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75-78-5

Basic Information
CAS No.: 75-78-5
Name: Dichlorodimethylsilane
Article Data: 220
Molecular Structure:
Molecular Structure of 75-78-5 (Dichlorodimethylsilane)
Formula: C2H6Cl2Si
Molecular Weight: 129.061
Synonyms: DCDMS;Dichlorodimethylsilicon;Dimethylsilane dichloride;Inerton AW-DMCS;KA 12;KA 22;LS 130;LS 130(silane);M 2 (silane);NSC 77070;Repel-Silane;Silane,dichlorodimethyl-;Dichlorodimethylsilane;
EINECS: 200-901-0
Density: 1.075 g/cm3
Melting Point: -76 °C
Boiling Point: 69.999 °C at 760 mmHg
Flash Point: -9 °C
Solubility: reacts with water
Appearance: Colorless to brown liquid
Hazard Symbols: HarmfulXn, IrritantXi, FlammableF, DangerousN
Risk Codes: 20-59-36/37/38-11-67-65-63-48/20-38-20/21-50/53
Safety: 60-61-62-36/37-59
Transport Information: UN 2924 3/PG 2
PSA: 0.00000
LogP: 2.16580
Synthetic route
75-76-3

tetramethylsilane

10038-98-9

germaniumtetrachloride

A

75-77-4

chloro-trimethyl-silane

B

1529-47-1

chlorotrimethylgermane

C

75-78-5

dimethylsilicon dichloride

Conditions
ConditionsYield
aluminium bromide In neat (no solvent) molar ratio Me4Si/GeCl4 = 2/1, at 200°C for 15 h, cooled; NMR, mass spectra, chromy.;A 50%
B 100%
C 50%
75-76-3

tetramethylsilane

10038-98-9

germaniumtetrachloride

A

993-10-2

methyltrichlorogermane

B

75-78-5

dimethylsilicon dichloride

C

1529-48-2

dichlorodimethylgermanium

Conditions
ConditionsYield
aluminium bromide In neat (no solvent) molar ratio Me4Si/GeCl4 = 0.5/1, at 200°C for 28 h, cooled; NMR, mass spectra, chromy.;A 64%
B 100%
C 36%
75-76-3

tetramethylsilane

10038-98-9

germaniumtetrachloride

A

1529-47-1

chlorotrimethylgermane

B

75-78-5

dimethylsilicon dichloride

C

1529-48-2

dichlorodimethylgermanium

Conditions
ConditionsYield
aluminium bromide In neat (no solvent) molar ratio Me4Si/GeCl4 = 1/1, at 200°C for 56 h, cooled; NMR, mass spectra, chromy.;A 14%
B 100%
C 86%
676-97-1

methylphosphonic acid dichloroanhydride

23272-12-0

methoxydimethylsilyl cyanide

A

101153-04-2

methyl (cyano)methylphosphonate

B

75-78-5

dimethylsilicon dichloride

Conditions
ConditionsYield
at 40 - 45℃; for 0.0833333h;A 87.6%
B 97%
7440-21-3

silicon

75-78-5

dimethylsilicon dichloride

Conditions
ConditionsYield
With methylene chloride; copper In neat (no solvent) vibrating of the Si-Cu powder;;97%
With methylene chloride; copper In neat (no solvent) CH3Cl and Si-Cu/Cu-oxide at 300-375°C;;82.4%
With methylene chloride; copper In neat (no solvent) CH3Cl and Si purified by treatment with strong acids;;
With methylene chloride In neat (no solvent)
With CH3Cl In neat (no solvent)

(C4H9)3CBCl2

1027-80-1

2,2-dimethyl-1,3-diphenyl-[1,3,2]diazasilolidine

A

75-78-5

dimethylsilicon dichloride

B

2179-98-8

2-(1,1-dibutyl-pentyl)-1,3-diphenyl-[1,3,2]diazaborolidine

Conditions
ConditionsYield
A n/a
B 95%
A n/a
B 95%
75-76-3

tetramethylsilane

10038-98-9

germaniumtetrachloride

A

75-77-4

chloro-trimethyl-silane

B

1529-47-1

chlorotrimethylgermane

C

993-10-2

methyltrichlorogermane

D

75-78-5

dimethylsilicon dichloride

E

1529-48-2

dichlorodimethylgermanium

Conditions
ConditionsYield
aluminium bromide In neat (no solvent) molar ratio Me4Si/GeCl4 = 1/1, at 200°C for 22 h, cooled; NMR, mass spectra, chromy.;A 6%
B 30%
C 15%
D 94%
E 56%
aluminium bromide In neat (no solvent) molar ratio Me4Si/GeCl4 = 0.5/1, at 200°C for 6 h, cooled; NMR, mass spectra, chromy.;A 26%
B 33%
C 30%
D 74%
E 37%
aluminium bromide In neat (no solvent) molar ratio Me4Si/GeCl4 = 1/1, at 200°C for 6 h, cooled; NMR, mass spectra, chromy.;A 60%
B 54%
C 11%
D 40%
E 35%
4342-61-4

