4-Methyl-2-pentene, (2Z)-

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  • Identifiers

    CAS number
    691-38-3

    Molecular formula
    C6H12

    SMILES
    C/C=C\C(C)C

    Safety labels

    Flammable
    Flammable

    Irritant
    Irritant

    Health Hazard
    Health

  • Odor profile

    Fragrance
    Green 74.91%
    Fruity 68.49%
    Fresh 53.85%
    Gassy 39.53%
    Herbal 39.18%
    Ethereal 35.88%
    Sweet 33.11%
    Pungent 31.58%
    Woody 30.55%
    Apple 29.94%

     

    Flavor
    Citrus 39.89%
    Woody 26.83%
    Terpene 24.97%
    Gasoline 24.94%
    Fresh 24.85%
    Solvent 24.65%
    Green 23.69%
    Herbal 21.89%
    Glue 21.47%
    Low 20.98%

     

    Odor impact est.
    High

  • Properties

    XLogP3-AA
    2.4

    pKa est.
    9.68 (weak base)

    Molecular weight
    84.16 g/mol

    Vapor pressure est.

    • hPa @ 20°C
    • hPa @ 25°C

    Evaporation rate
    Ultra fast

    Boiling point est.
    60°C

    Flash point

    • -28.76 ˚C est.

    Solubility expt.

    • Practically insoluble to insoluble
    • Slightly Soluble (in ethanol)

  • Synonyms

    • cis-4-Methyl-2-pentene
    • 691-38-3
    • (Z)-4-Methyl-2-pentene
    • 4-Methyl-cis-2-pentene
    • (Z)-4-methylpent-2-ene
    • 2-Pentene, 4-methyl-, (Z)-
    • cis-4-Methylpent-2-ene
    • 4-Methyl-2-pentene, (2Z)-
    • 2-Pentene, 4-methyl-, (2Z)-
    • 64K11W5U2T
    • 4-Methyl-2-cis-pentene
    • EINECS 211-721-7
    • NSC 73913
    • NSC-73913
    • (2Z)-4-methylpent-2-ene
    • CIS-1-ISOPROPYLPROPENE
    • FEMA NO. 4650
    • CIS-2-METHYL-3-PENTENE
    • 4-METHYL-2-PENTENE, CIS-
    • 2-PENTENE, 4-METHYL-, CIS-
    • MFCD00065138
    • 2-Methyl-3-pentene
    • UNII-64K11W5U2T
    • 4Methylcis2pentene
    • cis4Methylpent2ene
    • NSC73913
    • (Z)4Methyl2pentene
    • cis-4-Metyhl-2-pentene
    • 4Methyl2pentene, (2Z)
    • 4-Methyl-2-pentene, cis
    • 4-Methylpentene-2, cis-
    • 2-Pentene, 4-methyl-cis-
    • (2Z)-4-Methyl-2-pentene
    • 2Pentene, 4methyl, (2Z)
    • (2Z)-4-Methyl-2-pentene #
    • DTXSID90880651
    • (Z)-(CH3)2CHCH=CHCH3
    • NSC19873
    • 2Pentene, 4methyl, (Z) (8CI)
    • MFCD00009293
    • NSC-19873
    • AKOS025295641
    • 2-Pentene, 4-methyl-, (Z)-(8CI)
    • 2Pentene, 4methyl, (Z) (8CI)(9CI)
    • M0393
    • NS00079495
    • 2-Pentene, 4-methyl-, (Z)-(8CI)(9CI)
    • T72834
    • Q27263760

