440191

Hexamethyldisilazane

reagent grade, ≥99%

• Synonym(s): Bis(trimethylsilyl)amine, HMDS
• Linear Formula: (CH₃)₃SiNHSi(CH₃)₃
• CAS Number: 999-97-3
• Molecular Weight: 161.39
• Beilstein: 635752
• EC Number: 213-668-5
• MDL number: MFCD00008259
• UNSPSC Code: 12352103
• PubChem Substance ID: 24867576
• NACRES: NA.23

Properties

• grade: reagent grade
• Quality Level: 300
• Assay: ≥99%
• form: liquid
• refractive index: n20/D 1.407 (lit.)
• bp: 125 °C (lit.)
• SMILES string: C[Si](C)(C)N[Si](C)(C)C
• InChI: 1S/C6H19NSi2/c1-8(2,3)7-9(4,5)6/h7H,1-6H3
• InChI key: FFUAGWLWBBFQJT-UHFFFAOYSA-N

Description

General description

Hexamethyldisilane (HMDS) is a stable and effectivereagent for trimethylsilylation of hydrogen-labile substrates such as alcohols,amines, and carboxylic acids. It is commonly used for the protection of sensitivefunctional groups during chemical synthesis. Owing to its low cost, high vapor pressure, and safety, itis widely used as a precursor in chemical vapor deposition(CVD) reactions.

Application

Hexamethyldisilane (HMDS) can be used:

• As a silylating agent in the trimethylsilylation of alcohols under nearly neutral reaction conditions.
• To control the molecular weights of polypeptides during ring-opening polymerization of α-amino acid N-carboxyanhydrides.
• To fabricate silicon carbonitride thin films by plasma-enhanced CVD.
• For specimen preparation for scanning electron microscopy and the preparation of trimethylsilyl ethers from hydroxy compounds.

Features and Benefits

• High chemicalstability and low molecular weight
• Nontoxic andcost-effective reagent
• Ammonia is theonly byproduct generated during silylation
• Silylationreaction using HDMS is nearly neutral and does not need any precaution

Safety Information

• Pictograms: GHS02,GHS06
• Signal Word: Danger
• Hazard Statements: H225,H302 + H332,H311,H412
• Precautionary Statements: P210 - P273 - P280 - P301 + P312 - P303 + P361 + P353 - P304 + P340 + P312
• Hazard Classifications: Acute Tox. 3 Dermal - Acute Tox. 4 Inhalation - Acute Tox. 4 Oral - Aquatic Chronic 3 - Flam. Liq. 2
• Storage Class Code: 3 - Flammable liquids
• WGK: WGK 2
• Flash Point(F): 52.5 °F - closed cup
• Flash Point(C): 11.4 °C - closed cup
• Personal Protective Equipment: dust mask type N95 (US), Eyeshields, Gloves