Octadecenoic Acid

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  • Identifiers

    CAS number
    26764-26-1

    Molecular formula
    C18H34O2

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

    Safety labels

  • Odor profile

    Fragrance
    Fatty 84.27%
    Waxy 66.72%
    Oily 50.56%
    Dairy 35.3%
    Milky 30.32%
    Creamy 28.3%
    Meaty 27.6%
    Citrus 25.91%
    Savory 23.72%
    Soapy 22.32%

     

    Flavor
    Fatty 55.57%
    Waxy 54.05%
    Fat 35.66%
    Mild 32.44%
    Oily 30.37%
    Faint 28.24%
    Soapy 26.74%
    Coconut 26.61%
    Sweet 26.19%
    Creamy 25.48%

     

    Odor impact est.
    Low

  • Properties

    XLogP3-AA
    8.1

    pKa est.
    7.11 (neutral)

    Molecular weight
    282.5 g/mol

    Vapor pressure est.

    • hPa @ 20°C
    • hPa @ 25°C

    Evaporation rate
    Ultra slow

    Boiling point est.
    372°C

    Flash point

    • 194.61 ˚C est.

  • Synonyms

    • (E)-octadec-2-enoic acid
    • OCTADECENOIC ACID
    • 26764-26-1
    • fatty acid 18:1
    • RefChem:855766
    • CHEBI:25634
    • DTXSID80865316
    • DTXCID401774868
    • 247-991-8
    • trans-2-octadecenoic acid
    • 2825-79-8
    • (E)-2-octadecenoic acid
    • trans-2-oleic acid
    • octadec-2-enoic acid
    • 2-Octadecenoic acid
    • trans-octadec-2-enoic acid
    • 27251-59-8
    • CHEMBL4292703
    • 2Z-octadecenoic acid
    • C18:1n-16
    • trans-2-Octadecenoicacid
    • NSC931
    • Octadecenoic acid, (E)-
    • (2E)-octadec-2-enoic acid
    • 2-Octadecensaeure
    • 2-octadecenic acid
    • Octadec-2-ensaeure
    • Octadec-2t-ensaeure
    • octadec-2t-enoic acid
    • starbld0007012
    • 2-trans-octadecenoic acid
    • SCHEMBL41749
    • orb2943909
    • SCHEMBL6422860
    • 18:1 (n-16), trans
    • C18:1 (n-16), trans
    • CHEBI:50572
    • CHEBI:50573
    • LKOVPWSSZFDYPG-WUKNDPDISA-N
    • trans-Heptadecen-(1)-carbonsaeure
    • BDBM50466179
    • LMFA01030062
    • HY-W749928
    • C18:1, n-16
    • G66943
    • Q27122121
    • Q27122122
    • 26764-26-1

