1-Methylcyclopentene

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  • Identifiers

    CAS number
    693-89-0

    Molecular formula
    C6H10

    SMILES
    CC1=CCCC1

    Safety labels

    Flammable
    Flammable

    Health Hazard
    Health

  • Odor profile

    Fragrance
    Citrus 64.71%
    Woody 50.75%
    Lemon 46.79%
    Dry 35.33%
    Spicy 31.46%
    Terpenic 30.55%
    Gassy 29.48%
    Musk 28.83%
    Earthy 28.21%
    Sweet 27.07%

     

    Flavor
    Wood 32.74%
    Woody 29.92%
    Spice 22.73%
    Camphor 20.16%
    Shrimp 19.9%
    Beet 19.48%
    Soil 19.41%
    Terpentine 19.24%
    Citric 19.19%
    Old paper 18.87%

     

    Odor impact est.
    High

  • Properties

    XLogP3-AA
    1.8

    pKa est.
    9.97 (weak base)

    Molecular weight
    82.14 g/mol

    Vapor pressure est.

    • hPa @ 20°C
    • hPa @ 25°C

    Evaporation rate
    Ultra fast

    Boiling point est.
    81°C

    Flash point

    • -12.96 ˚C est.

  • Synonyms

    • 1-METHYLCYCLOPENTENE
    • 693-89-0
    • 1-Methyl-1-cyclopentene
    • Cyclopentene, 1-methyl-
    • V03M1DZC9I
    • EINECS 211-762-0
    • NSC 64657
    • NSC-64657
    • RefChem:434590
    • Cyclopentene, 1-methyl-(8CI)
    • Cyclopentene, 1-methyl-(8CI)(9CI)
    • 211-762-0
    • InChI=1/C6H10/c1-6-4-2-3-5-6/h4H,2-3,5H2,1H
    • 1-methylcyclopent-1-ene
    • Cyclopentene, methyl-
    • Methylcyclopentene
    • 27476-50-2
    • MFCD00001397
    • UNII-V03M1DZC9I
    • 1-methylcyclopentene-1
    • Cyc1opentene,l-methyl-
    • 1-Methyl-1-cyclopentane
    • 1-Cyclopentene, 1-methyl
    • SCHEMBL2808
    • SCHEMBL2809
    • 1-Methylcyclopentene, 98%
    • SCHEMBL79228
    • SCHEMBL291795
    • SCHEMBL766765
    • SCHEMBL767081
    • SCHEMBL767090
    • SCHEMBL6641693
    • SCHEMBL9844727
    • DTXSID50870755
    • NSC64657
    • AKOS015842607
    • DB-000118
    • M0727
    • NS00042345
    • EN300-78632
    • A10734
    • 693M890
    • A836472
    • Q24736866
    • 693-89-0

