3-Cyano-PROXYL
3-Cyano-PROXYL (CAS 2154-70-3) is a stable nitroxyl radical with the molecular formula C9H15N2O and a molecular weight of 167.23 g/mol. This compound is recognised for its paramagnetic properties and serves as a valuable reagent in radical chemistry and organic synthesis. It is typically stored under refrigerated conditions (2-8°C) to maintain its integrity and reactivity for various research and development applications.
- IUPAC
- 3-Cyano-2,2,5,5-tetramethyl-1-pyrrolidinyloxy, free radical

Radical Chemistry Research
3-Cyano-PROXYL is extensively used as a spin label and probe in Electron Paramagnetic Resonance (EPR) spectroscopy to study molecular dynamics and structure. Its stable radical nature makes it ideal for investigating reaction mechanisms involving free radicals.
Organic Synthesis
As a synthetic reagent, this compound can participate in various organic transformations. It is employed in the synthesis of complex molecules and as a mediator in controlled radical polymerisation processes.
Material Science
The paramagnetic properties of 3-Cyano-PROXYL find applications in the development of novel paramagnetic materials and functional polymers. It can be incorporated into polymer backbones or side chains to impart specific electronic or magnetic characteristics.
| Molecular weight | 167.23 |
|---|---|
| Empirical formula | C9H15N2O |
| Storage temperature | 2-8°C |
| Melting point | 31-33 °C(lit.) |

Hazard statements
- H302Harmful if swallowed
- H312Harmful in contact with skin
- H332Harmful if inhaled
Precautionary statements
- P280Wear protective gloves, clothing and eye/face protection
| Protective equipment | dust mask type N95 (US), Eyeshields, Gloves |
|---|---|
| Flash point | 113 °C / 235.4 °F |
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | Xn |
| Risk statements (R) | 20/21/22 |
| Safety statements (S) | 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-Cyano-PROXYL used for?
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3-Cyano-PROXYL is primarily used in radical chemistry research, particularly as a spin label for EPR spectroscopy, and as a synthetic reagent in organic synthesis and material science.
What are the CAS number and formula for 3-Cyano-PROXYL?
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The CAS number for 3-Cyano-PROXYL is 2154-70-3, and its molecular formula is C9H15N2O.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies 3-Cyano-PROXYL as a research-grade chemical. We do not represent it as meeting USP, BP, EP, or other pharmacopoeial standards. Please refer to the product's Certificate of Analysis for specific purity details.
How should 3-Cyano-PROXYL be handled and stored?
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3-Cyano-PROXYL is classified with the signal word 'Warning' and hazard statements H302, H312, and H332 (Harmful if swallowed, in contact with skin, or if inhaled). Handle with appropriate personal protective equipment, including a dust mask (type N95 US), eyeshields, and gloves. Store at 2-8°C.
How is 3-Cyano-PROXYL packed, shipped, and exported?
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3-Cyano-PROXYL is carefully packed to ensure safe transport and compliance with international shipping regulations. We specialise in the global export of fine chemicals to research institutions and industrial clients worldwide.
How can I request a sample or quote for 3-Cyano-PROXYL?
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To request a sample or a quotation for 3-Cyano-PROXYL, please contact our sales team directly through the TSS website or by calling our customer service line. Please specify the quantity required.
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