4-Hydroxy-6-methyl-2-pyrone

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  • Identifiers

    CAS number
    675-10-5

    Molecular formula
    C6H6O3

    SMILES
    CC1=CC(=CC(=O)O1)O

    Safety labels

    Irritant
    Irritant

  • Odor profile

    Fragrance
    Sweet 40.67%
    Caramellic 36.65%
    Odorless 35.33%
    Nutty 33.86%
    Burnt 31.95%
    Creamy 31.2%
    Phenolic 28.88%
    Coconut 26.73%
    Fruity 23.33%
    Milky 22.94%

     

    Flavor
    Nutty 35.45%
    Phenolic 33.91%
    Sweet 33.78%
    Musty 32.19%
    Almond 30.71%
    Creamy 29.6%
    Bitter 28.37%
    Caramel 25.37%
    Woody 25.12%
    Mild 23.75%

     

    Odor impact est.
    High

  • Properties

    XLogP3-AA
    0.5

    pKa est.
    7.81 (neutral)

    Molecular weight
    126.11 g/mol

    Vapor pressure est.

    • hPa @ 20°C
    • hPa @ 25°C

    Evaporation rate
    Ultra slow

    Boiling point est.
    290°C

    Flash point

    • 105.79 ˚C est.

  • Synonyms

    • 4-Hydroxy-6-methyl-2-pyrone
    • 675-10-5
    • 4-Hydroxy-6-methyl-2H-pyran-2-one
    • 4-hydroxy-6-methylpyran-2-one
    • Triacetic acid lactone
    • Triacetate lactone
    • 2H-PYRAN-2-ONE, 4-HYDROXY-6-METHYL-
    • S1S883S4EE
    • NSC-34625
    • DTXSID1060974
    • CHEBI:16458
    • RefChem:523908
    • DTXCID7044895
    • 211-619-2
    • 2-Hydroxy-6-methyl-4H-pyran-4-one
    • 70254-61-4
    • MFCD00006641
    • MFCD18820248
    • 6-Methyl-4-hydroxypyron-(2)
    • CHEMBL54907
    • 6-Methyl-4-hydroxypyran-2-one
    • 4-hydroxy-6-methyl-pyran-2-one
    • 6-methyl-4-oxidanyl-pyran-2-one
    • 3,5-Dihydroxysorbic acid delta-lactone
    • 6-methyl-4-hydroxy-2-pyrone
    • CCRIS 3600
    • 4-Hydroxy-6-methylpyran-4-one
    • EINECS 211-619-2
    • NSC 34625
    • BRN 0113815
    • UNII-S1S883S4EE
    • 2-hydroxy-6-methyl-pyran-4-one
    • 4H-Pyran-4-one, 2-hydroxy-6-methyl-
    • Spectrum_001904
    • SpecPlus_000816
    • Spectrum2_001978
    • Spectrum3_001720
    • Spectrum4_001907
    • Spectrum5_000594
    • 4-hydroxy-6-methylpyrone
    • 6-methyl-4-hydroxypyrone
    • 4-hydroxy-6-methyl-pyrone
    • 4-hydroxy-6-methylpyranone
    • 4-hydroxy-6-methyl pyranone
    • BSPBio_003340
    • KBioGR_002500
    • KBioSS_002438
    • 4-hydoxy-6-methyl-2-pyrone
    • DivK1c_006912
    • SCHEMBL320025
    • SCHEMBL918518
    • SPECTRUM1600759
    • SPBio_002135
    • 4- hydoxy-6-methyl-2-pyrone
    • orb3029312
    • SCHEMBL6415526
    • 4-hydroxy- 6-methyl-2-pyrone
    • 4-hydroxy-6 -methyl-2-pyrone
    • 4-hydroxy-6-methyl pyr-2-one
    • SCHEMBL28274573
    • KBio1_001856
    • KBio2_002432
    • KBio2_005000
    • KBio2_007568
    • KBio3_002560
    • 6-methyl-4-hydroxy pyran-2-one
    • Hydroxy-6-methyl-2-pyrone, 4-
    • 3,5-Dihydroxysorbic acid d-lactone
    • ALBB-021321
    • BB_NC-02010
    • HY-Y1634
    • NSC34625
    • 3,5-Dihydroxysorbic acid #-lactone
    • BBL008420
    • BDBM50405204
    • CCG-39516
    • EBC-47560
    • SBB001910
    • STK772128
    • 4-Hydroxy-6-methyl-2-pyrone, 98%
    • AKOS000119605
    • AKOS016007260
    • CS-W020045
    • SDCCGMLS-0066925.P001
    • NCGC00095976-01
    • NCGC00095976-02
    • NCGC00178130-01
    • AC-27196
    • DA-17115
    • FH129488
    • FH141377
    • PD000450
    • SY001948
    • SY105730
    • 4-HYDROXY-6-METHYL-.ALPHA.-PYRONE
    • DB-055039
    • ST4083834
    • CS-0061284
    • H0715
    • NS00015328
    • EN300-20217
    • 75H105
    • 7H-939
    • C02752
    • F14831
    • O10801
    • F003638
    • SR-05000002374
    • Q7839869
    • SR-05000002374-1
    • BRD-K77202630-001-02-9
    • BRD-K77202630-001-03-7
    • SORBIC ACID, 3,5-DIHYDROXY-, .DELTA.-LACTONE
    • F0001-1779
    • Z104477314
    • InChI=1/C6H6O3/c1-4-2-5(7)3-6(8)9-4/h2-3,7H,1H
    • KJ6
    • 675-10-5

