Cyclopentene, 1-ethyl-2-methyl-

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  • Identifiers

    CAS number
    19780-56-4

    Molecular formula
    C8H14

    SMILES
    CCC1=C(CCC1)C

    Safety labels

  • Odor profile

    Fragrance
    Woody 61.55%
    Sweet 57.91%
    Citrus 53.81%
    Spicy 50.32%
    Herbal 49.83%
    Terpenic 44.33%
    Lemon 40.7%
    Fresh 37.59%
    Pine 33.46%
    Balsamic 32.84%

     

    Flavor
    Woody 51.68%
    Wood 39.98%
    Spicy 33.65%
    Sweet 31.05%
    Dry 29.28%
    Spice 29.1%
    Citrus 27.65%
    Earthy 26.19%
    Pine 22.95%
    Camphor 22.82%

     

    Odor impact est.
    High

  • Properties

    XLogP3-AA
    2.2

    pKa est.
    10.59 (weak base)

    Molecular weight
    110.2 g/mol

    Vapor pressure est.

    • hPa @ 20°C
    • hPa @ 25°C

    Evaporation rate
    Ultra fast

    Boiling point est.
    133°C

    Flash point

    • 15.95 ˚C est.

  • Synonyms

    • 1-Ethyl-2-methylcyclopentene
    • Methyl ethyl cyclopentene
    • Cyclopentene, 1-ethyl-2-methyl-
    • 2-Methyl-1-ethylcyclopentene
    • EINECS 243-303-5
    • DTXSID6066529
    • RefChem:129880
    • DTXCID3036157
    • 243-303-5
    • MMYZGQDXYZNAQW-UHFFFAOYSA-N
    • 19780-56-4
    • 1-ethyl-2-methylcyclopent-1-ene
    • 1-Ethyl-2-methyl-1-cyclopentene
    • SCHEMBL914857
    • SCHEMBL8408700
    • SCHEMBL11853474
    • 1-Ethyl-2-methyl-1-cyclopentene #
    • AKOS006273755
    • NS00026429
    • 19780-56-4

