Trimethoxyphenylsilane
Trimethoxyphenylsilane (CAS: 2996-92-1), with the molecular formula C6H5Si(OCH3)3 and a molecular weight of 198.29 g/mol, is a clear liquid organosilicon compound. It serves as a valuable intermediate in chemical synthesis and finds applications in materials science, particularly in micro/nanoelectronics and nanomaterial development. This silane is also recognised as a precursor for Polyhedral Oligomeric Silsesquioxanes (POSS) and is utilized in self-assembly processes.
- IUPAC
- (Trimethoxysilyl)benzene,Phenyltrimethoxysilane

Organosilicon Chemistry
As a trialkoxysilane, Trimethoxyphenylsilane is employed as a building block in the synthesis of various organosilicon compounds and polymers. Its phenyl group offers specific functionalities for further chemical modifications.
Materials Science
This compound is used in the development of advanced materials, including functionalized surfaces and hybrid organic-inorganic materials. Its ability to form siloxane networks is crucial for creating materials with tailored properties.
Nanotechnology
Trimethoxyphenylsilane acts as a precursor for Polyhedral Oligomeric Silsesquioxanes (POSS), which are nanostructured materials. It is also employed in self-assembly techniques for creating ordered nanostructures and thin films.
Micro/Nanoelectronics
The compound can be utilised in the fabrication of electronic components and devices, contributing to the development of new dielectric layers or surface modification agents in microelectronic applications.
| Molecular weight | 198.29 |
|---|---|
| Linear formula | C6H5Si(OCH3)3 |
| Assay | 98% |
| Form | liquid |
| Boiling point | 233 °C(lit.) |
| Density | 1.062 g/mL at 25 °C(lit.) |
| Refractive index | n20/D 1.468(lit.) |

Hazard statements
- H315Causes skin irritation
- H319Causes serious eye irritation
- H335May cause respiratory irritation
Precautionary statements
- P261Avoid breathing dust, fume, gas or vapours
- P305IF IN EYES
| Protective equipment | Eyeshields, full-face respirator (US), Gloves, multi-purpose combination respirator cartridge (US), type ABEK (EN14387) respirator filter |
|---|---|
| Flash point | 84 °C / 183.2 °F |
| Transport (UN / ADR) | UN 1993 / PGIII |
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | Xi |
| Risk statements (R) | 36/37/38 |
| Safety statements (S) | 26-36 |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
Documentation
Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.
Supply & logistics
Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.
What is Trimethoxyphenylsilane used for?
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Trimethoxyphenylsilane is used in chemical synthesis, materials science, micro/nanoelectronics, and as a precursor for POSS nanohybrids and self-assembly materials. It is a key organosilicon intermediate.
What is the CAS number and chemical formula for Trimethoxyphenylsilane?
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The CAS number is 2996-92-1 and the chemical formula is C6H5Si(OCH3)3.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies Trimethoxyphenylsilane with an assay of 98%. This product is not represented as USP, BP, or EP grade.
What are the safety and handling considerations for Trimethoxyphenylsilane?
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Trimethoxyphenylsilane is classified as a Warning substance, indicated by GHS07. It causes skin irritation (H315), serious eye irritation (H319), and may cause respiratory irritation (H335). Appropriate personal protective equipment, including eyeshields and gloves, must be used. Ensure adequate ventilation.
How is Trimethoxyphenylsilane packed, shipped, and exported?
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Trimethoxyphenylsilane is typically packed in appropriate containers suitable for liquids and is shipped in compliance with relevant transport regulations, including ADR UN 1993 PGIII.
How can I request a sample or quote for Trimethoxyphenylsilane?
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To request a sample or quote for Trimethoxyphenylsilane, please contact the Tech Serve Solutions sales team through our website or by phone.
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