Cyclopentanes

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  • Identifiers

    CAS number
    287-92-3

    Molecular formula
    C5H10

    SMILES
    C1CCCC1

    Safety labels

    Flammable
    Flammable

  • Odor profile

    Fragrance
    Sweet 64.39%
    Musk 52.24%
    Dry 41.24%
    Amber 36.16%
    Woody 31.14%
    Animal 26.21%
    Waxy 21.06%
    Powdery 19.67%
    Clean 16.82%
    Cedar 16.56%

     

    Flavor
    Animal 28.65%
    Alkane 22.06%
    Ammoniacal 20.95%
    Shrimp 19.48%
    Alkaline 19.29%
    Rotten 18.04%
    Beet 17.79%
    Tar 17.59%
    Soil 17.48%
    Tarry 17.48%

     

    Odor impact est.
    Low

  • Properties

    XLogP3-AA
    3.0

    pKa est.
    10.19 (weak base)

    Molecular weight
    70.13 g/mol

    Vapor pressure est.

    • hPa @ 20°C
    • hPa @ 25°C

    Evaporation rate
    Ultra fast

    Melting point expt.

    • -137 °F (USCG, 1999)
    • -93.4 °C
    • -94 °C
    • -137 °F

    Boiling point

    • 120.7 °F at 760 mmHg (USCG, 1999)
    • 49.2 °C
    • 49 °C
    • 121 °F

    Flash point

    • -33.48 ˚C est.
    • less than 20 °F (USCG, 1999)
    • -37 °C
    • -20 °C (-4 °F) (Closed cup)
    • <20 °F (<-7 °C) (Closed cup)
    • -37 °C c.c.
    • <20 °F
    • -35 °F

    Solubility expt.

    • Insoluble (NIOSH, 2024)
    • In water, 156 ppm at 25 °C
    • Miscible with other hydrocarbon solvents, alcohol, ether
    • Miscible with ethanol, ethyl ether, acetone, benzene, petroleum ether, carbon tetrachloride
    • Solubility in water: none
    • Insoluble

  • Synonyms

    • CYCLOPENTANE
    • 287-92-3
    • Pentamethylene
    • ciclopentano
    • cyclopentan
    • Zyklopentan
    • HSDB 62
    • Cyclopentanes
    • UNII-T86PB90RNU
    • EINECS 206-016-6
    • T86PB90RNU
    • NSC 60213
    • UN1146
    • DTXSID6024886
    • CHEBI:23492
    • CYCLOPENTANE [MI]
    • MFCD00001356
    • NSC-60213
    • CYCLOPENTANE [HSDB]
    • DTXCID804886
    • EC 206-016-6
    • UN 1146
    • trans-cyclopentane
    • EINECS 270-696-0
    • ZEONSOLV HP
    • Cyclopentane (ACGIH)
    • Cyclopentane, HPLC Grade
    • WLN: L5TJ
    • CHEMBL1370850
    • CHEBI:23493
    • Cyclopentane (ZEONSOLVaa? HP)
    • Cyclopentane, analytical standard
    • DTXSID20192138
    • Cyclopentane, reagent grade, 98%
    • NSC60213
    • Tox21_200202
    • AKOS015903084
    • NCGC00091776-01
    • NCGC00091776-02
    • NCGC00257756-01
    • CAS-287-92-3
    • PS-11988
    • DB-360220
    • Cyclopentane [UN1146] [Flammable liquid]
    • NS00004654
    • Q80260
    • Cyclopentane, for HPLC, >=75% cyclopentane basis
    • ASTM Method D5191 Vapor Pressure - 68.3kPa (9.91 psi)
    • Cyclopentane, >=75% cyclopentane basis, spectrophotometric grade
    • 206-016-6

