1-Butene

Overview IFRA Request a quote

  • Identifiers

    CAS number
    106-98-9

    Molecular formula
    C4H8

    SMILES
    CCC=C

    Safety labels

    Flammable
    Flammable

    Compressed Gas
    Compressed Gas

  • Odor profile

    Fragrance
    Gassy 57.35%
    Ethereal 47.09%
    Fruity 45.6%
    Pungent 43.79%
    Green 42.46%
    Fresh 34.29%
    Sharp 30.5%
    Nutty 22.38%
    Musty 20.51%
    Vegetable 20.09%

     

    Flavor
    Fruity 47.0%
    Green 45.91%
    Pungent 40.85%
    Fatty 31.24%
    Ethereal 31.01%
    Nutty 28.86%
    Citrus 28.74%
    Vegetable 26.52%
    Aldehydic 26.09%
    Earthy 23.75%

     

    Odor impact est.
    Low

    Odor threshold

    • 69 ppb
    • The odor threshold for butene is 54.96 mg/cu m.

  • Properties

    XLogP3-AA
    2.4

    pKa est.
    9.06 (weak base)

    Molecular weight
    56.11 g/mol

    Vapor pressure est.

    • hPa @ 20°C
    • hPa @ 25°C

    Evaporation rate
    Ultra fast

    Melting point expt.

    • -301.5 °F (NTP, 1992)
    • -185.33 °C
    • -185 °C

    Boiling point

    • 21 °F at 760 mmHg (NTP, 1992)
    • -6.47 °C at 760 mm Hg
    • -6 °C

    Flash point

    • -66.96 ˚C est.
    • -110 °F (NTP, 1992)
    • Flammable gas

    Solubility expt.

    • Insoluble (NTP, 1992)
    • In water, 221 mg/L at 25 °C
    • Soluble in benzene; very soluble in alcohol, ether
    • Solubility in water: none

  • Synonyms

    • 1-BUTENE
    • But-1-ene
    • 106-98-9
    • Ethylethylene
    • BUTENE
    • 1-Butylene
    • Butene-1
    • alpha-Butylene
    • alpha-Butene
    • 1-C4H8
    • CCRIS 8970
    • HSDB 179
    • 25167-67-3
    • .alpha.-Butene
    • .alpha.-Butylene
    • EINECS 203-449-2
    • UNII-LY001N554L
    • CHEBI:48362
    • LY001N554L
    • DTXSID1026746
    • But-1-ene (10% in Hexanes)
    • EC 203-449-2
    • 1-Butene (ca. 10% in Hexane)
    • MFCD00009383
    • Butene, 1-
    • 1-n-Butene
    • 1-Butene; 1-Butylene; Butene-1; Ethylethylene; a-Butene; a-Butylene
    • Actipol E6
    • but-1-en-3-yl
    • 1-BUTENE [HSDB]
    • 1-BUTENE [MI]
    • 1-Butene, >=99%
    • CHEMBL117210
    • DTXCID606746
    • 1-Butene, >=99.6%
    • DTXSID80983963
    • 1-Butene (ca. 10% in Toluene)
    • 1-Butene, >=99.0% (GC)
    • AKOS009156841
    • DB-040719
    • B0689
    • B4410
    • B4411
    • NS00009034
    • InChI=1/C4H8/c1-3-4-2/h3H,1,4H2,2H
    • Q2468763
    • 203-449-2
    • 6993-22-2

