Dimethyldichlorosilane

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  • Identifiers

    CAS number
    75-78-5

    Molecular formula
    C2H6Cl2Si

    SMILES
    C[Si](C)(Cl)Cl

    Safety labels

    Flammable
    Flammable

    Irritant
    Irritant

  • Odor profile

    Fragrance
    Fishy 39.53%
    Odorless 32.9%
    Mint 26.13%
    Camphoreous 24.41%
    Sweet 23.05%
    Woody 22.91%
    Cheesy 20.76%
    Ripe 20.63%
    Fresh 20.57%
    Oily 19.9%

     

    Flavor
    Sulfurous 32.67%
    Meaty 29.57%
    Sulfury 24.14%
    Fishy 23.39%
    Onion 20.21%
    Glue 19.72%
    Bloody 19.69%
    Odorless 19.58%
    Bouillon 18.73%
    Rotten 18.67%

     

    Odor impact est.
    High

  • Properties

    pKa est.
    8.57 (weak base)

    Molecular weight
    129.06 g/mol

    Melting point expt.

    • -123 °F (EPA, 1998)
    • -16 °C
    • -76 °C

    Boiling point

    • 158 °F at 760 mmHg (EPA, 1998)
    • 70.3 °C
    • 71 °C

    Flash point

    • -7.96 ˚C est.
    • 16 °F (EPA, 1998)
    • -8.9 °C
    • 16 °F (-18 °C) (open cup)[Lewis RJ Sr; Hawley's Condensed Chemical Dictionary 15th ed Wiley (2007)
    • -9 °C c.c.

    Solubility expt.

    • Decomposes in water and ethanol
    • Soluble in benzene and ether
    • Solubility in water: reaction

  • Synonyms

    • Dichlorodimethylsilane
    • 75-78-5
    • DIMETHYLDICHLOROSILANE
    • Dichloro(dimethyl)silane
    • Silane, dichlorodimethyl-
    • Dichlorodimethylsilicon
    • Inerton AW-DMCS
    • Inerton dw-dmc
    • Repel-Silan
    • Dimethylsilane dichloride
    • Dimethyl-dichlorsilan
    • CCRIS 783
    • HSDB 361
    • (CH3)2SiCl2
    • EINECS 200-901-0
    • UNII-8TSJ92JX69
    • LS 130
    • NSC 77070
    • UN1162
    • Dimethyldichlorsilane
    • BRN 0605287
    • AI3-51462
    • NSC-77070
    • Silane, dichlorodimethyl-,
    • 8TSJ92JX69
    • DTXSID9026425
    • EC 200-901-0
    • 4-04-00-04111 (Beilstein Handbook Reference)
    • DIMETHYLDICHLOROSILANE [HSDB]
    • UN 1162
    • DMDCS; Dimethyldichlorsilane
    • dimethyl dichlorosilane
    • Dimethyl-dichlorsilan [Czech]
    • DMDCS
    • MFCD00000491
    • RepelSilan
    • Inerton AWDMCS
    • Inerton DWDMC
    • dichlordimethylsilan
    • dimethyldichlorsilan
    • Dimetildiclorosilano
    • Inerton AW-DMC
    • dichlorodimehylsilane
    • dimethyldichlorosilan
    • dimethyidichlorosilane
    • Me2SiCl2
    • SiMe2Cl2
    • dichloro dimethylsilane
    • dichlorodimethyl silane
    • dimethyldichloro silane
    • REPEL-SILANE
    • Dichlorodimethylsilicone
    • silane, dichlorodimethyl
    • Dichloro-dimethyl-silane
    • silane, Dichloro-dimethyl-
    • M 2 (SILANE)
    • SCHEMBL17331
    • Dichlordimethylsilan (German)
    • Dimetildiclorosilano (Spanish)
    • bis(chloranyl)-dimethyl-silane
    • Dichlorodimethylsilane, Reagent
    • DTXCID006425
    • WLN: G-SI-G1&1
    • Dichlorodimethylsilane, >=99.5%
    • NSC77070
    • AKOS008901379
    • FD46987
    • Dichlorodimethylsilane, Selectophore(TM)
    • Dichlorodimethylsilane, >=98.5% (GC)
    • LS-12940
    • D0358
    • NS00041017
    • Dimethyldichlorosilane;Dimethylsilyl dichloride
    • EN300-19447
    • A838507
    • Q416690
    • Dimethyldichlorosilane [UN1162] [Flammable liquid]
    • F0001-1905
    • Dichlorodimethylsilane, produced by Wacker Chemie AG, Burghausen, Germany, >=99.0% (GC)
    • Sylon CT(TM), for GC derivatization, pkg of 400 mL, 5% dimethyldichlorosilane in toluene
    • 200-901-0

