2-Methyl-2-butene

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  • Identifiers

    CAS number
    513-35-9

    Molecular formula
    C5H10

    SMILES
    CC=C(C)C

    Safety labels

    Flammable
    Flammable

    Irritant
    Irritant

    Health Hazard
    Health

    Environmental Hazard
    Environmental

  • Odor profile

    Fragrance
    Gassy 46.67%
    Fresh 44.65%
    Herbal 41.21%
    Citrus 36.67%
    Ethereal 36.4%
    Camphoreous 34.67%
    Terpenic 33.87%
    Woody 32.11%
    Lemon 31.23%
    Green 29.41%

     

    Flavor
    Citrus 42.23%
    Green 37.16%
    Sweet 35.03%
    Fruity 33.47%
    Pungent 32.79%
    Nutty 32.72%
    Woody 30.24%
    Gasoline 28.0%
    Ethereal 27.04%
    Earthy 26.62%

     

    Odor impact est.
    Medium

  • Properties

    XLogP3-AA
    2.3

    pKa est.
    11.03 (strong base)

    Molecular weight
    70.13 g/mol

    Vapor pressure est.

    • hPa @ 20°C
    • hPa @ 25°C

    Evaporation rate
    Ultra fast

    Melting point expt.

    • -133.61 °C

    Boiling point

    • 37.5-38.5 °C

    Flash point

    • -47.17 ˚C est.
    • less than 20 °F (NFPA, 2010)
    • -17.8 °C

    Solubility expt.

    • Practically insol in water; miscible with alcohol, ether
    • Insoluble in water; Soluble in ethanol, ethyl ether, benzene

  • Synonyms

    • 2-Methyl-2-butene
    • 2-Methylbut-2-ene
    • 513-35-9
    • AMYLENE
    • Trimethylethylene
    • 2-Butene, 2-methyl-
    • n-Amylene
    • 3-Methyl-2-butene
    • 2-Methylbutene-2
    • 1,1,2-Trimethylethylene
    • Ethylene, trimethyl-
    • beta-Isoamylene
    • .beta.-Isoamylene
    • Amylene (VAN)
    • b-isoamylene
    • Methyl butene
    • UNII-HR68LQ4T3X
    • HR68LQ4T3X
    • MFCD00009276
    • HSDB 2072
    • AMYLENE [HSDB]
    • AMYLENE [MI]
    • EINECS 208-156-3
    • NSC 74118
    • NSC-74118
    • UN2460
    • (CH3)2C=CHCH3
    • AI3-37711
    • DTXSID8027165
    • CHEBI:77916
    • EC 208-156-3
    • UN 2460
    • 2-Methyl-2-butene, Technical Grade 90%
    • 28265-98-7
    • trimethylethene
    • betaIsoamylene
    • iso-amylene
    • tert-amylene
    • trimethyl ethene
    • 2Methylbut2ene
    • 3Methyl2butene
    • ss -Isoamylene
    • 2-methyl2-butene
    • 2Butene, 2methyl
    • Ethylene, trimethyl
    • P1W
    • 2-methyl 2-butene
    • 2-methyl-2 butene
    • 2-Methyl-2-buten
    • Methyl butene (dot)
    • 2-methy-but-2-ene
    • 2-methyl-but-2-ene
    • 1,2-Trimethylethylene
    • 1,1,2Trimethylethylene
    • 1,1, 2-Trimethylethylene
    • 2-Methyl-2-butene solution
    • 2-Methyl-2-butene [UN2460] [Flammable liquid]
    • DTXCID707165
    • CHEBI:28798
    • CHEBI:53406
    • WLN: 2UY1&1
    • NSC74118
    • AKOS009157092
    • 2-Methyl-2-butene, analytical standard
    • 2-Methyl-2-butene, >=95.0% (GC)
    • 2-Methyl-2-butene, technical grade, 90%
    • M0708
    • NS00002546
    • P0067
    • EN300-50207
    • 2-Methyl-2-butene, Technical Grade 90per cent
    • A828541
    • Q2187069
    • 2-Methyl-2-butene, >=99%, purified by redistillation
    • 2-Methyl-2-butene, tech. 90%, remainder mainly 2-methyl-1-butene

