Cyclopentene

Overview IFRA Request a quote

  • Identifiers

    CAS number
    142-29-0

    Molecular formula
    C5H8

    SMILES
    C1CC=CC1

    Safety labels

    Flammable
    Flammable

    Irritant
    Irritant

    Health Hazard
    Health

  • Odor profile

    Fragrance
    Citrus 49.44%
    Sweet 39.04%
    Gassy 33.99%
    Musk 31.52%
    Dry 29.47%
    Lemon 22.4%
    Amber 18.26%
    Warm 17.6%
    Waxy 17.49%
    Animal 16.85%

     

    Flavor
    Ammoniacal 26.98%
    Animal 22.35%
    Shrimp 20.22%
    Alkaline 18.99%
    Tarry 17.85%
    Tar 17.53%
    Terpentine 17.3%
    Rotten 17.28%
    Beet 16.27%
    Terpenic 16.22%

     

    Odor impact est.
    Low

  • Properties

    XLogP3-AA
    1.9

    pKa est.
    8.77 (weak base)

    Molecular weight
    68.12 g/mol

    Vapor pressure est.

    • hPa @ 20°C
    • hPa @ 25°C

    Evaporation rate
    Ultra fast

    Melting point expt.

    • -211 °F (USCG, 1999)

    Boiling point

    • 112 °F at 760 mmHg (USCG, 1999)

    Flash point

    • -23.27 ˚C est.
    • -30 °F (USCG, 1999)

  • Synonyms

    • CYCLOPENTENE
    • 142-29-0
    • 1-Cyclopentene
    • UNII-ONM2CKV81Z
    • ONM2CKV81Z
    • NSC 5160
    • EINECS 205-532-9
    • UN2246
    • DTXSID6029171
    • NSC-5160
    • DTXCID609171
    • CHEBI:49155
    • EC 205-532-9
    • RefChem:129879
    • 205-532-9
    • InChI=1/C5H8/c1-2-4-5-3-1/h1-2H,3-5H
    • LPIQUOYDBNQMRZ-UHFFFAOYSA-N
    • C5H8
    • MFCD00001394
    • 29300-20-7
    • 1-Cyclopentene #
    • Cyclopentene, 96%
    • WLN: L5UTJ
    • SCHEMBL1270
    • SCHEMBL9112
    • SCHEMBL37534
    • SCHEMBL68507
    • SCHEMBL130105
    • SCHEMBL130179
    • SCHEMBL327287
    • SCHEMBL330089
    • SCHEMBL330377
    • SCHEMBL374674
    • SCHEMBL449509
    • SCHEMBL449589
    • SCHEMBL450571
    • SCHEMBL3630272
    • SCHEMBL6860481
    • SCHEMBL7884186
    • SCHEMBL8776119
    • CHEMBL1797299
    • Cyclopentene, p.a., 99.0%
    • SCHEMBL17911641
    • SCHEMBL23908701
    • SCHEMBL23908706
    • NSC5160
    • Tox21_303765
    • AKOS000121282
    • FC45544
    • MSK162298-5000M
    • NCGC00356963-01
    • CAS-142-29-0
    • DB-360222
    • C1617
    • Cyclopentene [UN2246] [Flammable liquid]
    • NS00007646
    • Cyclopentene Solution in Methanol, 5000ug/mL
    • EN300-21672
    • Q415233
    • F0001-0496
    • 10016-46-3
    • 142-29-0