  • Applications

    Dimethyldichlorosilane (CAS 75-78-5) is a key precursor in silicone chemistry used to synthesize polysiloxanes (notably polydimethylsiloxane) and silicone resins for elastomeric materials and protective coatings; it also functions as a silane coupling agent and surface modifier for inorganic substrates (e.g., glass and silica), enabling hydrophobic coatings and improved adhesion in coatings, adhesives, and composites; as a reactive intermediate, it enables the production of silicone fluids/oils and other organosilicon compounds for use in lubricants and specialty coatings; and it is employed in electronics-related applications for surface functionalization and as a building block for materials used in encapsulation and packaging.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 355.89
    methanol 463.45
    isopropanol 290.87
    water 44.03
    ethyl acetate 193.74
    n-propanol 287.62
    acetone 428.79
    n-butanol 261.94
    acetonitrile 197.67
    DMF 574.93
    toluene 160.88
    isobutanol 207.82
    1,4-dioxane 376.91
    methyl acetate 197.37
    THF 712.52
    2-butanone 302.71
    n-pentanol 206.88
    sec-butanol 251.36
    n-hexane 98.33
    ethylene glycol 180.01
    NMP 441.27
    cyclohexane 119.68
    DMSO 466.48
    n-butyl acetate 210.87
    n-octanol 219.7
    chloroform 318.31
    n-propyl acetate 168.68
    acetic acid 275.52
    dichloromethane 226.81
    cyclohexanone 376.57
    propylene glycol 218.82
    isopropyl acetate 158.57
    DMAc 409.43
    2-ethoxyethanol 297.07
    isopentanol 195.96
    n-heptane 126.79
    ethyl formate 164.51
    1,2-dichloroethane 191.13
    n-hexanol 294.91
    2-methoxyethanol 444.35
    isobutyl acetate 132.72
    tetrachloromethane 101.59
    n-pentyl acetate 187.06
    transcutol 481.42
    n-heptanol 213.18
    ethylbenzene 84.27
    MIBK 187.75
    2-propoxyethanol 434.73
    tert-butanol 282.58
    MTBE 207.23
    2-butoxyethanol 303.45
    propionic acid 212.19
    o-xylene 115.99
    formic acid 173.06
    diethyl ether 263.52
    m-xylene 123.82
    p-xylene 106.82
    chlorobenzene 148.35
    dimethyl carbonate 142.72
    n-octane 59.79
    formamide 205.88
    cyclopentanone 485.35
    2-pentanone 280.68
    anisole 169.05
    cyclopentyl methyl ether 353.29
    gamma-butyrolactone 381.91
    1-methoxy-2-propanol 404.47
    pyridine 259.06
    3-pentanone 223.22
    furfural 353.54
    n-dodecane 41.72
    diethylene glycol 331.92
    diisopropyl ether 120.88
    tert-amyl alcohol 223.88
    acetylacetone 276.45
    n-hexadecane 44.47
    acetophenone 157.26
    methyl propionate 203.44
    isopentyl acetate 177.3
    trichloroethylene 271.04
    n-nonanol 189.37
    cyclohexanol 265.35
    benzyl alcohol 147.79
    2-ethylhexanol 172.03
    isooctanol 152.76
    dipropyl ether 258.77
    1,2-dichlorobenzene 126.04
    ethyl lactate 127.99
    propylene carbonate 221.56
    n-methylformamide 281.26
    2-pentanol 226.27
    n-pentane 113.96
    1-propoxy-2-propanol 361.71