  • Applications

    2-Methyl-2-butene (CAS 513-35-9) is a C5 olefin mainly used as a chemical feedstock and intermediate in chemical manufacturing, serving functional transformations to produce fragrance-related compounds and other specialty aromatics; it also acts as a precursor in the synthesis of aldehydes and other downstream products via reactions such as hydroformylation. As a potential monomer or comonomer, it is sometimes copolymerized to tailor polymer and plastic properties. In coatings, inks, and adhesives, it can function as a reactive diluent or processing solvent to optimize formulation and processing. It may also be used as a precursor for plasticizers or other specialty additives. All applications are subject to local regulations and formulation limits.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 414.05
    methanol 267.33
    isopropanol 409.17
    water 0.9
    ethyl acetate 677.43
    n-propanol 413.74
    acetone 355.52
    n-butanol 496.97
    acetonitrile 349.1
    DMF 317.74
    toluene 374.09
    isobutanol 296.09
    1,4-dioxane 768.79
    methyl acetate 448.39
    THF 909.3
    2-butanone 489.71
    n-pentanol 339.29
    sec-butanol 534.64
    n-hexane 549.52
    ethylene glycol 65.03
    NMP 406.25
    cyclohexane 430.09
    DMSO 220.59
    n-butyl acetate 644.7
    n-octanol 374.24
    chloroform 1183.06
    n-propyl acetate 293.28
    acetic acid 246.38
    dichloromethane 732.7
    cyclohexanone 440.56
    propylene glycol 158.27
    isopropyl acetate 454.54
    DMAc 467.51
    2-ethoxyethanol 296.66
    isopentanol 403.79
    n-heptane 721.03
    ethyl formate 181.87
    1,2-dichloroethane 409.36
    n-hexanol 693.0
    2-methoxyethanol 398.01
    isobutyl acetate 203.38
    tetrachloromethane 374.62
    n-pentyl acetate 330.67
    transcutol 1001.86
    n-heptanol 355.64
    ethylbenzene 264.58
    MIBK 305.38
    2-propoxyethanol 646.14
    tert-butanol 584.75
    MTBE 745.07
    2-butoxyethanol 376.46
    propionic acid 291.71
    o-xylene 271.29
    formic acid 49.55
    diethyl ether 852.02
    m-xylene 271.32
    p-xylene 267.08
    chlorobenzene 306.23
    dimethyl carbonate 122.15
    n-octane 218.57
    formamide 77.95
    cyclopentanone 494.1
    2-pentanone 471.9
    anisole 393.18
    cyclopentyl methyl ether 621.63
    gamma-butyrolactone 396.97
    1-methoxy-2-propanol 459.36
    pyridine 523.55
    3-pentanone 440.99
    furfural 330.51
    n-dodecane 120.41
    diethylene glycol 269.53
    diisopropyl ether 393.51
    tert-amyl alcohol 682.91
    acetylacetone 371.52
    n-hexadecane 128.9
    acetophenone 274.16
    methyl propionate 385.23
    isopentyl acetate 460.2
    trichloroethylene 672.19
    n-nonanol 358.35
    cyclohexanol 411.83
    benzyl alcohol 215.75
    2-ethylhexanol 576.87
    isooctanol 283.78
    dipropyl ether 1002.42
    1,2-dichlorobenzene 270.41
    ethyl lactate 149.38
    propylene carbonate 272.26
    n-methylformamide 147.4
    2-pentanol 495.87
    n-pentane 455.92
    1-propoxy-2-propanol 727.87
