75-54-7 Usage
Description
Methyl dichlorosilane, is a colorless liquid with a sharp irritating odor. It is a dangerous fire risk, corrosive, and water reactive. The flammable range is wide, from 6% on the lower end to 55% on the upper end. Boiling point is 107°F (41°C), flash point is 15°F (?9°C), and ignition temperature is more than 600°F (315°C). Specific gravity is 1.11, which is heavier than water. Vapors are heavier than air and will travel to ignition sources. It is immiscible in water and decomposes on contact to release hydrogen chloride gas. Methyl dichlorosilane is toxic by inhalation and skin absorption; it is irritating to the skin, eyes, and respiratory system. Contact with the material may cause burns to the eyes and skin. The four-digit UN identification number is 1242. The NFPA 704 designation is health 3, flammability 3, and reactivity 2. The white space at the bottom of the diamond has a W with a slash through it, indicating water reactivity. The primary use is in the manufacture of siloxanes, which are straight-chained compounds similar to paraffin hydrocarbons.
Chemical Properties
Methyl dichlorosilane is a clear, straw-colored
liquid.
Uses
Dichloromethylsilane is a monomer ('building block') in the production of silicone polymers. An intermediate (starting material) in the production of other organic and inorganic chemicals. In the electronics industry for the production of ultra-pure polysilicon and in the manufacture of semiconductors and photovoltaics.
Application
Provides better diastereoselective reductive aldol reactionbetween an aldehyde and an acrylate ester than othersilanes. Forms high-boiling polymeric by-products uponaqueous work-up.
General Description
A colorless fuming liquid with a pungent odor. Flash point: -26°F; Boiling point: 41°C (106°F) . Vapors heavier than air. Vapor and liquid may cause burns. Denser than water and decomposed by water to form hydrochloric acid, a corrosive material.
Reactivity Profile
Chlorosilanes, such as Dichloromethylsilane, 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. Impact of dichlorosilane causes mixtures to burst into flame. This is the case, when the dichlorosilane and most likely related substances are mixed with oxidants such as potassium permanganate, lead oxide, copper oxide, or silver oxide, even under inert gas atmosphere [Bretherick, 1995, pg. 193]. With Dichloromethylsilane, toxic hydrogen chloride and phosgene gases may be formed when burned.
Hazard
Flammable, dangerous fire risk. Very toxic.
Health Hazard
Inhalation causes irritation of respiratory tract; heavy exposure can cause pulmonary edema. Contact of liquid with skin or eyes causes severe burns. Ingestion causes burns of mouth and stomach.
Chemical Reactivity
Reactivity with Water Reacts violently to form hydrogen chloride (hydrochloric acid); Reactivity with Common Materials: Reacts with surface moisture to evolve hydrogen chloride, which is corrosive to common metals; Stability During Transport: Stable; Neutralizing Agents for Acids and Caustics: Flood with water, rinse with sodium bicarbonate or lime solution; Polymerization: Not pertinent; Inhibitor of Polymerization: Not pertinent.
Safety Profile
Moderately toxic by
inhalation. Corrosive. A severe irritant to
skin, eyes, and mucous membranes. Ignites
spontaneously in air. A very dangerous fire
hazard when exposed to heat or flame.
Forms impact-sensitive explosive mixtures
with potassium permanganate, lead(Ⅱ)
oxide, lead(Ⅳ) oxide, copper oxide, silver
oxide. To fight fire, use water, foam, CO2,
mist. When heated to decomposition it
emits toxic fumes of Cl-. See also
CHLOROSILANE.
Potential Exposure
This material is used to make
siloxanes and other silicone polymer (polysiloxane) materials.
Incompatibilities: May form explosive mixture with air.
Reacts violently with water producing heat, corrosive
hydrochloric acid and flammable hydrogen. Methyl dichlorosilane may spontaneously ignite on contact with air (even
under inert gas) and on contact with potassium permanganate, lead(II) oxide; copper oxide; silver oxide. Violent
reaction with oxidizers. Decomposes on contact with hot
surfaces or flames producing toxic and corrosive fumes
including silicon oxides, hydrogen chloride, and phosgene.
Decomposes on contact with alkaline compounds producing
highly flammable hydrogen gas. Corrodes many metals in
presence of water. Attacks some plastics, rubber and
coatings.
Shipping
UN1242 Methyldichlorosilane Hazard Class:
4.3; Labels: 4.3-Dangerous when wet material; 8-Corrosive
material, 3-Flammable liquid.
Purification Methods
Impurities are generally other chloromethyl silanes. Distil it through a conventional Stedman column (p 11) of 20 theoretical plates or more. It should be protected from H2O by storing over P2O5. [Stck & Somieski Chem Ber 52 695 1919, Sauer J Am Chem Soc 68 962 1946, Beilstein 4 IV 4096.]
Waste Disposal
See “Spill Handling.”
Check Digit Verification of cas no
The CAS Registry Mumber 75-54-7 includes 5 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 2 digits, 7 and 5 respectively; the second part has 2 digits, 5 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 75-54:
(4*7)+(3*5)+(2*5)+(1*4)=57
57 % 10 = 7
So 75-54-7 is a valid CAS Registry Number.
InChI:InChI=1/CH4Cl2Si/c2-1(3)4/h1H,4H3
75-54-7Relevant articles and documents
Vanderwielen,Ring
, p. 421 (1972)
PROCESS FOR THE STEPWISE SYNTHESIS OF SILAHYDROCARBONS
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Page/Page column 61; 62, (2021/12/08)
The invention relates to a process for the stepwise synthesis of silahydrocarbons bearing up to four different organyl substituents at the silicon atom, wherein the process includes at least one step a) of producing a bifunctional hydridochlorosilane by a redistribution reaction, selective chlorination of hydridosilanes with an ether/HCI reagent, or by selective chlorination of hydridosilanes with SiCI4, at least one step b) of submitting a bifunctional hydridochloromonosilane to a hydrosilylation reaction, at least one step c) of hydrogenation of a chloromonosilane, and a step d) in which a silahydrocarbon compound is obtained in a hydrosilylation reaction.
SYNTHESIS OF ORGANO CHLOROSILANES FROM ORGANOSILANES
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Page/Page column 36; 37; 38; 39; 40; 49; 50, (2019/04/16)
The invention relates to a process for the production of chlorosilanes by subjecting one or more hydndosilanes to the reaction with hydrogen chloride in the presence of at least one ether compound, and a process for the production of such hydndosilanes serving as starting materials.
PROCESS FOR THE PRODUCTION OF ORGANOHYDRIDOCHLOROSILANES
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Page/Page column 35; 36, (2019/04/16)
The invention relates to a process for the manufacture of organomonosilanes bearing both hydrogen and chlorine substituents at the silicon atom by subjecting a silane substrate comprising one or more silanes selected from organomonosilanes, organodisilanes and organocarbodisilanes, with the proviso that at least one of these silanes has at least one chlorine substituent at the silicon atom, to a redistribution reaction in the presence of a phosphane or amine acting as a redistribution catalyst.