6-Hydroxyhexanoic Acid

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  • Identifiers

    CAS number
    1191-25-9

    Molecular formula
    C6H12O3

    SMILES
    C(CCC(=O)O)CCO

    Safety labels

    Flammable
    Flammable

    Corrosive
    Corrosive

    Irritant
    Irritant

  • Odor profile

    Fragrance
    Odorless 42.18%
    Fruity 31.77%
    Cheesy 30.19%
    Sour 29.5%
    Buttery 28.45%
    Sweet 25.8%
    Milky 24.63%
    Alcoholic 24.62%
    Oily 23.74%
    Fatty 21.89%

     

    Flavor
    Odorless 54.13%
    Sour 41.49%
    Rancid 37.57%
    Acidic 37.27%
    Sweat 36.71%
    Cheese 36.51%
    Pungent 33.12%
    Sweet 32.06%
    Fatty 26.84%
    Cheesy 25.92%

     

    Odor impact est.
    Low

  • Properties

    XLogP3-AA
    -0.4

    pKa est.
    7.42 (neutral)

    Molecular weight
    132.16 g/mol

    Vapor pressure est.

    • hPa @ 20°C
    • hPa @ 25°C

    Evaporation rate
    Ultra slow

    Boiling point est.
    290°C

    Flash point

    • 146.22 ˚C est.

  • Synonyms

    • 6-Hydroxyhexanoic acid
    • 1191-25-9
    • Hexanoic acid, 6-hydroxy-
    • epsilon-Hydroxycaproic acid
    • 3Y3OX37NM8
    • 5-hydroxypentanecarboxylic acid
    • CHEBI:17869
    • DTXSID00152316
    • RefChem:104785
    • DTXCID4074807
    • 6-HYDROXYCAPROIC ACID
    • MFCD00046560
    • 6-hydroxy caproic acid
    • 6-hydroxy-hexanoic acid
    • 5-carboxypentanol
    • UNII-3Y3OX37NM8
    • 6-hydroxy-caproic acid
    • 6-Hydroxyhexanoic acid #
    • Hexanoic acid,6-hydroxy-
    • 6-HYDROCAPROIC ACID
    • epsilon-hydroxyhexanoic acid
    • SCHEMBL28484
    • SCHEMBL95801
    • SCHEMBL338022
    • orb2942871
    • SCHEMBL2679149
    • SCHEMBL2907872
    • SCHEMBL6387092
    • SCHEMBL8015405
    • CHEMBL2006530
    • SCHEMBL10406103
    • SCHEMBL10606762
    • .EPSILON.-HYDROXYCAPROIC ACID
    • GEO-02681
    • LMFA01050015
    • NSC617319
    • AKOS006223967
    • FH30993
    • HY-W105750
    • NSC-617319
    • s10488
    • DS-13995
    • NCI60_005214
    • SY032043
    • DB-041444
    • CS-0158392
    • NS00015092
    • C06103
    • EN300-137305
    • F319036
    • Q27102678
    • 6-Hydroxyhexanoic acid, 95%, may cont. variable amounts of dimer
    • 28158-18-1
    • 1191-25-9