  • Applications

    4-Methyl-2-pentene, (2Z) (CAS 691-38-3) is a branched internal hexene that serves as a chemical feedstock and building block in various industrial contexts. In polymers and plastics, it can function as a monomer or comonomer for branched polyolefins and specialty copolymers. It is used as an intermediate in organic synthesis to access higher-value olefin-derived compounds via hydrofunctionalization, oxidation, or related transformations. In coatings and inks, it may be employed as a monomer or reactive diluent for specialty resins and UV-curable systems. In fragrance and perfumery, it may be evaluated as an aroma intermediate or solvent in certain formulations, subject to regulatory constraints. In research and development, it serves as a starting material for studies on hydrofunctionalization, oxidation, and other functionalization routes to prepare higher-value chemicals.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 1345.21
    methanol 874.78
    isopropanol 1014.77
    water 0.22
    ethyl acetate 1146.14
    n-propanol 1174.52
    acetone 1049.57
    n-butanol 1662.75
    acetonitrile 599.21
    DMF 479.04
    toluene 756.9
    isobutanol 834.74
    1,4-dioxane 1740.64
    methyl acetate 735.17
    THF 3604.58
    2-butanone 1063.31
    n-pentanol 929.37
    sec-butanol 1124.8
    n-hexane 2576.63
    ethylene glycol 89.44
    NMP 783.27
    cyclohexane 2232.81
    DMSO 587.52
    n-butyl acetate 2881.29
    n-octanol 901.52
    chloroform 1684.43
    n-propyl acetate 736.18
    acetic acid 535.41
    dichloromethane 1291.73
    cyclohexanone 1662.15
    propylene glycol 187.32
    isopropyl acetate 760.73
    DMAc 438.91
    2-ethoxyethanol 561.68
    isopentanol 1255.91
    n-heptane 3401.06
    ethyl formate 478.86
    1,2-dichloroethane 888.31
    n-hexanol 3003.98
    2-methoxyethanol 880.81
    isobutyl acetate 530.37
    tetrachloromethane 689.03
    n-pentyl acetate 826.44
    transcutol 1741.61
    n-heptanol 963.84
    ethylbenzene 368.4
    MIBK 693.31
    2-propoxyethanol 1970.76
    tert-butanol 1381.51
    MTBE 1880.35
    2-butoxyethanol 831.09
    propionic acid 495.65
    o-xylene 409.08
    formic acid 86.02
    diethyl ether 2594.7
    m-xylene 484.92
    p-xylene 426.67
    chlorobenzene 601.09
    dimethyl carbonate 131.87
    n-octane 715.15
    formamide 90.44
    cyclopentanone 1367.52
    2-pentanone 1200.49
    anisole 463.4
    cyclopentyl methyl ether 2048.63
    gamma-butyrolactone 983.93
    1-methoxy-2-propanol 753.78
    pyridine 896.12
    3-pentanone 856.66
    furfural 611.38
    n-dodecane 318.22
    diethylene glycol 567.18
    diisopropyl ether 967.64
    tert-amyl alcohol 1264.94
    acetylacetone 629.23
    n-hexadecane 348.96
    acetophenone 301.07
    methyl propionate 578.53
    isopentyl acetate 1927.41
    trichloroethylene 1033.92
    n-nonanol 786.96
    cyclohexanol 1470.44
    benzyl alcohol 282.62
    2-ethylhexanol 2407.26
    isooctanol 728.49
    dipropyl ether 3487.4
    1,2-dichlorobenzene 442.78
    ethyl lactate 188.76
    propylene carbonate 647.67
    n-methylformamide 263.02
    2-pentanol 1255.9
    n-pentane 1903.11
    1-propoxy-2-propanol 2043.21
    1-methoxy-2-propyl acetate 1096.54
    2-(2-methoxypropoxy) propanol 545.32
    mesitylene 335.29
    ε-caprolactone 1212.95
    p-cymene 595.92
    epichlorohydrin 1130.8
    1,1,1-trichloroethane 1192.58
    2-aminoethanol 262.88
    morpholine-4-carbaldehyde 727.99
    sulfolane 943.55
    2,2,4-trimethylpentane 559.38
    2-methyltetrahydrofuran 3292.37
    n-hexyl acetate 1098.9
    isooctane 477.61
    2-(2-butoxyethoxy)ethanol 829.36
    sec-butyl acetate 543.85
    tert-butyl acetate 882.26
    decalin 594.59
    glycerin 179.06
    diglyme 1167.34
    acrylic acid 264.74
    isopropyl myristate 506.08
    n-butyric acid 1112.59
    acetyl acetate 462.11
    di(2-ethylhexyl) phthalate 289.97
    ethyl propionate 580.99
    nitromethane 440.87
    1,2-diethoxyethane 1766.37
    benzonitrile 416.4
    trioctyl phosphate 297.95
    1-bromopropane 1796.48
    gamma-valerolactone 1115.17
    n-decanol 608.82
    triethyl phosphate 350.22
    4-methyl-2-pentanol 678.54
    propionitrile 720.8
    vinylene carbonate 390.09
    1,1,2-trichlorotrifluoroethane 528.59
    DMS 324.08
    cumene 266.45
    2-octanol 676.06
    2-hexanone 978.42
    octyl acetate 610.49
    limonene 1434.9
    1,2-dimethoxyethane 1211.14
    ethyl orthosilicate 449.03
    tributyl phosphate 365.24
    diacetone alcohol 682.22
    N,N-dimethylaniline 300.01
    acrylonitrile 446.93
    aniline 567.89
    1,3-propanediol 492.39
    bromobenzene 674.19
    dibromomethane 1438.63
    1,1,2,2-tetrachloroethane 966.03
    2-methyl-cyclohexyl acetate 880.5
    tetrabutyl urea 415.57
    diisobutyl methanol 1077.5
    2-phenylethanol 655.59
    styrene 421.32
    dioctyl adipate 459.87
    dimethyl sulfate 135.71
    ethyl butyrate 1410.31
    methyl lactate 174.06
    butyl lactate 437.62
    diethyl carbonate 590.72
    propanediol butyl ether 485.12
    triethyl orthoformate 975.96
    p-tert-butyltoluene 577.89
    methyl 4-tert-butylbenzoate 390.96
    morpholine 1958.03
    tert-butylamine 1390.28
    n-dodecanol 495.87
    dimethoxymethane 629.85
    ethylene carbonate 433.43
    cyrene 294.77
    2-ethoxyethyl acetate 676.16
    2-ethylhexyl acetate 1846.35
    1,2,4-trichlorobenzene 471.53
    4-methylpyridine 955.02
    dibutyl ether 1952.25
    2,6-dimethyl-4-heptanol 1077.5
    DEF 905.38
    dimethyl isosorbide 840.54
    tetrachloroethylene 699.21
    eugenol 331.34
    triacetin 441.1
    span 80 691.52
    1,4-butanediol 167.21
    1,1-dichloroethane 1144.93
    2-methyl-1-pentanol 860.94
    methyl formate 183.15
    2-methyl-1-butanol 1200.07
    n-decane 604.56
    butyronitrile 1273.12
    3,7-dimethyl-1-octanol 1005.82
    1-chlorooctane 999.36
    1-chlorotetradecane 391.6
    n-nonane 743.4
    undecane 412.05
    tert-butylcyclohexane 599.15
    cyclooctane 982.69
    cyclopentanol 1147.0
    tetrahydropyran 3278.04
    tert-amyl methyl ether 1505.97
    2,5,8-trioxanonane 740.99
    1-hexene 2726.8
    2-isopropoxyethanol 491.5
    2,2,2-trifluoroethanol 100.31
    methyl butyrate 756.04

    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