  • Applications

    1-Methylcyclopentene (CAS 693-89-0) is used primarily as a chemical intermediate to access cyclopentane-based structures, including pharmaceutical and specialty chemical intermediates. It also serves as a building block in fragrance chemistry, acting as a precursor for odor-active cyclopentane derivatives. In polymer and coatings applications, it can function as a reactive monomer or co-monomer in specialty resins to impart cyclopentane motifs. It may participate in olefin functionalization to generate functionalized cyclopentane derivatives (such as alcohols, ethers, or amines) for downstream syntheses. Its use is subject to local regulations and formulation limits.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 795.78
    methanol 526.88
    isopropanol 686.21
    water 1.05
    ethyl acetate 1335.06
    n-propanol 793.47
    acetone 589.44
    n-butanol 833.13
    acetonitrile 746.49
    DMF 364.7
    toluene 724.86
    isobutanol 512.31
    1,4-dioxane 1583.41
    methyl acetate 833.23
    THF 1304.8
    2-butanone 796.14
    n-pentanol 555.43
    sec-butanol 819.51
    n-hexane 507.46
    ethylene glycol 139.29
    NMP 387.41
    cyclohexane 506.82
    DMSO 392.97
    n-butyl acetate 1141.19
    n-octanol 457.64
    chloroform 2278.72
    n-propyl acetate 485.93
    acetic acid 448.56
    dichloromethane 1452.28
    cyclohexanone 649.49
    propylene glycol 305.07
    isopropyl acetate 733.11
    DMAc 513.55
    2-ethoxyethanol 573.07
    isopentanol 657.98
    n-heptane 619.24
    ethyl formate 325.11
    1,2-dichloroethane 793.84
    n-hexanol 1071.1
    2-methoxyethanol 755.14
    isobutyl acetate 302.42
    tetrachloromethane 535.08
    n-pentyl acetate 435.97
    transcutol 2321.47
    n-heptanol 438.56
    ethylbenzene 332.3
    MIBK 468.79
    2-propoxyethanol 1140.02
    tert-butanol 791.39
    MTBE 1033.53
    2-butoxyethanol 569.0
    propionic acid 554.74
    o-xylene 392.2
    formic acid 101.09
    diethyl ether 1539.55
    m-xylene 460.67
    p-xylene 314.51
    chlorobenzene 561.15
    dimethyl carbonate 227.93
    n-octane 172.37
    formamide 152.38
    cyclopentanone 652.55
    2-pentanone 753.71
    anisole 586.56
    cyclopentyl methyl ether 830.2
    gamma-butyrolactone 604.76
    1-methoxy-2-propanol 768.95
    pyridine 1054.38
    3-pentanone 674.11
    furfural 532.62
    n-dodecane 110.0
    diethylene glycol 596.93
    diisopropyl ether 563.18
    tert-amyl alcohol 799.77
    acetylacetone 642.29
    n-hexadecane 118.06
    acetophenone 370.62
    methyl propionate 701.87
    isopentyl acetate 775.02
    trichloroethylene 1259.76
    n-nonanol 430.6
    cyclohexanol 594.49
    benzyl alcohol 364.19
    2-ethylhexanol 778.82
    isooctanol 337.66
    dipropyl ether 1271.38
    1,2-dichlorobenzene 457.91
    ethyl lactate 216.01
    propylene carbonate 430.52
    n-methylformamide 258.25
    2-pentanol 741.2
    n-pentane 496.19
    1-propoxy-2-propanol 1102.43
    1-methoxy-2-propyl acetate 912.62
    2-(2-methoxypropoxy) propanol 593.99
    mesitylene 279.85
    ε-caprolactone 675.42
    p-cymene 330.46
    epichlorohydrin 826.49
    1,1,1-trichloroethane 1086.35
    2-aminoethanol 340.68
    morpholine-4-carbaldehyde 656.56
    sulfolane 431.39
    2,2,4-trimethylpentane 184.94
    2-methyltetrahydrofuran 1195.37
    n-hexyl acetate 602.88
    isooctane 162.35
    2-(2-butoxyethoxy)ethanol 819.67
    sec-butyl acetate 415.05
    tert-butyl acetate 683.39
    decalin 196.75
    glycerin 297.45
    diglyme 1212.47
    acrylic acid 376.4
    isopropyl myristate 303.79
    n-butyric acid 806.06
    acetyl acetate 674.48
    di(2-ethylhexyl) phthalate 217.5
    ethyl propionate 533.71
    nitromethane 527.24
    1,2-diethoxyethane 1326.36
    benzonitrile 432.44
    trioctyl phosphate 147.99
    1-bromopropane 1049.7
    gamma-valerolactone 692.81
    n-decanol 331.59
    triethyl phosphate 240.06
    4-methyl-2-pentanol 433.93
    propionitrile 779.64
    vinylene carbonate 369.13
    1,1,2-trichlorotrifluoroethane 586.79
    DMS 380.62
    cumene 215.02
    2-octanol 298.77
    2-hexanone 493.32
    octyl acetate 377.24
    limonene 532.43
    1,2-dimethoxyethane 778.75
    ethyl orthosilicate 275.63
    tributyl phosphate 185.42
    diacetone alcohol 551.55
    N,N-dimethylaniline 341.03
    acrylonitrile 621.52
    aniline 644.47
    1,3-propanediol 452.38
    bromobenzene 677.22
    dibromomethane 1266.18
    1,1,2,2-tetrachloroethane 1157.0
    2-methyl-cyclohexyl acetate 422.01
    tetrabutyl urea 226.69
    diisobutyl methanol 402.36
    2-phenylethanol 561.6
    styrene 431.04
    dioctyl adipate 330.27
    dimethyl sulfate 214.02
    ethyl butyrate 824.14
    methyl lactate 266.38
    butyl lactate 281.9
    diethyl carbonate 463.32
    propanediol butyl ether 430.81
    triethyl orthoformate 572.46
    p-tert-butyltoluene 325.61
    methyl 4-tert-butylbenzoate 381.12
    morpholine 1538.46
    tert-butylamine 710.61
    n-dodecanol 272.2
    dimethoxymethane 516.64
    ethylene carbonate 355.19
    cyrene 260.52
    2-ethoxyethyl acetate 628.83
    2-ethylhexyl acetate 683.19
    1,2,4-trichlorobenzene 521.48
    4-methylpyridine 833.75
    dibutyl ether 798.73
    2,6-dimethyl-4-heptanol 402.36
    DEF 685.76
    dimethyl isosorbide 650.52
    tetrachloroethylene 752.89
    eugenol 353.59
    triacetin 466.83
    span 80 554.1
    1,4-butanediol 181.35
    1,1-dichloroethane 1035.7
    2-methyl-1-pentanol 492.8
    methyl formate 148.09
    2-methyl-1-butanol 647.03
    n-decane 188.51
    butyronitrile 770.43
    3,7-dimethyl-1-octanol 490.52
    1-chlorooctane 386.77
    1-chlorotetradecane 179.12
    n-nonane 207.64
    undecane 136.48
    tert-butylcyclohexane 182.91
    cyclooctane 250.05
    cyclopentanol 470.6
    tetrahydropyran 1488.11
    tert-amyl methyl ether 818.49
    2,5,8-trioxanonane 865.27
    1-hexene 834.68
    2-isopropoxyethanol 497.24
    2,2,2-trifluoroethanol 146.48
    methyl butyrate 492.46

    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