Bis(tributyltin) oxide

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  • Identifiers

    CAS number
    56-35-9

    Molecular formula
    C24H54OSn2

    SMILES
    CCCC[Sn](CCCC)(CCCC)O[Sn](CCCC)(CCCC)CCCC

    Safety labels

    Acute Toxic
    Acute Toxic

    Irritant
    Irritant

    Health Hazard
    Health

    Environmental Hazard
    Environmental

  • Odor profile

    Fragrance
    Oily 45.42%
    Floral 40.48%
    Green 36.81%
    Fruity 36.41%
    Herbal 33.98%
    Fresh 32.6%
    Waxy 32.57%
    Sweet 30.35%
    Fatty 29.72%
    Woody 29.46%

     

    Flavor
    Waxy 30.3%
    Mild 28.77%
    Herbal 24.75%
    Delicate 22.94%
    Slightly waxy 21.73%
    Bland 21.56%
    Leathery 21.55%
    Oily 21.44%
    Fresh 21.3%
    Clean cloth 21.25%

     

  • Properties

    pKa est.
    5.65 (weak acid)

    Molecular weight
    596.1 g/mol

    Melting point expt.

    • 45 °C

    Boiling point

    • 356 °F at 2 mmHg (NTP, 1992)
    • 180 °C at 2 mm Hg.
    • 180 °C

    Flash point

    • 177.31 ˚C est.
    • greater than 200 °F (NTP, 1992)
    • >212 °F (100 °C) (closed cup)
    • 190 °C c.c.

    Solubility expt.

    • less than 1 mg/mL at 70.7 °F (NTP, 1992)
    • 0.1% in hot water.
    • Less than 20 ppm in water at 20 °C.
    • Miscible with organic solvents.
    • Water solubility of 4 mg/l at pH 7.0 and 20 °C.
    • The solubility of bis(tributyltin) oxide in water ranges from <1 to >100 mg/liter, depending on temperature and pH. Bis(tributyltin) oxide is soluble in lipids and very soluble in a number of organic solvents (e.g., ethanol, ether, halogenated hydrocarbons).
    • Solubility in water, mg/l at 20 °C: 71.2 (poor)

  • Synonyms

    • Tributyltin oxide
    • 56-35-9
    • BIS(TRIBUTYLTIN) OXIDE
    • Hexabutyldistannoxane
    • Bis(tributyltin)oxide
    • Butinox
    • Distannoxane, hexabutyl-
    • Bis(tri-n-butyltin) oxide
    • Stannicide A
    • Lastanox Q
    • Lastanox T
    • Biomet TBTO
    • Mykolastanox F
    • Biomet 66
    • Lastanox F
    • Bis(tri-n-butyltin)oxide
    • BioMeT SRM
    • Oxybis(tributylstannane)
    • Bis(tributylstannyl)oxide
    • Lastanox T 20
    • Tin, oxybis(tributyl-
    • Vikol AF-25
    • Vikol LO-25
    • C-Sn-9
    • oxybis(tributyl tin)
    • Hexabutyl distannoxane
    • Oxyde de tributyletain
    • bis(tributyl tin)oxide
    • Hexabutyldistannioxan
    • Oxybis(tributyltin)
    • Bis(tributyloxide) of tin
    • Bis-(tri-n-butylcin)oxid
    • Bis(tri-N-butylzinn)-oxyd
    • Bis(tributylstannium) oxide
    • Caswell No. 101
    • Kyslicnik tri-N-butylcinicity
    • Tin, bis(tributyl)-, oxide
    • Stannane, tri-N-butyl-, oxide
    • ENT 24,979
    • Oxybis[tributyltin]
    • Hexabutyldistannioxan [Czech]
    • L.S. 3394
    • NSC 22332
    • Tributyltin(IV) oxide
    • CCRIS 3697
    • HSDB 6505
    • Bis-(tri-n-butylcin)oxid [Czech]
    • Bis(tri-n-butylzinn)-oxyd [German]
    • EINECS 200-268-0
    • Tributyl tin oxide
    • Kyslicnik tri-n-butylcinicity [Czech]
    • EPA Pesticide Chemical Code 083001
    • Bis[tri-n-butyltin(IV)]oxide
    • DTXSID9020166
    • ZK 21995
    • 6-Oxa-5,7-distannaundecane, 5,5,7,7-tetrabutyl-
    • AI3-24979
    • 3353Q84MKM
    • NSC-22332
    • tributyl[(tributylstannyl)oxy]stannane
    • DTXCID10166
    • Distannoxane, 1,1,1,3,3,3-hexabutyl-
    • TRIBUTYLTIN OXIDE [HSDB]
    • EC 200-268-0
    • Oxybis[tributylstannane]
    • Bis(tri-n-butyltin(IV))oxide
    • BTBTO
    • Bis-(tri-n-butylcin)oxid (Czech)
    • Bis(tri-n-butylzinn)-oxyd (German)
    • tributyl((tributylstannyl)oxy)stannane
    • Kyslicnik Tri-n-butylcinicity (Czech)
    • STANNICIDE O
    • Tributyltin oxide (TBTO)
    • 1,1,1,3,3,3-Hexabutyldistannoxane
    • BIS(TRI-n-BUTYL TIN)OXIDE
    • BIS(TRIBUTYLSTANNYL) ETHER
    • BIS(TRIBUTYLSTANNYL) OXIDE
    • UN3020
    • DIALL
    • Bis(trinbutylcin)oxid
    • Tin, oxybis(tributyl
    • Vikol AF25
    • Vikol LO25
    • Bis(trinbutylzinn)oxyd
    • LASTANOX SUPER
    • ACETO TBTO
    • Distannoxane, hexabutyl
    • LASTANOX Q1
    • RefChem:569298
    • INTERCIDE 340A
    • Kyslicnik trinbutylcinicity
    • HEXABUTYLDITIN OXIDE
    • Stannane, trinbutyl, oxide
    • Tin, bis(tributyl), oxide
    • VIKOL AF 25
    • VIKOL LO 25
    • MT 1E
    • DI-TRIBUTYL TIN OXIDE
    • BIS(TRIBUTLOXIDE) of TIN
    • TRI-N-BUTYLSTANNANE OXIDE
    • BIS(TRIBUTYLSTANNIC OXIDE)
    • TRI-n-BUTYL-STANNANE OXIDE
    • ENT-24,979
    • Distannoxane, 1,1,1,3,3,3hexabutyl
    • 6Oxa5,7distannaundecane, 5,5,7,7tetrabutyl
    • 200-268-0
    • Hexabutylditin
    • Tri-n-butyltin oxide
    • TBTO
    • Biomet
    • OTBE
    • tributyl(tributylstannyloxy)stannane
    • MFCD00009418
    • Bis(tri-n-butyltin)oxide, technical grade
    • Stannane, oxide
    • Bis(tributyltin oxide)
    • HBD
    • OTBE [French]
    • 6-Oxa-5, 5,5,7,7-tetrabutyl-
    • Bis(tributyltin) Oxide (Technical Grade)
    • TBOT
    • WLN: 4-SN-4&4&O-SN-4&4&4
    • tributyltinoxide
    • UNII-3353Q84MKM
    • tributyltin hydrate
    • hexabutyidistannoxane
    • (nBu3Sn)2O
    • 56-35-9