  • Applications

    Cyclopentene (CAS 142-29-0) is a cyclic olefin primarily used as an industrial intermediate and monomer for specialty polymers and resins. In the polymers and plastics sector it can be polymerized or copolymerized to form polycyclopentene and related copolymers for coatings, adhesives, and high-performance materials. In coatings and inks it can serve as an active monomer or a reactive diluent in UV-curable systems. It is also a building block for cyclopentyl derivatives such as cyclopentanol and cyclopentanone through standard functionalization routes. The epoxide derived from cyclopentene, cyclopentene oxide, is a versatile intermediate for further synthesis of polyols and other functional chemicals used in coatings and adhesives. Additionally, hydrogenation of cyclopentene to cyclopentane and other saturated derivatives may be used as process feedstocks; use and handling are subject to local regulations and formulation limits.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 850.16
    methanol 635.33
    isopropanol 750.17
    water 0.57
    ethyl acetate 598.97
    n-propanol 780.72
    acetone 834.66
    n-butanol 832.92
    acetonitrile 464.41
    DMF 543.7
    toluene 381.58
    isobutanol 565.36
    1,4-dioxane 1033.2
    methyl acetate 491.35
    THF 1758.86
    2-butanone 658.47
    n-pentanol 532.38
    sec-butanol 700.32
    n-hexane 616.83
    ethylene glycol 210.18
    NMP 539.47
    cyclohexane 650.66
    DMSO 736.19
    n-butyl acetate 821.84
    n-octanol 364.49
    chloroform 1151.74
    n-propyl acetate 376.31
    acetic acid 604.06
    dichloromethane 838.25
    cyclohexanone 728.04
    propylene glycol 394.2
    isopropyl acetate 378.66
    DMAc 444.0
    2-ethoxyethanol 487.13
    isopentanol 595.35
    n-heptane 796.57
    ethyl formate 250.38
    1,2-dichloroethane 560.52
    n-hexanol 1124.42
    2-methoxyethanol 747.11
    isobutyl acetate 267.77
    tetrachloromethane 309.59
    n-pentyl acetate 268.94
    transcutol 1520.01
    n-heptanol 385.48
    ethylbenzene 188.67
    MIBK 373.53
    2-propoxyethanol 1121.57
    tert-butanol 822.58
    MTBE 754.13
    2-butoxyethanol 508.5
    propionic acid 545.78
    o-xylene 214.55
    formic acid 115.25
    diethyl ether 1066.42
    m-xylene 244.27
    p-xylene 203.51
    chlorobenzene 322.64
    dimethyl carbonate 164.41
    n-octane 176.95
    formamide 125.48
    cyclopentanone 861.9
    2-pentanone 665.03
    anisole 310.04
    cyclopentyl methyl ether 920.14
    gamma-butyrolactone 675.07
    1-methoxy-2-propanol 723.03
    pyridine 671.47
    3-pentanone 498.8
    furfural 450.43
    n-dodecane 105.27
    diethylene glycol 623.19
    diisopropyl ether 391.21
    tert-amyl alcohol 650.49
    acetylacetone 464.24
    n-hexadecane 112.67
    acetophenone 209.42
    methyl propionate 436.46
    isopentyl acetate 573.02
    trichloroethylene 777.8
    n-nonanol 322.9
    cyclohexanol 685.05
    benzyl alcohol 227.07
    2-ethylhexanol 769.76
    isooctanol 288.88
    dipropyl ether 1199.59
    1,2-dichlorobenzene 227.8
    ethyl lactate 172.21
    propylene carbonate 392.33
    n-methylformamide 268.33
    2-pentanol 671.63
    n-pentane 582.95
    1-propoxy-2-propanol 1090.71
    1-methoxy-2-propyl acetate 580.36
    2-(2-methoxypropoxy) propanol 423.28
    mesitylene 166.18
    ε-caprolactone 540.32
    p-cymene 232.25
    epichlorohydrin 669.11
    1,1,1-trichloroethane 602.37
    2-aminoethanol 387.13
    morpholine-4-carbaldehyde 589.84
    sulfolane 692.47
    2,2,4-trimethylpentane 171.68
    2-methyltetrahydrofuran 1254.79
    n-hexyl acetate 409.73
    isooctane 166.62
    2-(2-butoxyethoxy)ethanol 627.0
    sec-butyl acetate 265.42
    tert-butyl acetate 392.95
    decalin 185.92
    glycerin 391.27
    diglyme 880.07
    acrylic acid 390.43
    isopropyl myristate 212.32
    n-butyric acid 698.54
    acetyl acetate 339.21
    di(2-ethylhexyl) phthalate 158.14
    ethyl propionate 334.12
    nitromethane 504.4
    1,2-diethoxyethane 723.7
    benzonitrile 251.73
    trioctyl phosphate 133.64
    1-bromopropane 701.57
    gamma-valerolactone 731.84
    n-decanol 258.48
    triethyl phosphate 170.42
    4-methyl-2-pentanol 339.15
    propionitrile 457.97
    vinylene carbonate 281.3
    1,1,2-trichlorotrifluoroethane 544.23
    DMS 231.8
    cumene 136.68
    2-octanol 233.97
    2-hexanone 475.77
    octyl acetate 255.08
    limonene 462.07
    1,2-dimethoxyethane 698.94
    ethyl orthosilicate 192.93
    tributyl phosphate 158.91
    diacetone alcohol 441.12
    N,N-dimethylaniline 209.52
    acrylonitrile 383.87
    aniline 375.76
    1,3-propanediol 469.87
    bromobenzene 360.5
    dibromomethane 775.91
    1,1,2,2-tetrachloroethane 685.0
    2-methyl-cyclohexyl acetate 319.68
    tetrabutyl urea 202.61
    diisobutyl methanol 388.02
    2-phenylethanol 356.8
    styrene 243.99
    dioctyl adipate 251.34
    dimethyl sulfate 178.23
    ethyl butyrate 510.33
    methyl lactate 233.33
    butyl lactate 231.31
    diethyl carbonate 261.99
    propanediol butyl ether 427.6
    triethyl orthoformate 352.84
    p-tert-butyltoluene 233.04
    methyl 4-tert-butylbenzoate 233.89
    morpholine 1194.94
    tert-butylamine 703.08
    n-dodecanol 224.8
    dimethoxymethane 530.91
    ethylene carbonate 266.43
    cyrene 234.87
    2-ethoxyethyl acetate 313.07
    2-ethylhexyl acetate 489.17
    1,2,4-trichlorobenzene 272.46
    4-methylpyridine 486.74
    dibutyl ether 582.51
    2,6-dimethyl-4-heptanol 388.02
    DEF 507.29
    dimethyl isosorbide 477.42
    tetrachloroethylene 479.11
    eugenol 226.1
    triacetin 316.98
    span 80 468.11
    1,4-butanediol 217.33
    1,1-dichloroethane 660.94
    2-methyl-1-pentanol 414.99
    methyl formate 181.22
    2-methyl-1-butanol 579.39
    n-decane 175.24
    butyronitrile 519.1
    3,7-dimethyl-1-octanol 402.62
    1-chlorooctane 304.14
    1-chlorotetradecane 138.04
    n-nonane 206.77
    undecane 126.98
    tert-butylcyclohexane 173.49
    cyclooctane 285.87
    cyclopentanol 717.2
    tetrahydropyran 1399.44
    tert-amyl methyl ether 559.83
    2,5,8-trioxanonane 625.17
    1-hexene 851.89
    2-isopropoxyethanol 410.63
    2,2,2-trifluoroethanol 144.15
    methyl butyrate 365.35

    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