Phosphorus pentoxide

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  • Identifiers

    CAS number
    1314-56-3

    Molecular formula
    O5P2

    SMILES
    O=P(=O)OP(=O)=O

    Safety labels

  • Odor profile

    Fragrance
    Odorless 85.28%
    Sour 30.06%
    Burnt 22.79%
    Sharp 21.34%
    Pungent 17.41%
    Winey 17.29%
    Clean 16.26%
    Ethereal 15.36%
    Caramellic 14.06%
    Bitter 10.85%

     

    Flavor
    Odorless 55.72%
    Sour 35.84%
    Vinegar 26.73%
    Sharp 23.66%
    Caramellic 22.52%
    Formyl 22.28%
    Very mild 20.81%
    Urine 19.88%
    Mousy 19.81%
    Soy 19.43%

     

    Odor impact est.
    Low

  • Properties

    XLogP3-AA
    -2.1

    pKa est.
    2.9 (strong acid)

    Molecular weight
    141.94 g/mol

    Flash point

    • 112.92 ˚C est.

  • Synonyms

    • PHOSPHORUS PENTOXIDE
    • 1314-56-3
    • Phosphorus(V) oxide
    • diphosphonate
    • Phosphorus (V) pentoxide
    • diphosphonate(2-)
    • Phosphorus oxide (P2O5)
    • MFCD00011440
    • O5P2
    • Diphosphorpentaoxid
    • SCHEMBL196558
    • CHEBI:29262
    • YWEUIGNSBFLMFL-UHFFFAOYSA-N
    • AKOS015903585
    • P2H2O5(2-)
    • BP-21050
    • mu-oxido-bis(hydridodioxidophosphate)(2-)
    • [O2P(H)OP(H)(O)2](2-)
    • NS00080965
    • P1746
    • A851563
    • F044747
    • Q27109994
    • 337913-25-4
    • 72906-42-4
    • 1314-56-3