1,2-dichlorotetramethylsilane

98-88-4

benzoyl chloride

75-78-5

dimethylsilicon dichloride

Conditions
ConditionsYield
With triphenylphosphine91%
75-76-3

tetramethylsilane

10038-98-9

germaniumtetrachloride

A

75-77-4

chloro-trimethyl-silane

B

1529-47-1

chlorotrimethylgermane

C

865-52-1

tetramethylgermane

D

75-78-5

dimethylsilicon dichloride

Conditions
ConditionsYield
aluminium bromide In neat (no solvent) molar ratio Me4Si/GeCl4 = 4/1, at 200°C for 8 h, cooled; NMR, mass spectra, chromy.;A 91%
B 60%
C 40%
D 9%
aluminium bromide In neat (no solvent) molar ratio Me4Si/GeCl4 = 0.33/1, at 200°C for 5 h, cooled; NMR, mass spectra, chromy.;A 89%
B 74%
C 26%
D 11%
aluminium bromide In neat (no solvent) molar ratio Me4Si/GeCl4 = 3/1, at 200°C for 21 h, cooled; NMR, mass spectra, chromy.;A 80%
B 80%
C 20%
D 20%

(CH2C6H5)3CBCl2

1027-80-1

2,2-dimethyl-1,3-diphenyl-[1,3,2]diazasilolidine

A

75-78-5

dimethylsilicon dichloride

B

2179-97-7

2-(1,1-dibenzyl-2-phenyl-ethyl)-1,3-diphenyl-[1,3,2]diazaborolidine

Conditions
ConditionsYield
A n/a
B 90%
A n/a
B 90%
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Chemistry

The Molecular Structure of Dichlorodimethylsilane (CAS NO.75-78-5):
 
Molecular Formula: C2H6Cl2Si
Molecular Weight: 129.06
EINECS: 200-901-0
Density: 1.06
Melting Point: -76 °C
Boiling Point: 70 °C
Flash Point: -9 °C
Appearance: Colourless liquid
Storage temp: Store at 0-5°C
Water Solubility: reacts
Sensitive: Moisture Sensitive 
IUPAC: dichloro(dimethyl)silane
Synonyms: Dichlorodimethyl-silan ; Dichlorodimethylsilicon ; Dimethyldichlorosilicane ; Dimethyl-dichlorsilan ; Dimethyl-dichlorsilan(czech) ; Dimethyldichlorsilane ; Dimethylsilanedichloride    
Stability: Stable. Reacts violently with water and alcohols. Highly flammable. Incompatible with strong oxidizing agents, water, alcohols, caustics, ammonia.
Product Categories: Chloro;Silicon Compounds;Organics;Dichlorosilanes;Dichlorosilanes (for Polysilanes);Functional Materials;Reagent for High-Performance Polymer Research;Si (Classes of Silicon Compounds);Si-Cl Compounds;Silicon Compounds (for Synthesis);Synthetic Organic Chemistry;Chloro Silanes

Uses

 Dichlorodimethylsilane (CAS NO.75-78-5) is used in ethchlorvynol assay.

Toxicity Data With Reference

1.    

skn-rbt 20 mg/24H MOD

    85JCAE    Prehled Prumyslove Toxikologie; Organicke Latky Marhold, J.,Prague, Czechoslovakia.: Avicenum,1986,1219.
2.    

eye-rbt 5 mg/24H SEV

    85JCAE    Prehled Prumyslove Toxikologie; Organicke Latky Marhold, J.,Prague, Czechoslovakia.: Avicenum,1986,1219.
3.    

orl-rat LD50:5660 µL/kg

    JACTDZ    Journal of the American College of Toxicology. 12 (1993),573.
4.    

ihl-rat LC50:930 ppm/4H

    85JCAE    Prehled Prumyslove Toxikologie; Organicke Latky Marhold, J.,Prague, Czechoslovakia.: Avicenum,1986,1219.
5.    

ipr-rat LDLo:10 mg/kg

    JIDHAN    Journal of Industrial Hygiene. 30 (1948),332.
6.    

ihl-mus LC50:300 mg/m3/2H

    TPKVAL    Toksikologiya Novykh Promyshlennykh Khimicheskikh Veshchestv. Toxicology of New Industrial Chemical Sciences. 3 (1961),23.

Consensus Reports

EPA Extremely Hazardous Substances List. Reported in EPA TSCA Inventory.

Safety Profile

Poison by ingestion and intraperitoneal routes. Moderately toxic by inhalation. A skin and severe eye irritant. Violent reaction on contact with water. When heated to decomposition it emits toxic fumes of Cl. See also CHLOROSILANES.
Hazard Codes: HarmfulXiHarmfulXnFlammableFDangerousN
Risk Statements: 20-59-36/37/38-11-67-65-63-48/20-38-20/21-50/53 
R20: Harmful by inhalation
R59: Dangerous to the ozone layer
R36/37/38: Irritating to eyes, respiratory system and skin
R11: Highly flammable
R67: Vapours may cause drowsiness and dizziness
R65: Harmful: may cause lung damage if swallowed
R63: Possible risk of harm to the unborn child
R38: Irritating to skin
R20/21: Harmful by inhalation and in contact with skin
R50/53: Very toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment
Safety Statements: 60-61-62-36/37-59 
S60: This material and its container must be disposed of as hazardous waste
S61: Avoid release to the environment. Refer to special instructions / safety data sheets
S62: If swallowed, do not induce vomitting; seek medical advice immediately and show this container or label
S36/37: Wear suitable protective clothing and gloves
S59: Refer to manufacturer / supplier for information on recovery / recycling
RIDADR: UN 2924 3/PG 2
WGK Germany: 3
RTECS: VV3150000
F: 3-10-19-21
TSCA: Yes
HazardClass: 3
PackingGroup: II
HS Code: 29310095

Standards and Recommendations

DOT Classification:  3; Label: Flammable Liquid, Corrosive