  • Applications

    4-Hydroxy-6-methyl-2-pyrone (CAS 675-10-5) is primarily used as an organic-synthesis intermediate and as a fragrance/aroma precursor in perfumery and flavor formulations; it may contribute fruity-to-caramel notes in cosmetics and personal care products; it serves as a building block for the synthesis of pyrone- and lactone-containing compounds in pharmaceutical development; in industrial chemistry it can be used to prepare more complex lactones and heterocycles; overall use is typically as an intermediate or fragrance-related chemical, and its use is subject to local regulations and formulation limits.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 142.49
    methanol 171.37
    isopropanol 118.36
    water 21.08
    ethyl acetate 148.08
    n-propanol 100.59
    acetone 331.6
    n-butanol 82.77
    acetonitrile 219.7
    DMF 623.26
    toluene 10.67
    isobutanol 71.23
    1,4-dioxane 252.1
    methyl acetate 162.73
    THF 564.22
    2-butanone 136.74
    n-pentanol 64.26
    sec-butanol 75.13
    n-hexane 4.23
    ethylene glycol 118.73
    NMP 367.33
    cyclohexane 1.69
    DMSO 644.74
    n-butyl acetate 49.59
    n-octanol 44.46
    chloroform 22.69
    n-propyl acetate 84.69
    acetic acid 284.48
    dichloromethane 30.58
    cyclohexanone 99.34
    propylene glycol 121.48
    isopropyl acetate 90.76
    DMAc 356.04
    2-ethoxyethanol 211.27
    isopentanol 74.01
    n-heptane 3.98
    ethyl formate 126.56
    1,2-dichloroethane 32.11
    n-hexanol 50.56
    2-methoxyethanol 424.32
    isobutyl acetate 49.67
    tetrachloromethane 4.65
    n-pentyl acetate 41.52
    transcutol 415.44
    n-heptanol 27.23
    ethylbenzene 6.67
    MIBK 96.0
    2-propoxyethanol 188.08
    tert-butanol 167.51
    MTBE 78.6
    2-butoxyethanol 81.68
    propionic acid 137.45
    o-xylene 10.45
    formic acid 174.83
    diethyl ether 92.82
    m-xylene 14.08
    p-xylene 8.77
    chlorobenzene 14.21
    dimethyl carbonate 131.68
    n-octane 1.98
    formamide 241.68
    cyclopentanone 234.18
    2-pentanone 142.77
    anisole 52.51
    cyclopentyl methyl ether 129.7
    gamma-butyrolactone 370.63
    1-methoxy-2-propanol 359.62
    pyridine 54.4
    3-pentanone 76.15
    furfural 212.54
    n-dodecane 3.25
    diethylene glycol 235.69
    diisopropyl ether 30.45
    tert-amyl alcohol 86.93
    acetylacetone 231.78
    n-hexadecane 3.56
    acetophenone 48.84
    methyl propionate 139.54
    isopentyl acetate 45.73
    trichloroethylene 44.66
    n-nonanol 41.65
    cyclohexanol 50.1
    benzyl alcohol 44.49
    2-ethylhexanol 29.17
    isooctanol 24.91
    dipropyl ether 46.15
    1,2-dichlorobenzene 16.33
    ethyl lactate 78.36
    propylene carbonate 160.75
    n-methylformamide 272.57
    2-pentanol 61.19
    n-pentane 3.93
    1-propoxy-2-propanol 119.25
    1-methoxy-2-propyl acetate 102.98
    2-(2-methoxypropoxy) propanol 133.95
