2-Methyl-1-butene

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  • Identifiers

    CAS number
    563-46-2

    Molecular formula
    C5H10

    SMILES
    CCC(=C)C

    Safety labels

    Flammable
    Flammable

    Irritant
    Irritant

    Health Hazard
    Health

    Environmental Hazard
    Environmental

  • Odor profile

    Fragrance
    Gassy 47.89%
    Ethereal 37.76%
    Herbal 36.1%
    Fresh 35.63%
    Camphoreous 34.56%
    Mint 30.6%
    Pungent 28.93%
    Citrus 25.42%
    Terpenic 24.22%
    Sharp 23.32%

     

    Flavor
    Citrus 40.24%
    Green 37.82%
    Fruity 36.24%
    Woody 35.67%
    Gasoline 27.32%
    Nutty 26.58%
    Earthy 26.52%
    Spicy 26.49%
    Ethereal 26.34%
    Herbal 26.17%

     

    Odor impact est.
    High

  • Properties

    XLogP3-AA
    2.5

    pKa est.
    10.34 (weak base)

    Molecular weight
    70.13 g/mol

    Vapor pressure est.

    • hPa @ 20°C
    • hPa @ 25°C

    Evaporation rate
    Ultra fast

    Melting point expt.

    • -137.5 °C

    Boiling point

    • 31.2 °C

    Flash point

    • -48.57 ˚C est.
    • less than 20 °F (NFPA, 2010)
    • Flash point < -7 °C
    • BELOW -20 °F (BELOW -7 °C) (CLOSED CUP)

    Solubility expt.

    • Sol in alcohol, ether, benzene
    • In water, 130 mg/l @ 20 °C.

  • Synonyms

    • 2-METHYL-1-BUTENE
    • 2-Methylbut-1-ene
    • 563-46-2
    • 2-Methylbutene
    • 1-Isoamylene
    • 1-Butene, 2-methyl-
    • 2-Methylbutene-1
    • Butene, 2-methyl-
    • gamma-Isoamylene
    • .gamma.-Isoamylene
    • 26760-64-5
    • UNII-33C9Y0I55H
    • 2-methyl-1-butylene
    • HSDB 5695
    • 33C9Y0I55H
    • EINECS 209-250-7
    • MFCD00009333
    • NSC 72414
    • NSC-72414
    • UN2459
    • 1-BUTENE,2-METHYL
    • C2H5C(CH3)=CH2
    • DTXSID3052224
    • CHEBI:77915
    • 2-METHYLBUT-1-ENE [HSDB]
    • 60288-48-4
    • UN 2459
    • 26969-60-8
    • UNII-F238I92ISV
    • gammaIsoamylene
    • Isopentenes
    • 1Isoamylene
    • 2Methylbut1ene
    • 2-methyl butene
    • 2-methyl-butene
    • 2 -methyl butene
    • 1Butene, 2methyl
    • EINECS 247-975-0
    • 3-methyl-3-butene
    • METHYLBUTENES
    • EC 247-975-0
    • 2-Methyl-1-butene [UN2459] [Flammable liquid]
    • 2-Methyl-1-butene, 98%
    • 2-Methyl-1-butene, technical
    • F238I92ISV
    • DTXCID9020249
    • DTXSID50209041
    • NSC72414
    • UN2371
    • AKOS009157996
    • 2-Methyl-1-butene, analytical standard
    • DB-052896
    • DB-303595
    • Isopentenes [UN2371] [Flammable liquid]
    • M0174
    • NS00003710
    • D91286
    • Q27147526