  • Applications

    Phosphorus pentoxide (CAS 1314-56-3) is a strong dehydrating agent with broad industrial use. It is widely employed as a desiccant to dry solvents, reaction media, and gas streams in chemical manufacturing and electronics fabrication. In organic synthesis it acts as a dehydration reagent, enabling formation of phosphate esters and other organophosphorus intermediates. It serves as a feedstock and precursor for producing phosphoric acid and related phosphate derivatives used in fertilizers, flame retardants, and specialty polymers. In polymer and coating chemistry it is used to drive condensation reactions by removing water, helping to form polyphosphates and phosphorus-containing linkages.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 702.82
    methanol 1072.98
    isopropanol 582.96
    water 668.25
    ethyl acetate 190.08
    n-propanol 434.06
    acetone 448.93
    n-butanol 366.62
    acetonitrile 261.4
    DMF 1185.76
    toluene 64.51
    isobutanol 292.04
    1,4-dioxane 401.61
    methyl acetate 212.86
    THF 955.4
    2-butanone 261.29
    n-pentanol 222.83
    sec-butanol 378.68
    n-hexane 50.99
    ethylene glycol 419.82
    NMP 537.22
    cyclohexane 37.89
    DMSO 1101.23
    n-butyl acetate 80.97
    n-octanol 113.78
    chloroform 160.7
    n-propyl acetate 119.18
    acetic acid 202.47
    dichloromethane 179.56
    cyclohexanone 161.06
    propylene glycol 398.5
    isopropyl acetate 143.61
    DMAc 808.98
    2-ethoxyethanol 476.58
    isopentanol 254.98
    n-heptane 38.8
    ethyl formate 181.81
    1,2-dichloroethane 151.65
    n-hexanol 178.24
    2-methoxyethanol 970.55
    isobutyl acetate 70.58
    tetrachloromethane 65.88
    n-pentyl acetate 71.76
    transcutol 244.52
    n-heptanol 124.33
    ethylbenzene 44.31
    MIBK 171.44
    2-propoxyethanol 415.02
    tert-butanol 575.65
    MTBE 287.17
    2-butoxyethanol 240.39
    propionic acid 192.19
    o-xylene 66.61
    formic acid 295.65
    diethyl ether 382.98
    m-xylene 64.31
    p-xylene 49.76
    chlorobenzene 39.83
    dimethyl carbonate 243.99
    n-octane 20.63
    formamide 505.92
    cyclopentanone 315.8
    2-pentanone 256.68
    anisole 128.89
    cyclopentyl methyl ether 343.98
    gamma-butyrolactone 313.76
    1-methoxy-2-propanol 758.46
    pyridine 146.29
    3-pentanone 199.11
    furfural 215.77
    n-dodecane 16.88
    diethylene glycol 421.77
    diisopropyl ether 124.16
    tert-amyl alcohol 389.49
    acetylacetone 195.03
    n-hexadecane 17.27
    acetophenone 96.29
    methyl propionate 261.96
    isopentyl acetate 63.08
    trichloroethylene 120.21
    n-nonanol 102.66
    cyclohexanol 198.16
    benzyl alcohol 108.97
    2-ethylhexanol 83.61
    isooctanol 87.89
    dipropyl ether 157.47
    1,2-dichlorobenzene 39.64
    ethyl lactate 136.89
    propylene carbonate 150.65
    n-methylformamide 577.81
    2-pentanol 288.56
    n-pentane 80.94
    1-propoxy-2-propanol 254.68
    1-methoxy-2-propyl acetate 131.17
    2-(2-methoxypropoxy) propanol 160.33
    mesitylene 51.29
    ε-caprolactone 140.74
    p-cymene 37.46
    epichlorohydrin 342.0
    1,1,1-trichloroethane 100.44
    2-aminoethanol 525.98
    morpholine-4-carbaldehyde 430.7
    sulfolane 382.21
    2,2,4-trimethylpentane 30.22
    2-methyltetrahydrofuran 388.95
    n-hexyl acetate 85.4
    isooctane 26.54
    2-(2-butoxyethoxy)ethanol 195.04
    sec-butyl acetate 84.01
    tert-butyl acetate 154.43
    decalin 20.87
    glycerin 531.63
    diglyme 298.26
    acrylic acid 162.15
    isopropyl myristate 54.19
    n-butyric acid 177.74
    acetyl acetate 88.03
    di(2-ethylhexyl) phthalate 45.73
    ethyl propionate 146.37
    nitromethane 329.3
    1,2-diethoxyethane 121.2
    benzonitrile 68.18
    trioctyl phosphate 52.74
    1-bromopropane 126.52
    gamma-valerolactone 318.83
    n-decanol 83.07
    triethyl phosphate 64.05
    4-methyl-2-pentanol 160.86
    propionitrile 191.69
    vinylene carbonate 114.04
    1,1,2-trichlorotrifluoroethane 243.17
    DMS 73.96
    cumene 42.03
    2-octanol 92.68
    2-hexanone 143.32
    octyl acetate 69.49
    limonene 49.9
    1,2-dimethoxyethane 557.65
    ethyl orthosilicate 65.55
    tributyl phosphate 47.82
    diacetone alcohol 255.01
    N,N-dimethylaniline 140.34
    acrylonitrile 200.55
    aniline 132.26
    1,3-propanediol 509.02
    bromobenzene 28.96
    dibromomethane 133.6
    1,1,2,2-tetrachloroethane 147.64
    2-methyl-cyclohexyl acetate 66.74
    tetrabutyl urea 79.1
    diisobutyl methanol 63.35
    2-phenylethanol 95.29
    styrene 44.2
    dioctyl adipate 65.75
    dimethyl sulfate 319.92
    ethyl butyrate 86.77
    methyl lactate 265.34
    butyl lactate 82.47
    diethyl carbonate 65.98
    propanediol butyl ether 179.56
    triethyl orthoformate 79.48
    p-tert-butyltoluene 42.56
    methyl 4-tert-butylbenzoate 113.19
    morpholine 514.75
    tert-butylamine 379.99
    n-dodecanol 68.32
    dimethoxymethane 977.87
    ethylene carbonate 117.38
    cyrene 183.83
    2-ethoxyethyl acetate 83.76
    2-ethylhexyl acetate 52.04
    1,2,4-trichlorobenzene 46.2
    4-methylpyridine 147.96
    dibutyl ether 75.11
    2,6-dimethyl-4-heptanol 63.35
    DEF 325.77
    dimethyl isosorbide 207.51
    tetrachloroethylene 104.37
    eugenol 134.22
    triacetin 77.21
    span 80 120.9
    1,4-butanediol 220.01
    1,1-dichloroethane 141.13
    2-methyl-1-pentanol 151.67
    methyl formate 362.49
    2-methyl-1-butanol 249.32
    n-decane 24.1
    butyronitrile 177.3
    3,7-dimethyl-1-octanol 76.87
    1-chlorooctane 50.4
    1-chlorotetradecane 28.13
    n-nonane 24.23
    undecane 19.78
    tert-butylcyclohexane 24.89
    cyclooctane 21.96
    cyclopentanol 318.21
    tetrahydropyran 294.73
    tert-amyl methyl ether 259.5
    2,5,8-trioxanonane 230.86
    1-hexene 94.97
    2-isopropoxyethanol 302.07
    2,2,2-trifluoroethanol 186.69
    methyl butyrate 153.92

    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