  • Applications

    Bis(tributyltin) oxide (CAS 56-35-9) is used in several industrial applications as a tin-based processing aid and biocide. In the polymer and coatings sectors, it functions as a catalyst for polyurethane and polyester cure, and also acts as a processing stabilizer for plastics such as PVC during manufacture. It has historically served as an antifouling agent in marine paints and coatings to deter biofouling organisms. As an intermediate or precursor, it participates in the synthesis of other organotin compounds, and its use is typically evaluated under regulatory and formulation limits due to environmental and toxicity concerns.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 919.41
    methanol 425.56
    isopropanol 1162.35
    water 0.72
    ethyl acetate 2999.17
    n-propanol 1379.47
    acetone 2329.27
    n-butanol 1558.52
    acetonitrile 718.97
    DMF 3661.51
    toluene 3264.99
    isobutanol 1388.03
    1,4-dioxane 4231.61
    methyl acetate 1910.1
    THF 8269.45
    2-butanone 2905.9
    n-pentanol 1443.68
    sec-butanol 1619.5
    n-hexane 1766.48
    ethylene glycol 105.3
    NMP 6911.04
    cyclohexane 3966.98
    DMSO 2290.25
    n-butyl acetate 3980.67
    n-octanol 1970.39
    chloroform 6531.79
    n-propyl acetate 2917.83
    acetic acid 963.44
    dichloromethane 5216.05
    cyclohexanone 8023.3
    propylene glycol 301.3
    isopropyl acetate 3185.7
    DMAc 4417.53
    2-ethoxyethanol 1420.96
    isopentanol 1668.09
    n-heptane 2091.94
    ethyl formate 1434.96
    1,2-dichloroethane 4096.41
    n-hexanol 1970.23
    2-methoxyethanol 1537.54
    isobutyl acetate 2549.58
    tetrachloromethane 2008.96
    n-pentyl acetate 4970.44
    transcutol 3603.19
    n-heptanol 1837.3
    ethylbenzene 1959.91
    MIBK 2982.48
    2-propoxyethanol 2066.82
    tert-butanol 1605.4
    MTBE 3200.2
    2-butoxyethanol 2426.2
    propionic acid 1184.82
    o-xylene 2285.06
    formic acid 159.99
    diethyl ether 3146.86
    m-xylene 2582.74
    p-xylene 2644.61
    chlorobenzene 3556.09
    dimethyl carbonate 1183.0
    n-octane 1139.3
    formamide 312.07
    cyclopentanone 6855.5
    2-pentanone 3438.63
    anisole 2611.55
    cyclopentyl methyl ether 6902.53
    gamma-butyrolactone 5609.25
    1-methoxy-2-propanol 1827.81
    pyridine 4004.9
    3-pentanone 2994.89
    furfural 3717.35
    n-dodecane 581.29
    diethylene glycol 689.09
    diisopropyl ether 2248.79
    tert-amyl alcohol 1971.41
    acetylacetone 3612.97
    n-hexadecane 671.71
    acetophenone 2706.43
    methyl propionate 2430.95
    isopentyl acetate 3940.25
    trichloroethylene 6434.61
    n-nonanol 1854.72
    cyclohexanol 3232.14
    benzyl alcohol 1523.32
    2-ethylhexanol 2124.63
    isooctanol 1892.3
    dipropyl ether 3877.47
    1,2-dichlorobenzene 3506.71
    ethyl lactate 1014.88
    propylene carbonate 3942.43
    n-methylformamide 1103.59
    2-pentanol 1671.76
    n-pentane 1511.48
    1-propoxy-2-propanol 2486.77
    1-methoxy-2-propyl acetate 3268.5
    2-(2-methoxypropoxy) propanol 1499.59