  • Applications

    6-Hydroxyhexanoic Acid (CAS 1191-25-9) is a bifunctional feedstock used primarily as a precursor to ε-caprolactone, which is polymerized to polycaprolactone (PCL), a biodegradable polyester used in packaging, biomedical materials, and coatings. It also serves as a building block for polyesters and polyurethanes in industrial formulations, where it can act as a hydroxycarboxylic monomer or be converted to specialty esters for paints and inks, and as an intermediate or additive in polymer systems to tailor properties.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 173.64
    methanol 748.41
    isopropanol 41.57
    water 518.81
    ethyl acetate 9.67
    n-propanol 94.33
    acetone 43.82
    n-butanol 54.64
    acetonitrile 7.27
    DMF 364.59
    toluene 2.27
    isobutanol 58.6
    1,4-dioxane 29.35
    methyl acetate 10.54
    THF 91.77
    2-butanone 18.31
    n-pentanol 34.76
    sec-butanol 36.82
    n-hexane 2.42
    ethylene glycol 624.33
    NMP 455.84
    cyclohexane 2.03
    DMSO 1037.15
    n-butyl acetate 23.59
    n-octanol 20.67
    chloroform 4.58
    n-propyl acetate 13.56
    acetic acid 372.58
    dichloromethane 5.75
    cyclohexanone 67.4
    propylene glycol 389.85
    isopropyl acetate 10.03
    DMAc 204.18
    2-ethoxyethanol 142.78
    isopentanol 57.45
    n-heptane 2.26
    ethyl formate 40.48
    1,2-dichloroethane 8.63
    n-hexanol 54.55
    2-methoxyethanol 404.61
    isobutyl acetate 8.93
    tetrachloromethane 5.57
    n-pentyl acetate 14.6
    transcutol 269.87
    n-heptanol 26.13
    ethylbenzene 3.31
    MIBK 22.03
    2-propoxyethanol 140.0
    tert-butanol 127.54
    MTBE 14.83
    2-butoxyethanol 72.07
    propionic acid 214.37
    o-xylene 5.8
    formic acid 835.75
    diethyl ether 4.28
    m-xylene 4.9
    p-xylene 4.37
    chlorobenzene 4.28
    dimethyl carbonate 17.89
    n-octane 0.83
    formamide 633.0
    cyclopentanone 111.64
    2-pentanone 18.42
    anisole 13.27
    cyclopentyl methyl ether 31.62
    gamma-butyrolactone 175.09
    1-methoxy-2-propanol 164.72
    pyridine 14.81
    3-pentanone 11.68
    furfural 166.17
    n-dodecane 0.7
    diethylene glycol 257.02
    diisopropyl ether 4.18
    tert-amyl alcohol 93.65
    acetylacetone 45.91
    n-hexadecane 0.74
    acetophenone 24.64
    methyl propionate 17.65
    isopentyl acetate 23.91
    trichloroethylene 14.58
    n-nonanol 17.77
    cyclohexanol 55.7
    benzyl alcohol 31.5
    2-ethylhexanol 27.88
    isooctanol 21.51
    dipropyl ether 10.31
    1,2-dichlorobenzene 8.71
    ethyl lactate 37.32
    propylene carbonate 78.0
    n-methylformamide 305.61
    2-pentanol 20.39
    n-pentane 1.17
    1-propoxy-2-propanol 82.33
    1-methoxy-2-propyl acetate 37.57
    2-(2-methoxypropoxy) propanol 88.93
    mesitylene 5.67
    ε-caprolactone 73.48
    p-cymene 6.6
    epichlorohydrin 59.53
    1,1,1-trichloroethane 5.8
    2-aminoethanol 614.38
    morpholine-4-carbaldehyde 256.12
    sulfolane 439.67
    2,2,4-trimethylpentane 2.21
    2-methyltetrahydrofuran 43.23
    n-hexyl acetate 23.45
    isooctane 1.72
    2-(2-butoxyethoxy)ethanol 117.5
    sec-butyl acetate 8.5
    tert-butyl acetate 24.05
    decalin 2.2
    glycerin 665.74
    diglyme 147.47
    acrylic acid 262.73
    isopropyl myristate 8.97
    n-butyric acid 124.79
    acetyl acetate 13.87
    di(2-ethylhexyl) phthalate 25.87
    ethyl propionate 12.83
    nitromethane 200.87
    1,2-diethoxyethane 17.9
    benzonitrile 14.24
    trioctyl phosphate 18.73
    1-bromopropane 2.52
    gamma-valerolactone 195.46
    n-decanol 13.09
    triethyl phosphate 17.3
    4-methyl-2-pentanol 24.12
    propionitrile 9.46
    vinylene carbonate 58.32
    1,1,2-trichlorotrifluoroethane 194.76
    DMS 23.99
    cumene 4.92
    2-octanol 12.56
    2-hexanone 16.78
    octyl acetate 14.09
    limonene 9.93
    1,2-dimethoxyethane 94.48
    ethyl orthosilicate 15.01
    tributyl phosphate 21.43
    diacetone alcohol 99.87
    N,N-dimethylaniline 17.97
    acrylonitrile 21.12
    aniline 15.24
    1,3-propanediol 389.56
    bromobenzene 2.85
    dibromomethane 4.29
    1,1,2,2-tetrachloroethane 17.42
    2-methyl-cyclohexyl acetate 24.14
    tetrabutyl urea 32.13
    diisobutyl methanol 16.61
    2-phenylethanol 31.14
    styrene 3.08
    dioctyl adipate 22.57
    dimethyl sulfate 74.49
    ethyl butyrate 17.94
    methyl lactate 79.91
    butyl lactate 43.91
    diethyl carbonate 13.53
    propanediol butyl ether 120.77
    triethyl orthoformate 15.98
    p-tert-butyltoluene 6.85
    methyl 4-tert-butylbenzoate 45.58
    morpholine 57.41
    tert-butylamine 45.31
    n-dodecanol 9.5
    dimethoxymethane 62.36
    ethylene carbonate 42.2
    cyrene 107.2
    2-ethoxyethyl acetate 25.29
    2-ethylhexyl acetate 15.99
    1,2,4-trichlorobenzene 12.14
    4-methylpyridine 12.97
    dibutyl ether 6.37
    2,6-dimethyl-4-heptanol 16.61
    DEF 53.05
    dimethyl isosorbide 111.79
    tetrachloroethylene 23.64
    eugenol 55.9
    triacetin 35.94
    span 80 80.86
    1,4-butanediol 155.92
    1,1-dichloroethane 2.67
    2-methyl-1-pentanol 43.46
    methyl formate 166.03
    2-methyl-1-butanol 57.71
    n-decane 1.01
    butyronitrile 9.17
    3,7-dimethyl-1-octanol 23.46
    1-chlorooctane 3.88
    1-chlorotetradecane 1.89
    n-nonane 0.93
    undecane 0.83
    tert-butylcyclohexane 2.49
    cyclooctane 1.08
    cyclopentanol 106.86
    tetrahydropyran 13.79
    tert-amyl methyl ether 17.01
    2,5,8-trioxanonane 122.96
    1-hexene 3.82
    2-isopropoxyethanol 68.64
    2,2,2-trifluoroethanol 156.85
    methyl butyrate 23.73

    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