  • Applications

    Cyclopentene, 1-ethyl-2-methyl- (CAS 19780-56-4) is primarily used as an organic synthesis intermediate, serving as a building block for specialty monomers in polymers and plastics; it is also used as a reactive diluent or solvent in coatings and inks; in fragrance chemistry, it may be evaluated as an odor-active intermediate for perfumery; in process chemistry, it can be employed as an intermediate for pharmaceutical and agrochemical synthesis under controlled conditions; overall, its applications are subject to local regulations and formulation limits.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 1302.09
    methanol 993.76
    isopropanol 921.26
    water 0.32
    ethyl acetate 2094.95
    n-propanol 1175.89
    acetone 998.87
    n-butanol 1457.53
    acetonitrile 1293.51
    DMF 469.25
    toluene 1680.47
    isobutanol 820.02
    1,4-dioxane 3125.06
    methyl acetate 1118.43
    THF 3404.83
    2-butanone 1314.86
    n-pentanol 919.25
    sec-butanol 1069.37
    n-hexane 1214.29
    ethylene glycol 78.3
    NMP 701.39
    cyclohexane 1650.81
    DMSO 585.87
    n-butyl acetate 3554.12
    n-octanol 593.01
    chloroform 4198.84
    n-propyl acetate 1072.98
    acetic acid 578.51
    dichloromethane 3583.29
    cyclohexanone 1961.22
    propylene glycol 136.18
    isopropyl acetate 1334.27
    DMAc 486.46
    2-ethoxyethanol 774.07
    isopentanol 1291.18
    n-heptane 1474.56
    ethyl formate 718.51
    1,2-dichloroethane 2059.21
    n-hexanol 2160.14
    2-methoxyethanol 1056.05
    isobutyl acetate 736.6
    tetrachloromethane 1264.58
    n-pentyl acetate 1084.04
    transcutol 3056.83
    n-heptanol 686.97
    ethylbenzene 665.43
    MIBK 962.18
    2-propoxyethanol 1995.31
    tert-butanol 1177.12
    MTBE 2353.47
    2-butoxyethanol 782.61
    propionic acid 544.08
    o-xylene 719.37
    formic acid 128.48
    diethyl ether 3871.19
    m-xylene 893.38
    p-xylene 669.6
    chlorobenzene 1447.9
    dimethyl carbonate 243.33
    n-octane 353.42
    formamide 181.26
    cyclopentanone 1472.32
    2-pentanone 1342.24
    anisole 1003.43
    cyclopentyl methyl ether 2173.63
    gamma-butyrolactone 1250.28
    1-methoxy-2-propanol 804.59
    pyridine 2314.32
    3-pentanone 1220.42
    furfural 1047.1
    n-dodecane 173.55
    diethylene glycol 615.8
    diisopropyl ether 1293.2
    tert-amyl alcohol 1086.73
    acetylacetone 1013.38
    n-hexadecane 200.02
    acetophenone 585.75
    methyl propionate 938.11
    isopentyl acetate 2576.07
    trichloroethylene 2757.88
    n-nonanol 578.34
    cyclohexanol 1227.99
    benzyl alcohol 498.71
    2-ethylhexanol 1761.79
    isooctanol 586.21
    dipropyl ether 3474.33
    1,2-dichlorobenzene 1091.4
    ethyl lactate 234.17
    propylene carbonate 841.42
    n-methylformamide 341.26
    2-pentanol 1089.65
    n-pentane 1051.29
    1-propoxy-2-propanol 1752.18
    1-methoxy-2-propyl acetate 1504.43
    2-(2-methoxypropoxy) propanol 720.54
    mesitylene 598.14
    ε-caprolactone 1584.14
    p-cymene 737.86
    epichlorohydrin 1876.21
    1,1,1-trichloroethane 2497.25
    2-aminoethanol 258.22
    morpholine-4-carbaldehyde 1003.17
    sulfolane 997.04
    2,2,4-trimethylpentane 364.84
    2-methyltetrahydrofuran 3476.05
    n-hexyl acetate 1216.88
    isooctane 355.84
    2-(2-butoxyethoxy)ethanol 1038.16
    sec-butyl acetate 812.92
    tert-butyl acetate 1410.47
    decalin 489.65
    glycerin 169.79
    diglyme 1766.81
    acrylic acid 328.11
    isopropyl myristate 597.36
    n-butyric acid 1324.07
    acetyl acetate 994.51
    di(2-ethylhexyl) phthalate 353.9
    ethyl propionate 901.85
    nitromethane 745.27
    1,2-diethoxyethane 3276.55
    benzonitrile 964.89
    trioctyl phosphate 270.02
    1-bromopropane 2760.37
    gamma-valerolactone 1553.56
    n-decanol 438.07
    triethyl phosphate 516.68
    4-methyl-2-pentanol 670.06
    propionitrile 1470.54
    vinylene carbonate 731.8
    1,1,2-trichlorotrifluoroethane 752.48
    DMS 551.08
    cumene 426.94
    2-octanol 461.76
    2-hexanone 1147.41
    octyl acetate 656.78
    limonene 1346.41
    1,2-dimethoxyethane 1752.05
    ethyl orthosilicate 620.51
    tributyl phosphate 384.51
    diacetone alcohol 767.21
    N,N-dimethylaniline 552.22
    acrylonitrile 1021.74
    aniline 1047.26
    1,3-propanediol 497.85
    bromobenzene 1771.91
    dibromomethane 2973.55
    1,1,2,2-tetrachloroethane 2198.2
    2-methyl-cyclohexyl acetate 1095.91
    tetrabutyl urea 443.56
    diisobutyl methanol 868.7
    2-phenylethanol 963.98
    styrene 848.09
    dioctyl adipate 579.37
    dimethyl sulfate 236.43
    ethyl butyrate 2058.64
    methyl lactate 217.76
    butyl lactate 442.21
    diethyl carbonate 1005.15
    propanediol butyl ether 407.17
    triethyl orthoformate 1304.59
    p-tert-butyltoluene 694.8
    methyl 4-tert-butylbenzoate 572.22
    morpholine 2911.39
    tert-butylamine 1161.86
    n-dodecanol 350.63
    dimethoxymethane 844.22
    ethylene carbonate 730.4
    cyrene 364.39
    2-ethoxyethyl acetate 1138.15
    2-ethylhexyl acetate 2321.14
    1,2,4-trichlorobenzene 1095.0
    4-methylpyridine 2004.48
    dibutyl ether 1861.19
    2,6-dimethyl-4-heptanol 868.7
    DEF 1126.63
    dimethyl isosorbide 1189.72
    tetrachloroethylene 1618.2
    eugenol 469.82
    triacetin 613.09
    span 80 676.15
    1,4-butanediol 158.91
    1,1-dichloroethane 2275.21
    2-methyl-1-pentanol 946.83
    methyl formate 232.69
    2-methyl-1-butanol 1181.95
    n-decane 327.58
    butyronitrile 1819.52
    3,7-dimethyl-1-octanol 818.79
    1-chlorooctane 729.56
    1-chlorotetradecane 308.07
    n-nonane 358.4
    undecane 223.38
    tert-butylcyclohexane 451.61
    cyclooctane 654.16
    cyclopentanol 866.34
    tetrahydropyran 4219.51
    tert-amyl methyl ether 1508.19
    2,5,8-trioxanonane 1192.15
    1-hexene 2038.34
    2-isopropoxyethanol 641.24
    2,2,2-trifluoroethanol 139.59
    methyl butyrate 1016.69

    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