Trimethylchlorosilane (TMCS), CAS 75-77-4, is also known as chlorotrimethylsilane or trimethylsilyl chloride. It is a low-molecular-weight organosilicon reagent used in silylation and organosilicon synthesis. Confirm water-sensitive handling, required specification, quantity, packaging, destination and document needs before quotation.
Trimethylchlorosilane (TMCS) CAS 75-77-4
- CAS: 75-77-4
- Synonyms: Chlorotrimethylsilane; Trimethylsilyl chloride; TMCS; TMSCl
- Einecs: 200-900-5
- Molecular Formula: C₃H₉ClSi
- Grade: Confirm the current product-specific specification.
- Package: Confirm packaging for the offered material and destination requirements.
Product Description
Trimethylchlorosilane (TMCS) is an organosilicon reagent with a reactive silicon-chlorine bond, used in silylation and other controlled organosilicon transformations.
Alternative names: Chlorotrimethylsilane; Trimethylsilyl chloride; TMCS; TMSCl.
Molecular formula: C₃H₉ClSi.
Molar mass: 108.64 g/mol.
CAS Number: 75-77-4.
EINECS: 200-900-5.
Melting point: confirm the current product-specific value.
Boiling point: confirm the current product-specific value.
Water reactivity and handling requirements: confirm the current product-specific value.
Physical form, appearance, and key quality limits: confirm the current product-specific specification.
Flash point and handling requirements: confirm the current product-specific value.
Typical industrial context: TMCS is used as a silylation reagent and an organosilicon synthesis input. Confirm water-sensitive handling and process requirements before quotation.
Protective measures
Water-sensitive handling requirements should be reviewed against the applicable SDS and current product-specific specification.
Confirm process-equipment compatibility and required containment measures for the intended use.
Use the applicable SDS, site risk assessment, and current product specification when defining protective controls.
FAQ - Technical & Supply Chain
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Q:
Are TMCS, TMSCl, and Chlorotrimethylsilane the same material?
A: Yes. Trimethylchlorosilane, TMCS, TMSCl and Chlorotrimethylsilane all identify CAS 75-77-4, with molecular formula C3H9ClSi. CAS identity still requires confirmation of assay, residual acid and boiling range for the offered grade. -
Q:
What is Trimethylchlorosilane used for?
A: Trimethylchlorosilane is a low-molecular-weight organosilicon reagent used for silylation, protecting-group chemistry and organosilicon synthesis. It is highly moisture-sensitive and requires water-free handling and transfer. -
Q:
Which parameters matter for Trimethylchlorosilane?
A: Confirm GC assay, color and appearance, residual hydrogen chloride or chlorosilane impurities, boiling range, water sensitivity, inhibitor status if applicable, and the required packaging for dry, moisture-tight transfer. -
Q:
How should Trimethylchlorosilane be stored, handled, and transported?
A: Store Trimethylchlorosilane under dry, inert conditions where required, away from water, moisture, heat, sparks and open flames. It is commonly transported as UN 1298, Hazard Class 3 with a Class 8 subsidiary risk, Packing Group II. Use moisture-excluding transfer equipment and confirm the approved packaging before shipment. -
Q:
What are typical physical properties of Trimethylchlorosilane?
A: Trimethylchlorosilane is a colorless, fuming liquid with a sharp odor. Reported values include a boiling point around 57-59 degrees Celsius, melting point roughly -40 to -58 degrees Celsius, density about 0.85-0.86 g/mL and a closed-cup flash point near -28 to -18 degrees Celsius; it hydrolyzes readily on contact with water.
Ordering & Documentation
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