Hexamethyldisilazane, commonly abbreviated as HMDS and identified by CAS number 999-97-3, is a foundational organosilicon compound with a broad spectrum of applications in chemistry and material science. Its unique chemical structure and reactivity make it a go-to reagent for synthesis, analysis, and advanced material preparation. For professionals seeking to purchase HMDS, understanding its core attributes and available sourcing options is vital.

Key Chemical Properties of HMDS:

• Appearance: HMDS is typically a colorless liquid.
• Molecular Formula: C6H19NSi2
• Molecular Weight: Approximately 161.39 g/mol.
• Boiling Point: Around 125-126 °C, making it relatively easy to handle and distill.
• Density: Approximately 0.774 g/mL at 25 °C.
• Reactivity: It is sensitive to moisture, undergoing slow hydrolysis, which is a characteristic that can be exploited in certain reactions but also necessitates careful storage under inert atmosphere.
• Solubility: HMDS is miscible with many organic solvents, including acetone, benzene, and ethyl ether.

Diverse Applications of HMDS:

The utility of HMDS stems from its ability to readily participate in silylation reactions, where it introduces trimethylsilyl (TMS) groups. This capability is harnessed in several key areas:

• Pharmaceutical Intermediate Synthesis: HMDS is indispensable for protecting sensitive functional groups (like -OH, -NH2, -SH) during complex multi-step syntheses of active pharmaceutical ingredients (APIs). This protection is crucial for controlling reaction pathways and achieving high yields.
• Organic Synthesis Reagent: Beyond protection, HMDS is a precursor for powerful, non-nucleophilic bases (e.g., LiHMDS, NaHMDS) widely used in deprotonation and other advanced organic transformations.
• Gas Chromatography (GC) Derivatization: HMDS is commonly used to silylate polar compounds, increasing their volatility and making them amenable to GC analysis. This is vital for quality control and research in various chemical industries.
• Material Science and Electronics: HMDS serves as a precursor for chemical vapor deposition (CVD) of silicon-containing films, such as silicon carbonitride, used in semiconductor manufacturing. It also functions as an adhesion promoter for photoresists.
• Surface Modification: The compound can be employed to create hydrophobic surfaces by reacting with hydroxyl groups on materials like glass and silica.

Sourcing HMDS: Finding Reliable Suppliers

When the need arises to buy HMDS, particularly in bulk quantities for industrial or extensive research purposes, sourcing from reliable manufacturers is critical. China has emerged as a significant global supplier of fine chemicals, offering competitive pricing and substantial production capacities. Professionals can find numerous HMDS manufacturers and suppliers based in China. Key considerations when sourcing include:

• Purity: Ensure the supplier can provide the required purity grade (e.g., 98% or 99%) with verifiable Certificates of Analysis.
• Supply Chain Reliability: Assess the manufacturer's production capacity and their ability to ensure consistent, timely delivery.
• Technical Support: A responsive supplier offering technical data and support can significantly ease the procurement and application process.
• Price: Obtain quotes from multiple suppliers to ensure you are getting competitive market pricing.

As a leading manufacturer and supplier in China, we are dedicated to providing high-quality HMDS (CAS 999-97-3) to meet diverse industrial and research demands. We focus on ensuring purity, reliability, and competitive pricing for our clients worldwide. For all your HMDS purchase inquiries, we invite you to connect with us.