3-(Trimethylsilyl)ethynylbenzaldehyde
3-(Trimethylsilyl)ethynylbenzaldehyde (CAS: 77123-55-8) is an organic compound with the formula C12H14OSi and a molecular weight of 202.32 g/mol. This versatile building block combines an aldehyde functional group with a trimethylsilyl-protected alkyne, making it valuable in organic synthesis. It serves as an intermediate in the development of complex organic molecules and materials, particularly within pharmaceutical research and fine chemical manufacturing.

Organic Synthesis Intermediate
Utilised as a key building block in multi-step organic syntheses, enabling the introduction of both aldehyde and silyl-protected alkyne functionalities into target molecules. Its structure facilitates diverse chemical transformations.
Pharmaceutical Research
Serves as a precursor in the synthesis of novel pharmaceutical agents and drug candidates. The compound's reactive groups allow for elaboration into complex molecular architectures relevant to medicinal chemistry.
Materials Science
Can be employed in the creation of advanced materials, such as organic semiconductors or polymers, where the ethynyl group can participate in polymerisation or cross-linking reactions.
| Molecular weight | 202.32 |
|---|---|
| Empirical formula | C12H14OSi |
| Assay | 95% |
| Density | 0.962 g/mL at 25 °C |
| Refractive index | n20/D 1.547 |
| Storage temperature | 2-8°C |

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
| Flash point | >110 °C / >230 °F |
|---|---|
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | Xi |
| Risk statements (R) | 36/37/38 |
| Safety statements (S) | 26 |
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 3-(Trimethylsilyl)ethynylbenzaldehyde used for?
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3-(Trimethylsilyl)ethynylbenzaldehyde is primarily used as a building block in organic synthesis, particularly in pharmaceutical research and the development of new materials. Its aldehyde and protected alkyne groups allow for versatile chemical modifications.
What is the CAS number and formula for 3-(Trimethylsilyl)ethynylbenzaldehyde?
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The CAS number is 77123-55-8, and the molecular formula is C12H14OSi.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies 3-(Trimethylsilyl)ethynylbenzaldehyde with a minimum assay of 95%. This product is intended for research and development purposes and is not supplied as USP, BP, EP, or any other pharmacopoeia grade.
How should 3-(Trimethylsilyl)ethynylbenzaldehyde be handled and stored?
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This compound is classified as a Warning with hazards H315 (Causes skin irritation), H319 (Causes serious eye irritation), and H335 (May cause respiratory irritation). It should be handled with appropriate personal protective equipment in a well-ventilated area. Store at 2-8°C to maintain stability.
How is 3-(Trimethylsilyl)ethynylbenzaldehyde shipped?
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Tech Serve Solutions exports and supplies 3-(Trimethylsilyl)ethynylbenzaldehyde globally. Packaging and shipping methods comply with all relevant international regulations for chemical transport.
How can I request a quote or sample?
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To request a quote or a sample of 3-(Trimethylsilyl)ethynylbenzaldehyde, please use the contact form on our website or call our sales department. Specify the quantity required and your delivery details.
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