  • Applications

    Cyclopentanes (CAS 287-92-3) are primarily used as blowing agents for polyurethane foams used in insulation and appliance casings, and as nonpolar solvents in industrial cleaning and processing. They also serve as a feedstock for the synthesis of cyclopentyl-containing compounds, including dehydrogenation to cyclopentene and various cyclopentyl derivatives. Additionally, they are used as processing solvents in certain coatings and adhesives systems with nonpolar resins. Because of their volatility and flammability, use is controlled by applicable local regulations and formulation limits.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 347.25
    methanol 262.43
    isopropanol 348.77
    water 0.18
    ethyl acetate 434.2
    n-propanol 391.51
    acetone 496.64
    n-butanol 461.79
    acetonitrile 246.58
    DMF 327.04
    toluene 319.56
    isobutanol 303.37
    1,4-dioxane 689.24
    methyl acetate 335.24
    THF 1466.63
    2-butanone 458.93
    n-pentanol 282.25
    sec-butanol 380.42
    n-hexane 552.44
    ethylene glycol 86.93
    NMP 527.93
    cyclohexane 772.09
    DMSO 414.81
    n-butyl acetate 752.61
    n-octanol 264.52
    chloroform 1223.19
    n-propyl acetate 296.44
    acetic acid 396.6
    dichloromethane 800.23
    cyclohexanone 733.99
    propylene glycol 171.81
    isopropyl acetate 314.04
    DMAc 279.61
    2-ethoxyethanol 236.28
    isopentanol 363.36
    n-heptane 993.12
    ethyl formate 192.23
    1,2-dichloroethane 498.32
    n-hexanol 702.33
    2-methoxyethanol 382.72
    isobutyl acetate 223.1
    tetrachloromethane 329.12
    n-pentyl acetate 282.92
    transcutol 790.04
    n-heptanol 277.36
    ethylbenzene 183.97
    MIBK 262.37
    2-propoxyethanol 641.61
    tert-butanol 458.39
    MTBE 469.48
    2-butoxyethanol 344.99
    propionic acid 367.81
    o-xylene 194.12
    formic acid 61.17
    diethyl ether 634.07
    m-xylene 204.22
    p-xylene 216.67
    chlorobenzene 334.44
    dimethyl carbonate 116.71
    n-octane 226.19
    formamide 68.01
    cyclopentanone 891.56
    2-pentanone 458.91
    anisole 235.67
    cyclopentyl methyl ether 796.96
    gamma-butyrolactone 756.68
    1-methoxy-2-propanol 382.64
    pyridine 583.43
    3-pentanone 383.74
    furfural 452.82
    n-dodecane 120.44
    diethylene glycol 309.16
    diisopropyl ether 289.85
    tert-amyl alcohol 400.29
    acetylacetone 367.72
    n-hexadecane 133.66
    acetophenone 186.34
    methyl propionate 309.87
    isopentyl acetate 534.43
    trichloroethylene 802.93
    n-nonanol 251.89
    cyclohexanol 535.83
    benzyl alcohol 161.5
    2-ethylhexanol 601.57
    isooctanol 228.82
    dipropyl ether 1171.92
    1,2-dichlorobenzene 265.0
    ethyl lactate 136.97
    propylene carbonate 462.98
    n-methylformamide 149.87
    2-pentanol 391.52
    n-pentane 458.59
    1-propoxy-2-propanol 771.08
    1-methoxy-2-propyl acetate 457.97
    2-(2-methoxypropoxy) propanol 285.53
    mesitylene 153.05
    ε-caprolactone 547.08
    p-cymene 245.83
    epichlorohydrin 589.49
    1,1,1-trichloroethane 667.03
    2-aminoethanol 179.79
    morpholine-4-carbaldehyde 399.63
    sulfolane 768.98
    2,2,4-trimethylpentane 156.33
    2-methyltetrahydrofuran 1010.01
    n-hexyl acetate 379.66
    isooctane 136.67
    2-(2-butoxyethoxy)ethanol 404.61
    sec-butyl acetate 226.84
    tert-butyl acetate 338.21
    decalin 218.83
    glycerin 194.56
    diglyme 630.24
    acrylic acid 282.63
    isopropyl myristate 219.61
    n-butyric acid 539.06
    acetyl acetate 296.49
    di(2-ethylhexyl) phthalate 137.92
    ethyl propionate 283.25
    nitromethane 331.22
    1,2-diethoxyethane 521.2
    benzonitrile 218.58
    trioctyl phosphate 130.78
    1-bromopropane 652.55
    gamma-valerolactone 630.56
    n-decanol 203.54
    triethyl phosphate 193.77
    4-methyl-2-pentanol 221.66
    propionitrile 313.22
    vinylene carbonate 310.13
    1,1,2-trichlorotrifluoroethane 492.71
    DMS 194.41
    cumene 134.77
    2-octanol 188.66
    2-hexanone 342.39
    octyl acetate 243.25
    limonene 494.91
    1,2-dimethoxyethane 426.26
    ethyl orthosilicate 213.16
    tributyl phosphate 162.13
    diacetone alcohol 323.99
    N,N-dimethylaniline 168.47
    acrylonitrile 277.21
    aniline 273.32
    1,3-propanediol 236.0
    bromobenzene 392.53
    dibromomethane 762.45
    1,1,2,2-tetrachloroethane 752.32
    2-methyl-cyclohexyl acetate 342.33
    tetrabutyl urea 200.61
    diisobutyl methanol 356.2
    2-phenylethanol 253.2
    styrene 219.38
    dioctyl adipate 255.32
    dimethyl sulfate 147.31
    ethyl butyrate 523.5
    methyl lactate 164.49
    butyl lactate 230.52
    diethyl carbonate 282.93
    propanediol butyl ether 269.27
    triethyl orthoformate 396.9
    p-tert-butyltoluene 246.9
    methyl 4-tert-butylbenzoate 233.09
    morpholine 784.27
    tert-butylamine 444.43
    n-dodecanol 178.81
    dimethoxymethane 293.76
    ethylene carbonate 286.51
    cyrene 187.98
    2-ethoxyethyl acetate 254.49
    2-ethylhexyl acetate 471.36
    1,2,4-trichlorobenzene 312.45
    4-methylpyridine 412.28
    dibutyl ether 598.61
    2,6-dimethyl-4-heptanol 356.2
    DEF 381.83
    dimethyl isosorbide 411.78
    tetrachloroethylene 541.81
    eugenol 193.09
    triacetin 276.59
    span 80 382.96
    1,4-butanediol 98.78
    1,1-dichloroethane 603.06
    2-methyl-1-pentanol 240.85
    methyl formate 115.91
    2-methyl-1-butanol 340.51
    n-decane 209.32
    butyronitrile 387.3
    3,7-dimethyl-1-octanol 325.32
    1-chlorooctane 315.71
    1-chlorotetradecane 152.01
    n-nonane 241.5
    undecane 151.39
    tert-butylcyclohexane 191.73
    cyclooctane 338.67
    cyclopentanol 568.71
    tetrahydropyran 1076.25
    tert-amyl methyl ether 391.42
    2,5,8-trioxanonane 434.6
    1-hexene 697.59
    2-isopropoxyethanol 217.33
    2,2,2-trifluoroethanol 111.49
    methyl butyrate 325.24

    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

Botanical

Name CAS Botanical Proportion
Asafoetida (Pakistan) 2 9000-04-8 Ferula assafoetida L., fam. Apiaceae (Umbelliferae) 0.01%