  • Applications

    Octadecenoic Acid (CAS 26764-26-1) is a fatty acid in the oleochemical family and is commonly used as a versatile industrial feedstock. It is typically converted to fatty acid esters and glycerides used as lubricants and plasticizers for polymers, as surfactants and emulsifiers in cleaners and personal care formulations, and as a precursor for specialty esters and stabilizers in coatings and inks. It also serves as an emollient or basic ingredient in cosmetics and personal care formulations, and as an oleochemical feedstock for polymer processing to tune resin properties and performance.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 67.65
    methanol 48.19
    isopropanol 88.25
    water 0.01
    ethyl acetate 121.18
    n-propanol 77.01
    acetone 86.4
    n-butanol 86.61
    acetonitrile 22.42
    DMF 195.93
    toluene 49.67
    isobutanol 73.04
    1,4-dioxane 128.72
    methyl acetate 68.96
    THF 591.11
    2-butanone 130.07
    n-pentanol 77.3
    sec-butanol 86.92
    n-hexane 36.9
    ethylene glycol 2.72
    NMP 412.44
    cyclohexane 79.09
    DMSO 316.28
    n-butyl acetate 217.93
    n-octanol 65.47
    chloroform 232.35
    n-propyl acetate 184.34
    acetic acid 35.21
    dichloromethane 243.23
    cyclohexanone 375.07
    propylene glycol 14.35
    isopropyl acetate 149.36
    DMAc 302.42
    2-ethoxyethanol 120.7
    isopentanol 116.63
    n-heptane 31.96
    ethyl formate 50.35
    1,2-dichloroethane 236.88
    n-hexanol 85.5
    2-methoxyethanol 125.91
    isobutyl acetate 147.89
    tetrachloromethane 67.96
    n-pentyl acetate 237.83
    transcutol 553.15
    n-heptanol 67.64
    ethylbenzene 51.83
    MIBK 185.13
    2-propoxyethanol 159.08
    tert-butanol 146.83
    MTBE 190.79
    2-butoxyethanol 158.82
    propionic acid 49.69
    o-xylene 53.16
    formic acid 6.7
    diethyl ether 124.72
    m-xylene 55.81
    p-xylene 69.2
    chlorobenzene 81.8
    dimethyl carbonate 28.09
    n-octane 14.86
    formamide 14.89
    cyclopentanone 412.46
    2-pentanone 166.67
    anisole 105.78
    cyclopentyl methyl ether 293.97
    gamma-butyrolactone 308.25
    1-methoxy-2-propanol 165.33
    pyridine 132.41
    3-pentanone 115.71
    furfural 199.07
    n-dodecane 8.28
    diethylene glycol 48.83
    diisopropyl ether 79.04
    tert-amyl alcohol 143.27
    acetylacetone 178.78
    n-hexadecane 10.02
    acetophenone 137.21
    methyl propionate 93.7
    isopentyl acetate 239.85
    trichloroethylene 321.9
    n-nonanol 68.14
    cyclohexanol 138.22
    benzyl alcohol 66.18
    2-ethylhexanol 86.31
    isooctanol 80.46
    dipropyl ether 179.21
    1,2-dichlorobenzene 113.32
    ethyl lactate 69.18
    propylene carbonate 173.0
    n-methylformamide 47.7
    2-pentanol 85.8
    n-pentane 22.53
    1-propoxy-2-propanol 193.46
    1-methoxy-2-propyl acetate 204.3
    2-(2-methoxypropoxy) propanol 142.9
    mesitylene 52.52
    ε-caprolactone 304.48
    p-cymene 51.68
    epichlorohydrin 363.72
    1,1,1-trichloroethane 223.76
    2-aminoethanol 18.13
    morpholine-4-carbaldehyde 256.01
    sulfolane 674.27
    2,2,4-trimethylpentane 22.61
    2-methyltetrahydrofuran 378.42
    n-hexyl acetate 224.92
    isooctane 17.58
    2-(2-butoxyethoxy)ethanol 196.33
    sec-butyl acetate 163.52
    tert-butyl acetate 240.58
    decalin 38.34
    glycerin 21.01
    diglyme 392.15
    acrylic acid 26.28
    isopropyl myristate 92.61
    n-butyric acid 133.73
    acetyl acetate 64.74
    di(2-ethylhexyl) phthalate 62.19
    ethyl propionate 139.28
    nitromethane 74.53
    1,2-diethoxyethane 262.75
    benzonitrile 73.07
    trioctyl phosphate 53.59
    1-bromopropane 167.91
    gamma-valerolactone 443.31
    n-decanol 47.36
    triethyl phosphate 96.04
    4-methyl-2-pentanol 73.7
    propionitrile 41.53
    vinylene carbonate 102.22
    1,1,2-trichlorotrifluoroethane 207.92
    DMS 94.04
    cumene 48.86
    2-octanol 64.65
    2-hexanone 187.12
    octyl acetate 102.09
    limonene 99.43
    1,2-dimethoxyethane 274.32
    ethyl orthosilicate 101.18
    tributyl phosphate 72.09
    diacetone alcohol 228.02
    N,N-dimethylaniline 97.18
    acrylonitrile 36.98
    aniline 57.43
    1,3-propanediol 44.98
    bromobenzene 97.68
    dibromomethane 184.37
    1,1,2,2-tetrachloroethane 381.34
    2-methyl-cyclohexyl acetate 189.29
    tetrabutyl urea 113.12
    diisobutyl methanol 76.24
    2-phenylethanol 77.46
    styrene 55.29
    dioctyl adipate 133.19
    dimethyl sulfate 79.44
    ethyl butyrate 193.09
    methyl lactate 49.49
    butyl lactate 147.04
    diethyl carbonate 91.34
    propanediol butyl ether 120.01
    triethyl orthoformate 159.89
    p-tert-butyltoluene 54.36
    methyl 4-tert-butylbenzoate 163.0
    morpholine 235.15
    tert-butylamine 111.74
    n-dodecanol 33.92
    dimethoxymethane 127.04
    ethylene carbonate 98.6
    cyrene 147.04
    2-ethoxyethyl acetate 202.99
    2-ethylhexyl acetate 200.46
    1,2,4-trichlorobenzene 135.73
    4-methylpyridine 147.42
    dibutyl ether 175.79
    2,6-dimethyl-4-heptanol 76.24
    DEF 204.25
    dimethyl isosorbide 337.91
    tetrachloroethylene 212.52
    eugenol 126.46
    triacetin 192.13
    span 80 138.23
    1,4-butanediol 17.7
    1,1-dichloroethane 173.71
    2-methyl-1-pentanol 94.38
    methyl formate 27.31
    2-methyl-1-butanol 94.17
    n-decane 18.46
    butyronitrile 71.83
    3,7-dimethyl-1-octanol 86.23
    1-chlorooctane 82.61
    1-chlorotetradecane 26.75
    n-nonane 18.54
    undecane 11.61
    tert-butylcyclohexane 34.38
    cyclooctane 24.3
    cyclopentanol 142.79
    tetrahydropyran 279.55
    tert-amyl methyl ether 170.47
    2,5,8-trioxanonane 234.03
    1-hexene 86.52
    2-isopropoxyethanol 121.88
    2,2,2-trifluoroethanol 14.34
    methyl butyrate 201.0

    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