Methyltrichlorosilane Chemical Properties

Melting point:

-77 °C

Boiling point:

66 °C (lit.)

Density 

1.273 g/mL at 25 °C (lit.)

vapor density 

5.2 (vs air)

vapor pressure 

150 mm Hg ( 25 °C)

refractive index 

n20/D 1.411

Flash point:

5 °F

storage temp. 

Flammables area

solubility 

sol methylene chloride.

form 

liquid

Specific Gravity

1.275

color 

colorless

explosive limit

5.5-10.4%(V)

Water Solubility 

REACTS

FreezingPoint 

-77.8℃

Sensitive 

Moisture Sensitive

Hydrolytic Sensitivity

8: reacts rapidly with moisture, water, protic solvents

BRN 

1361381

Stability:

Stable, but reacts violently with water. Highly flammable. Incompatible with moisture, water, strong bases, strong acids, strong oxidizing agents.

InChIKey

JLUFWMXJHAVVNN-UHFFFAOYSA-N

CAS DataBase Reference

75-79-6(CAS DataBase Reference)

NIST Chemistry Reference

Silane, trichloromethyl-(75-79-6)

EPA Substance Registry System

Methyltrichlorosilane (75-79-6)

Safety Information

Hazard Codes 

F,Xi,C

Risk Statements 

11-14-36/37/38-37-35-22-21-20

Safety Statements 

26-39-45-36/37/39

RIDADR 

UN 1250 3/PG 1

WGK Germany 

1

RTECS 

VV4550000

F 

10-21

Autoignition Temperature

>760 °F

TSCA 

Yes

HazardClass 

3

PackingGroup 

I

HS Code 

29310095

Hazardous Substances Data

75-79-6(Hazardous Substances Data)

MSDS

• Language:English Provider:Methyltrichlorosilane
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Methyltrichlorosilane Usage And Synthesis

Chemical Properties

Colorless clear liquid

Physical properties

bp 66 °C; d 1.273 g cm?3.

Uses

Methyltrichlorosilane is used in production of methyl silicone resins, its vapor reacts with water on surfaces to give a thin layer of methylpolysiloxane which make it a water-repellent film. A combination of methyltrichlorosilane and sodium iodide can be used to cleave carbon-oxygen bonds such as methyl ethers. It is used as a precursor for forming various cross-linked siloxane polymers. Trichloromethylsilane is the starting material for the production of pure silicon for manufacture of semiconductors and optical fibers.

Uses

Intermediate for silicones.

Uses

Methyltrichlorosilane is widely used as precursor to organosilicon compounds; silylating agent and Lewis acid. MeSiCl3 is an effective Lewis acid in the condensation of carboxylic acids with alcohols and amines.

Production Methods

Produced by Grignard reaction of silicon tetrachloride and methylmagnesium chloride.

General Description

A colorless fuming liquid with a pungent odor. Flash point 8°F. Vapor and liquid may cause burns. Denser than water. Vapors are heavier than air.

Reactivity Profile

Chlorosilanes, such as Methyltrichlorosilane, are compounds in which silicon is bonded to from one to four chlorine atoms with other bonds to hydrogen and/or alkyl groups. Chlorosilanes react with water, moist air, or steam to produce heat and toxic, corrosive fumes of hydrogen chloride. They may also produce flammable gaseous H2. They can serve as chlorination agents. Chlorosilanes react vigorously with both organic and inorganic acids and with bases to generate toxic or flammable gases.

Hazard

Flammable, dangerous fire risk, may formexplosive mixture with air. Strong irritant.

Health Hazard

As with other chlorosilanes, acute exposures may be highly toxic and may cause death or permanent injury after very short exposures to small quantitites. Chronic exposures may be moderately toxic and involve irreversible and reversible changes. Skin contact may produce severe burns with pain and risk of secondary infections. Ingestion may produce oral, esophageal, and stomach burns, intensity will vary from mild to very severe, gastrointestinal damage is rare but may occur.

Fire Hazard

Toxic hydrogen chloride and phosgene gases may form in fires. Reacts with water or steam to form hydrochloric acid. Vapor forms flammable mixture with air. May form explosive mixture in air. Avoid contact with water or moist air.

Safety Profile

Poison by inhalation and intraperitoneal routes. Moderately toxic by ingestion. A severe irritant to skin, eyes, and mucous membranes. Flammable when exposed to heat or flame; can react vigorously with oxidizing materials. When heated to decomposition it emits toxic fumes of Cl-.

Purification Methods

Methyl trichlorosilane [75-79-6] M 149.5, b 13,7o/101mm, 64.3o/710.8mm, 65.5o/745mm, 6 6 . 1o/atm, d 4 1.263, n D If very pure, distil it before use. 20 1.4110. The purity is checked by NMR ( in MeCN is 13.14ppm with respect to Me4Si). Possible contaminants are other silanes which can be removed by fractional distillation through a Stedman column (p 11) of >72 theoretical plates with total reflux and 0.35% take-off. This apparatus should be under N2 gas at a rate of 12 bubbles/minute fed into the line using an Hg manometer to control the pressure. It is sensitive to H2O. [Gillam et al. J Am Chem Soc 73 4252 1951, Olah et al. J Org Chem 48 3667 1983, Beilstein 4 IV 4212.]

Methyltrichlorosilane(75-79-6)Related Product Information

• Methyltrimethoxysilane
• 1,2-DIBROMOETHYLTRICHLOROSILANE
• tert-Butyltrichlorosilane
• Trichloro(3,3,3-trifluoropropyl)silane
• 1-CHLOROETHYLTRICHLOROSILANE
• Trichlorovinylsilane
• Cyclohexyltrichlorosilane
• 2-[2-(TRICHLOROSILYL)ETHYL]PYRIDINE
• DODECYLTRICHLOROSILANE
• HEXYLTRICHLOROSILANE
• N-DECYLTRICHLOROSILANE
• 2-(CARBOMETHOXY)ETHYLTRICHLOROSILANE
• (DICHLOROPHENYL)TRICHLOROSILANE
• N-OCTADECYLTRICHLOROSILANE
• Methyltrichlorosilane
• 3-Chloropropyltrichlorosilane
• (Chloromethyl)trichlorosilane
• Phenyltrichlorosilane