    1-methoxy-2-propyl acetate 502.61
    2-(2-methoxypropoxy) propanol 422.44
    mesitylene 183.25
    ε-caprolactone 441.7
    p-cymene 259.36
    epichlorohydrin 493.61
    1,1,1-trichloroethane 724.33
    2-aminoethanol 166.71
    morpholine-4-carbaldehyde 427.51
    sulfolane 337.82
    2,2,4-trimethylpentane 200.21
    2-methyltetrahydrofuran 904.69
    n-hexyl acetate 454.61
    isooctane 138.46
    2-(2-butoxyethoxy)ethanol 524.63
    sec-butyl acetate 285.44
    tert-butyl acetate 467.74
    decalin 204.77
    glycerin 139.79
    diglyme 729.32
    acrylic acid 205.41
    isopropyl myristate 278.04
    n-butyric acid 442.04
    acetyl acetate 353.03
    di(2-ethylhexyl) phthalate 174.02
    ethyl propionate 362.9
    nitromethane 278.03
    1,2-diethoxyethane 699.2
    benzonitrile 244.03
    trioctyl phosphate 135.12
    1-bromopropane 647.02
    gamma-valerolactone 451.63
    n-decanol 280.07
    triethyl phosphate 205.48
    4-methyl-2-pentanol 299.82
    propionitrile 394.66
    vinylene carbonate 202.7
    1,1,2-trichlorotrifluoroethane 364.81
    DMS 242.51
    cumene 187.24
    2-octanol 284.75
    2-hexanone 342.99
    octyl acetate 341.45
    limonene 438.63
    1,2-dimethoxyethane 504.44
    ethyl orthosilicate 236.8
    tributyl phosphate 154.42
    diacetone alcohol 404.18
    N,N-dimethylaniline 287.86
    acrylonitrile 317.14
    aniline 352.21
    1,3-propanediol 218.85
    bromobenzene 341.29
    dibromomethane 681.17
    1,1,2,2-tetrachloroethane 690.13
    2-methyl-cyclohexyl acetate 346.3
    tetrabutyl urea 188.89
    diisobutyl methanol 343.61
    2-phenylethanol 337.1
    styrene 311.58
    dioctyl adipate 279.23
    dimethyl sulfate 132.81
    ethyl butyrate 553.03
    methyl lactate 168.47
    butyl lactate 219.72
    diethyl carbonate 306.93
    propanediol butyl ether 264.63
    triethyl orthoformate 418.8
    p-tert-butyltoluene 274.32
    methyl 4-tert-butylbenzoate 339.06
    morpholine 834.48
    tert-butylamine 539.2
    n-dodecanol 232.04
    dimethoxymethane 295.51
    ethylene carbonate 191.35
    cyrene 207.08
    2-ethoxyethyl acetate 353.66
    2-ethylhexyl acetate 431.32
    1,2,4-trichlorobenzene 334.32
    4-methylpyridine 469.9
    dibutyl ether 623.04
    2,6-dimethyl-4-heptanol 343.61
    DEF 491.7
    dimethyl isosorbide 472.1
    tetrachloroethylene 439.91
    eugenol 273.25
    triacetin 344.01
    span 80 448.43
    1,4-butanediol 88.91
    1,1-dichloroethane 589.71
    2-methyl-1-pentanol 346.55
    methyl formate 90.03
    2-methyl-1-butanol 420.13
    n-decane 208.69
    butyronitrile 418.57
    3,7-dimethyl-1-octanol 378.81
    1-chlorooctane 387.45
    1-chlorotetradecane 177.99
    n-nonane 235.87
    undecane 150.84
    tert-butylcyclohexane 215.94
    cyclooctane 238.15
    cyclopentanol 359.27
    tetrahydropyran 902.36
    tert-amyl methyl ether 704.55
    2,5,8-trioxanonane 552.31
    1-hexene 740.05
    2-isopropoxyethanol 286.22
    2,2,2-trifluoroethanol 83.14
    methyl butyrate 355.16

    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