    1-methoxy-2-propyl acetate 222.29
    2-(2-methoxypropoxy) propanol 216.06
    mesitylene 94.8
    ε-caprolactone 276.31
    p-cymene 93.6
    epichlorohydrin 333.69
    1,1,1-trichloroethane 191.9
    2-aminoethanol 251.01
    morpholine-4-carbaldehyde 435.6
    sulfolane 454.28
    2,2,4-trimethylpentane 46.97
    2-methyltetrahydrofuran 388.41
    n-hexyl acetate 233.76
    isooctane 44.76
    2-(2-butoxyethoxy)ethanol 300.71
    sec-butyl acetate 123.32
    tert-butyl acetate 183.09
    decalin 49.27
    glycerin 295.54
    diglyme 451.36
    acrylic acid 196.24
    isopropyl myristate 120.58
    n-butyric acid 241.01
    acetyl acetate 135.82
    di(2-ethylhexyl) phthalate 108.86
    ethyl propionate 149.53
    nitromethane 305.46
    1,2-diethoxyethane 237.49
    benzonitrile 153.94
    trioctyl phosphate 98.47
    1-bromopropane 173.1
    gamma-valerolactone 497.4
    n-decanol 146.52
    triethyl phosphate 100.95
    4-methyl-2-pentanol 138.64
    propionitrile 173.4
    vinylene carbonate 195.05
    1,1,2-trichlorotrifluoroethane 275.09
    DMS 141.89
    cumene 69.15
    2-octanol 173.58
    2-hexanone 214.36
    octyl acetate 153.05
    limonene 142.39
    1,2-dimethoxyethane 399.63
    ethyl orthosilicate 107.39
    tributyl phosphate 103.67
    diacetone alcohol 238.88
    N,N-dimethylaniline 147.74
    acrylonitrile 183.73
    aniline 192.45
    1,3-propanediol 264.95
    bromobenzene 132.77
    dibromomethane 196.5
    1,1,2,2-tetrachloroethane 262.6
    2-methyl-cyclohexyl acetate 149.34
    tetrabutyl urea 153.15
    diisobutyl methanol 120.11
    2-phenylethanol 180.36
    styrene 97.45
    dioctyl adipate 146.6
    dimethyl sulfate 189.6
    ethyl butyrate 163.34
    methyl lactate 176.28
    butyl lactate 176.33
    diethyl carbonate 109.88
    propanediol butyl ether 297.01
    triethyl orthoformate 151.48
    p-tert-butyltoluene 104.18
    methyl 4-tert-butylbenzoate 194.66
    morpholine 421.61
    tert-butylamine 211.0
    n-dodecanol 121.42
    dimethoxymethane 417.03
    ethylene carbonate 169.52
    cyrene 219.58
    2-ethoxyethyl acetate 196.05
    2-ethylhexyl acetate 156.42
    1,2,4-trichlorobenzene 155.07
    4-methylpyridine 252.83
    dibutyl ether 188.59
    2,6-dimethyl-4-heptanol 120.11
    DEF 268.07
    dimethyl isosorbide 335.42
    tetrachloroethylene 198.28
    eugenol 207.16
    triacetin 208.67
    span 80 248.9
    1,4-butanediol 155.18
    1,1-dichloroethane 206.65
    2-methyl-1-pentanol 148.55
    methyl formate 224.25
    2-methyl-1-butanol 192.97
    n-decane 64.72
    butyronitrile 178.55
    3,7-dimethyl-1-octanol 159.56
    1-chlorooctane 134.31
    1-chlorotetradecane 68.06
    n-nonane 68.55
    undecane 49.75
    tert-butylcyclohexane 50.05
    cyclooctane 67.36
    cyclopentanol 303.9
    tetrahydropyran 394.0
    tert-amyl methyl ether 191.98
    2,5,8-trioxanonane 327.15
    1-hexene 158.58
    2-isopropoxyethanol 220.93
    2,2,2-trifluoroethanol 149.9
    methyl butyrate 180.06

    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