    mesitylene 11.27
    ε-caprolactone 113.59
    p-cymene 10.68
    epichlorohydrin 266.69
    1,1,1-trichloroethane 31.36
    2-aminoethanol 135.35
    morpholine-4-carbaldehyde 373.88
    sulfolane 381.22
    2,2,4-trimethylpentane 3.58
    2-methyltetrahydrofuran 197.03
    n-hexyl acetate 76.45
    isooctane 4.07
    2-(2-butoxyethoxy)ethanol 175.54
    sec-butyl acetate 53.38
    tert-butyl acetate 113.42
    decalin 2.92
    glycerin 221.89
    diglyme 246.56
    acrylic acid 147.97
    isopropyl myristate 36.53
    n-butyric acid 136.4
    acetyl acetate 112.02
    di(2-ethylhexyl) phthalate 37.41
    ethyl propionate 89.37
    nitromethane 598.84
    1,2-diethoxyethane 85.12
    benzonitrile 42.31
    trioctyl phosphate 30.31
    1-bromopropane 18.82
    gamma-valerolactone 332.57
    n-decanol 33.54
    triethyl phosphate 36.33
    4-methyl-2-pentanol 45.57
    propionitrile 90.85
    vinylene carbonate 120.93
    1,1,2-trichlorotrifluoroethane 145.6
    DMS 79.17
    cumene 8.59
    2-octanol 23.37
    2-hexanone 81.31
    octyl acetate 48.73
    limonene 14.82
    1,2-dimethoxyethane 291.81
    ethyl orthosilicate 33.32
    tributyl phosphate 38.91
    diacetone alcohol 185.91
    N,N-dimethylaniline 39.06
    acrylonitrile 117.47
    aniline 33.7
    1,3-propanediol 175.16
    bromobenzene 9.11
    dibromomethane 16.75
    1,1,2,2-tetrachloroethane 36.63
    2-methyl-cyclohexyl acetate 41.65
    tetrabutyl urea 52.62
    diisobutyl methanol 24.32
    2-phenylethanol 41.93
    styrene 7.44
    dioctyl adipate 58.13
    dimethyl sulfate 213.49
    ethyl butyrate 52.64
    methyl lactate 148.23
    butyl lactate 49.19
    diethyl carbonate 40.95
    propanediol butyl ether 114.62
    triethyl orthoformate 43.47
    p-tert-butyltoluene 12.0
    methyl 4-tert-butylbenzoate 80.77
    morpholine 263.91
    tert-butylamine 65.13
    n-dodecanol 26.93
    dimethoxymethane 372.87
    ethylene carbonate 103.09
    cyrene 130.84
    2-ethoxyethyl acetate 74.66
    2-ethylhexyl acetate 31.76
    1,2,4-trichlorobenzene 22.99
    4-methylpyridine 60.2
    dibutyl ether 42.12
    2,6-dimethyl-4-heptanol 24.32
    DEF 141.34
    dimethyl isosorbide 208.71
    tetrachloroethylene 19.02
    eugenol 81.55
    triacetin 98.28
    span 80 93.9
    1,4-butanediol 71.71
    1,1-dichloroethane 33.48
    2-methyl-1-pentanol 53.22
    methyl formate 249.92
    2-methyl-1-butanol 60.95
    n-decane 4.45
    butyronitrile 85.37
    3,7-dimethyl-1-octanol 43.22
    1-chlorooctane 17.69
    1-chlorotetradecane 10.23
    n-nonane 3.87
    undecane 3.81
    tert-butylcyclohexane 4.48
    cyclooctane 1.23
    cyclopentanol 98.23
    tetrahydropyran 112.6
    tert-amyl methyl ether 61.91
    2,5,8-trioxanonane 226.03
    1-hexene 13.82
    2-isopropoxyethanol 128.11
    2,2,2-trifluoroethanol 138.65
    methyl butyrate 101.03

    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