    mesitylene 2120.94
    ε-caprolactone 6854.71
    p-cymene 1703.2
    epichlorohydrin 5457.99
    1,1,1-trichloroethane 5210.09
    2-aminoethanol 353.4
    morpholine-4-carbaldehyde 4840.87
    sulfolane 6953.94
    2,2,4-trimethylpentane 1052.19
    2-methyltetrahydrofuran 6753.22
    n-hexyl acetate 4884.38
    isooctane 890.7
    2-(2-butoxyethoxy)ethanol 2140.73
    sec-butyl acetate 2747.66
    tert-butyl acetate 3911.63
    decalin 1675.98
    glycerin 352.03
    diglyme 4587.86
    acrylic acid 769.75
    isopropyl myristate 2060.67
    n-butyric acid 2495.5
    acetyl acetate 2088.41
    di(2-ethylhexyl) phthalate 1273.65
    ethyl propionate 2695.51
    nitromethane 1711.31
    1,2-diethoxyethane 3598.73
    benzonitrile 2251.6
    trioctyl phosphate 1292.27
    1-bromopropane 3756.44
    gamma-valerolactone 7748.17
    n-decanol 1297.27
    triethyl phosphate 1700.98
    4-methyl-2-pentanol 1330.96
    propionitrile 1221.77
    vinylene carbonate 2948.23
    1,1,2-trichlorotrifluoroethane 2810.6
    DMS 2231.79
    cumene 1479.33
    2-octanol 1971.92
    2-hexanone 2981.02
    octyl acetate 2311.41
    limonene 3127.77
    1,2-dimethoxyethane 3433.2
    ethyl orthosilicate 1991.93
    tributyl phosphate 1475.05
    diacetone alcohol 2482.27
    N,N-dimethylaniline 2336.49
    acrylonitrile 1013.05
    aniline 2077.39
    1,3-propanediol 732.66
    bromobenzene 4629.15
    dibromomethane 4467.07
    1,1,2,2-tetrachloroethane 6505.44
    2-methyl-cyclohexyl acetate 3142.81
    tetrabutyl urea 2227.48
    diisobutyl methanol 1702.38
    2-phenylethanol 1680.67
    styrene 2275.64
    dioctyl adipate 2270.58
    dimethyl sulfate 1843.7
    ethyl butyrate 3452.92
    methyl lactate 938.29
    butyl lactate 2635.47
    diethyl carbonate 1929.7
    propanediol butyl ether 1689.44
    triethyl orthoformate 3229.47
    p-tert-butyltoluene 1738.68
    methyl 4-tert-butylbenzoate 2643.42
    morpholine 4865.85
    tert-butylamine 1534.13
    n-dodecanol 1002.17
    dimethoxymethane 2835.37
    ethylene carbonate 3125.44
    cyrene 1858.87
    2-ethoxyethyl acetate 4193.54
    2-ethylhexyl acetate 3954.07
    1,2,4-trichlorobenzene 3832.86
    4-methylpyridine 4784.1
    dibutyl ether 3693.85
    2,6-dimethyl-4-heptanol 1702.38
    DEF 4463.34
    dimethyl isosorbide 3410.3
    tetrachloroethylene 3904.38
    eugenol 1988.92
    triacetin 3135.89
    span 80 1976.2
    1,4-butanediol 417.3
    1,1-dichloroethane 3885.48
    2-methyl-1-pentanol 1558.3
    methyl formate 868.46
    2-methyl-1-butanol 1707.92
    n-decane 1158.45
    butyronitrile 1824.42
    3,7-dimethyl-1-octanol 1890.53
    1-chlorooctane 2656.65
    1-chlorotetradecane 1035.16
    n-nonane 1240.22
    undecane 764.69
    tert-butylcyclohexane 1374.99
    cyclooctane 2222.32
    cyclopentanol 2792.53
    tetrahydropyran 6671.25
    tert-amyl methyl ether 3292.69
    2,5,8-trioxanonane 2484.63
    1-hexene 2450.52
    2-isopropoxyethanol 1365.82
    2,2,2-trifluoroethanol 468.5
    methyl butyrate 3326.49

    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