctane 149.39
    1-chlorotetradecane 49.35
    n-nonane 35.85
    undecane 22.55
    tert-butylcyclohexane 87.71
    cyclooctane 49.59
    cyclopentanol 788.74
    tetrahydropyran 1392.36
    tert-amyl methyl ether 624.55
    2,5,8-trioxanonane 598.88
    1-hexene 831.36
    2-isopropoxyethanol 624.17
    2,2,2-trifluoroethanol 80.14
    methyl butyrate 508.09

    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