3-(Trimethylsilyl)propynoic acid
3-(Trimethylsilyl)propynoic acid (CAS: 5683-31-8) is a versatile organic building block with a molecular weight of 142.23 g/mol. This carboxylic acid derivative, featuring a silyl-protected alkyne, serves as a valuable intermediate in organic synthesis. Its structure allows for participation in various chemical transformations, making it useful in the development of complex molecules within research and industrial settings.
- IUPAC
- 3-(Trimethylsilyl)propiolic acid

Organic Synthesis Intermediate
Utilised as a building block for constructing carbon frameworks and introducing functional groups in multi-step synthetic pathways. The silyl-protected alkyne moiety offers controlled reactivity in cross-coupling reactions and cycloadditions.
Material Science Research
Can be incorporated into polymers or advanced materials where the unique properties of the trimethylsilyl group and the alkyne functionality are desired for tailored performance characteristics.
Pharmaceutical and Agrochemical Development
Serves as a precursor or key intermediate in the synthesis of biologically active compounds, contributing to the discovery and development of new therapeutic agents and crop protection chemicals.
| Molecular weight | 142.23 |
|---|---|
| Linear formula | (CH3)3SiC≡CCO2H |
| Assay | 98% |
| Boiling point | 105-110 °C/10 mmHg(lit.) |
| Melting point | 47-49 °C(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 | 96 °C / 204.8 °F |
| 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 3-(Trimethylsilyl)propynoic acid used for?
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3-(Trimethylsilyl)propynoic acid is primarily used as a building block and intermediate in organic synthesis, with applications in material science and the development of pharmaceuticals and agrochemicals.
What is the CAS number and formula for 3-(Trimethylsilyl)propynoic acid?
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The CAS number is 5683-31-8 and its linear formula is (CH3)3SiC≡CCO2H.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies 3-(Trimethylsilyl)propynoic acid with an assay of 98%. This product is intended for research and laboratory use; we do not represent it as USP, BP, or EP grade.
How is 3-(Trimethylsilyl)propynoic acid classified for safety?
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This compound is classified with the GHS07 symbol and a 'Warning' signal word. It carries hazard statements H315 (causes skin irritation), H319 (causes serious eye irritation), and H335 (may cause respiratory irritation). Appropriate personal protective equipment, including eyeshields and gloves, should be used.
Is 3-(Trimethylsilyl)propynoic acid a controlled substance?
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Based on the provided data, 3-(Trimethylsilyl)propynoic acid is not listed as a controlled substance.
How is 3-(Trimethylsilyl)propynoic acid packed, shipped, or exported?
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Tech Serve Solutions, as a specialist global supplier and exporter, ensures appropriate packaging and compliance with all regulations for the safe and secure shipment of chemicals worldwide.
How can I request a sample or quote for 3-(Trimethylsilyl)propynoic acid?
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To request a sample or a quote, please contact our sales team through the website or by phone, providing your specific requirements and shipping details.
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