  • Applications

    2-Methyl-1-butene (CAS 563-46-2) is an alpha-olefin used as a reactive monomer and feedstock in polyolefin production to tailor branching and processing properties; it may undergo hydroformylation (oxo process) to give longer-chain aldehydes and alcohols that serve as lubricants, surfactants, and other specialty intermediates; it can be used as a reactive diluent or monomer in coatings and inks to modify performance; it acts as a solvent or processing aid in industrial formulations; and it provides a route to branched building blocks for adhesives and cleaners, subject to regulatory limits.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 392.9
    methanol 272.56
    isopropanol 327.74
    water 0.63
    ethyl acetate 459.44
    n-propanol 384.0
    acetone 189.34
    n-butanol 467.7
    acetonitrile 228.0
    DMF 167.2
    toluene 220.93
    isobutanol 250.41
    1,4-dioxane 497.27
    methyl acetate 276.58
    THF 641.21
    2-butanone 315.02
    n-pentanol 308.3
    sec-butanol 429.39
    n-hexane 331.41
    ethylene glycol 51.94
    NMP 197.08
    cyclohexane 235.61
    DMSO 140.27
    n-butyl acetate 639.64
    n-octanol 284.05
    chloroform 751.57
    n-propyl acetate 222.83
    acetic acid 181.65
    dichloromethane 461.3
    cyclohexanone 313.42
    propylene glycol 124.93
    isopropyl acetate 289.14
    DMAc 232.38
    2-ethoxyethanol 251.1
    isopentanol 359.16
    n-heptane 478.46
    ethyl formate 139.63
    1,2-dichloroethane 256.47
    n-hexanol 711.33
    2-methoxyethanol 323.46
    isobutyl acetate 149.94
    tetrachloromethane 220.88
    n-pentyl acetate 249.33
    transcutol 941.95
    n-heptanol 296.67
    ethylbenzene 138.1
    MIBK 211.61
    2-propoxyethanol 598.18
    tert-butanol 412.7
    MTBE 495.22
    2-butoxyethanol 312.77
    propionic acid 227.41
    o-xylene 148.84
    formic acid 43.5
    diethyl ether 610.16
    m-xylene 157.2
    p-xylene 139.95
    chlorobenzene 204.28
    dimethyl carbonate 65.32
    n-octane 124.38
    formamide 57.3
    cyclopentanone 304.02
    2-pentanone 320.73
    anisole 217.51
    cyclopentyl methyl ether 391.8
    gamma-butyrolactone 247.35
    1-methoxy-2-propanol 336.35
    pyridine 369.93
    3-pentanone 278.74
    furfural 225.06
    n-dodecane 70.1
    diethylene glycol 254.18
    diisopropyl ether 241.61
    tert-amyl alcohol 496.77
    acetylacetone 224.81
    n-hexadecane 73.55
    acetophenone 152.04
    methyl propionate 250.62
    isopentyl acetate 421.78
    trichloroethylene 405.54
    n-nonanol 270.36
    cyclohexanol 316.71
    benzyl alcohol 149.19
    2-ethylhexanol 521.03
    isooctanol 227.49
    dipropyl ether 730.37
    1,2-dichlorobenzene 163.27
    ethyl lactate 104.62
    propylene carbonate 180.97
    n-methylformamide 102.52
    2-pentanol 404.44
    n-pentane 284.05
    1-propoxy-2-propanol 650.15
    1-methoxy-2-propyl acetate 401.43
    2-(2-methoxypropoxy) propanol 319.71
    mesitylene 99.77
    ε-caprolactone 320.03
    p-cymene 167.0
    epichlorohydrin 322.23
    1,1,1-trichloroethane 377.54
    2-aminoethanol 144.68
    morpholine-4-carbaldehyde 271.01
    sulfolane 198.9
    2,2,4-trimethylpentane 113.23
    2-methyltetrahydrofuran 608.26
    n-hexyl acetate 332.65
    isooctane 82.07
    2-(2-butoxyethoxy)ethanol 420.08
    sec-butyl acetate 202.06
    tert-butyl acetate 302.79
    decalin 102.63
    glycerin 117.43
    diglyme 546.82
    acrylic acid 145.49
    isopropyl myristate 170.9
    n-butyric acid 393.51
    acetyl acetate 217.41
    di(2-ethylhexyl) phthalate 120.42
    ethyl propionate 239.53
    nitromethane 172.37
    1,2-diethoxyethane 555.58
    benzonitrile 181.65
    trioctyl phosphate 93.73
    1-bromopropane 412.32
    gamma-valerolactone 320.58
    n-decanol 210.18
    triethyl phosphate 136.62
    4-methyl-2-pentanol 237.26
    propionitrile 303.61
    vinylene carbonate 141.43
    1,1,2-trichlorotrifluoroethane 233.84
    DMS 145.45
    cumene 100.02
    2-octanol 212.59
    2-hexanone 255.08
    octyl acetate 213.51
    limonene 290.9
    1,2-dimethoxyethane 371.73
    ethyl orthosilicate 158.27
    tributyl phosphate 117.95
    diacetone alcohol 271.35
    N,N-dimethylaniline 148.39
    acrylonitrile 228.37
    aniline 230.45
    1,3-propanediol 206.08
    bromobenzene 211.73
    dibromomethane 436.98
    1,1,2,2-tetrachloroethane 403.34
    2-methyl-cyclohexyl acetate 245.74
    tetrabutyl urea 141.37
    diisobutyl methanol 273.61
    2-phenylethanol 270.46
    styrene 172.19
    dioctyl adipate 181.28
    dimethyl sulfate 67.19
    ethyl butyrate 440.27
    methyl lactate 104.77
    butyl lactate 173.81
    diethyl carbonate 222.86
    propanediol butyl ether 220.04
    triethyl orthoformate 313.5
    p-tert-butyltoluene 170.64
    methyl 4-tert-butylbenzoate 197.75
    morpholine 595.53
    tert-butylamine 374.55
    n-dodecanol 169.09
    dimethoxymethane 178.78
    ethylene carbonate 138.47
    cyrene 136.5
    2-ethoxyethyl acetate 267.49
    2-ethylhexyl acetate 381.04
    1,2,4-trichlorobenzene 195.43
    4-methylpyridine 317.74
    dibutyl ether 460.28
    2,6-dimethyl-4-heptanol 273.61
    DEF 314.22
    dimethyl isosorbide 326.22
    tetrachloroethylene 269.64
    eugenol 182.19
    triacetin 209.21
    span 80 333.32
    1,4-butanediol 79.59
    1,1-dichloroethane 351.21
    2-methyl-1-pentanol 304.93
    methyl formate 57.19
    2-methyl-1-butanol 365.12
    n-decane 125.51
    butyronitrile 356.51
    3,7-dimethyl-1-octanol 300.79
    1-chlorooctane 233.37
    1-chlorotetradecane 101.21
    n-nonane 138.2
    undecane 88.53
    tert-butylcyclohexane 111.89
    cyclooctane 121.74
    cyclopentanol 263.18
    tetrahydropyran 651.63
    tert-amyl methyl ether 449.01
    2,5,8-trioxanonane 391.76
    1-hexene 527.91
    2-isopropoxyethanol 227.62
    2,2,2-trifluoroethanol 52.09
    methyl butyrate 248.41

    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