  • Applications

    1-Butene (CAS 106-98-9) is primarily used as a reactive olefin monomer and feedstock for polyolefin production. It acts as a comonomer with ethylene to produce copolymers such as linear low-density polyethylene (LLDPE), enabling packaging films with controlled density and flexibility. It also participates in alkylation processes to yield high-octane gasoline components (alkylates) when combined with isobutane under acid catalysis. As an intermediate in hydroformylation and related transformations, it can be converted to valeraldehyde and downstream derivatives (alcohols, acids, esters) for use in plasticizers, surfactants, and specialty chemicals. It can be oligomerized or polymerized to give polybutenes, which find use as base fluids and viscosity modifiers in lubricants and as tackifying resins in adhesives. In coatings and inks, it can be used as a reactive diluent or comonomer to tailor resin properties. All applications are subject to local regulations and formulation limits.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 177.07
    methanol 109.25
    isopropanol 142.56
    water 0.1
    ethyl acetate 259.19
    n-propanol 180.23
    acetone 111.17
    n-butanol 246.5
    acetonitrile 115.87
    DMF 77.63
    toluene 124.64
    isobutanol 121.96
    1,4-dioxane 253.04
    methyl acetate 141.4
    THF 420.2
    2-butanone 170.44
    n-pentanol 153.69
    sec-butanol 193.77
    n-hexane 192.68
    ethylene glycol 21.53
    NMP 100.67
    cyclohexane 159.77
    DMSO 123.52
    n-butyl acetate 535.64
    n-octanol 111.86
    chloroform 459.1
    n-propyl acetate 155.02
    acetic acid 100.04
    dichloromethane 343.54
    cyclohexanone 215.74
    propylene glycol 45.0
    isopropyl acetate 151.24
    DMAc 86.14
    2-ethoxyethanol 120.15
    isopentanol 186.49
    n-heptane 311.09
    ethyl formate 82.34
    1,2-dichloroethane 201.58
    n-hexanol 389.61
    2-methoxyethanol 161.86
    isobutyl acetate 95.43
    tetrachloromethane 133.61
    n-pentyl acetate 145.14
    transcutol 538.86
    n-heptanol 124.3
    ethylbenzene 70.72
    MIBK 118.07
    2-propoxyethanol 312.7
    tert-butanol 191.39
    MTBE 233.26
    2-butoxyethanol 143.97
    propionic acid 115.57
    o-xylene 68.57
    formic acid 18.14
    diethyl ether 335.69
    m-xylene 79.59
    p-xylene 70.89
    chlorobenzene 135.81
    dimethyl carbonate 28.98
    n-octane 68.87
    formamide 20.98
    cyclopentanone 198.07
    2-pentanone 196.5
    anisole 98.07
    cyclopentyl methyl ether 231.11
    gamma-butyrolactone 174.98
    1-methoxy-2-propanol 154.23
    pyridine 240.95
    3-pentanone 140.54
    furfural 153.88
    n-dodecane 35.01
    diethylene glycol 135.58
    diisopropyl ether 119.16
    tert-amyl alcohol 205.96
    acetylacetone 139.15
    n-hexadecane 37.31
    acetophenone 77.52
    methyl propionate 120.66
    isopentyl acetate 316.49
    trichloroethylene 301.45
    n-nonanol 108.97
    cyclohexanol 174.66
    benzyl alcohol 70.72
    2-ethylhexanol 314.93
    isooctanol 98.73
    dipropyl ether 495.56
    1,2-dichlorobenzene 108.35
    ethyl lactate 49.61
    propylene carbonate 123.57
    n-methylformamide 46.45
    2-pentanol 193.77
    n-pentane 168.1
    1-propoxy-2-propanol 327.49
    1-methoxy-2-propyl acetate 221.98
    2-(2-methoxypropoxy) propanol 133.59
    mesitylene 54.42
    ε-caprolactone 197.52
    p-cymene 102.85
    epichlorohydrin 220.2
    1,1,1-trichloroethane 246.49
    2-aminoethanol 54.82
    morpholine-4-carbaldehyde 129.34
    sulfolane 159.57
    2,2,4-trimethylpentane 54.42
    2-methyltetrahydrofuran 373.75
    n-hexyl acetate 165.33
    isooctane 46.56
    2-(2-butoxyethoxy)ethanol 198.78
    sec-butyl acetate 108.8
    tert-butyl acetate 153.05
    decalin 59.51
    glycerin 48.73
    diglyme 295.43
    acrylic acid 71.01
    isopropyl myristate 80.59
    n-butyric acid 222.9
    acetyl acetate 123.07
    di(2-ethylhexyl) phthalate 57.4
    ethyl propionate 128.47
    nitromethane 100.7
    1,2-diethoxyethane 378.9
    benzonitrile 110.69
    trioctyl phosphate 49.1
    1-bromopropane 328.1
    gamma-valerolactone 191.99
    n-decanol 86.86
    triethyl phosphate 85.53
    4-methyl-2-pentanol 106.19
    propionitrile 170.25
    vinylene carbonate 91.49
    1,1,2-trichlorotrifluoroethane 143.07
    DMS 78.72
    cumene 49.9
    2-octanol 84.86
    2-hexanone 155.29
    octyl acetate 98.45
    limonene 182.47
    1,2-dimethoxyethane 206.81
    ethyl orthosilicate 98.67
    tributyl phosphate 67.72
    diacetone alcohol 136.59
    N,N-dimethylaniline 65.54
    acrylonitrile 124.29
    aniline 111.38
    1,3-propanediol 94.19
    bromobenzene 151.55
    dibromomethane 335.28
    1,1,2,2-tetrachloroethane 259.07
    2-methyl-cyclohexyl acetate 148.98
    tetrabutyl urea 75.7
    diisobutyl methanol 161.9
    2-phenylethanol 147.09
    styrene 88.58
    dioctyl adipate 95.26
    dimethyl sulfate 38.02
    ethyl butyrate 319.75
    methyl lactate 48.32
    butyl lactate 89.86
    diethyl carbonate 157.41
    propanediol butyl ether 94.97
    triethyl orthoformate 201.53
    p-tert-butyltoluene 95.91
    methyl 4-tert-butylbenzoate 80.27
    morpholine 291.53
    tert-butylamine 178.54
    n-dodecanol 73.42
    dimethoxymethane 96.06
    ethylene carbonate 84.48
    cyrene 62.93
    2-ethoxyethyl acetate 143.89
    2-ethylhexyl acetate 294.06
    1,2,4-trichlorobenzene 113.73
    4-methylpyridine 189.87
    dibutyl ether 278.09
    2,6-dimethyl-4-heptanol 161.9
    DEF 155.34
    dimethyl isosorbide 182.71
    tetrachloroethylene 184.15
    eugenol 77.97
    triacetin 111.77
    span 80 152.45
    1,4-butanediol 32.86
    1,1-dichloroethane 219.72
    2-methyl-1-pentanol 147.42
    methyl formate 29.74
    2-methyl-1-butanol 180.77
    n-decane 60.27
    butyronitrile 230.01
    3,7-dimethyl-1-octanol 136.38
    1-chlorooctane 110.96
    1-chlorotetradecane 50.57
    n-nonane 67.72
    undecane 43.92
    tert-butylcyclohexane 57.69
    cyclooctane 75.86
    cyclopentanol 143.42
    tetrahydropyran 399.54
    tert-amyl methyl ether 195.8
    2,5,8-trioxanonane 210.04
    1-hexene 328.1
    2-isopropoxyethanol 101.34
    2,2,2-trifluoroethanol 21.7
    methyl butyrate 148.64

    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