p-Toluenesulfonyl azide solution
p-Toluenesulfonyl azide solution (CAS: 941-55-9, C7H7N3O2S) is a chemical reagent with a molecular weight of 197.21. Supplied as a solution in toluene (11-15% w/w), it is primarily used in organic synthesis for azidation and diazo transfer reactions. It is also recognized for its application in modifying refractive index changes in transparent PMMA films to create permanent patterns.
- IUPAC
- 4-Methylbenzenesulfonyl azide solution,p-Toluenesulfonazide solution,Tosyl azide solution

Azidation and Diazo Transfer Reactions
p-Toluenesulfonyl azide solution serves as a key reagent for introducing azide groups and facilitating diazo transfer in organic synthesis. These reactions are fundamental for constructing various nitrogen-containing organic molecules.
Material Science Applications
This solution is utilized as a modifier to alter the refractive index of transparent PMMA. This property enables the generation of permanent patterns within PMMA films, finding use in specialized material applications.
Organic Building Block
As a versatile building block, it plays a role in the synthesis of diverse organic compounds. Its reactivity makes it valuable for C-X bond formation and other complex chemical transformations.
| Molecular weight | 197.21 |
|---|---|
| Empirical formula | C7H7N3O2S |
| Assay | ≥96.5% (HPLC)97% |
| Density | ~0.90 g/mL at 20 °C |
| Refractive index | n20/D 1.502 |
| Concentration | 11-15 % (w/w) in toluene |
| Storage temperature | 2-8°C |
| Application | Modifier of refractive index changes of transparent PMMA to generate permanent patterns in films1 |



Hazard statements
- H225Highly flammable liquid and vapour
- H300Fatal if swallowed
- H304May be fatal if swallowed and enters airways
- H315Causes skin irritation
- H336May cause drowsiness or dizziness
- H361D
- H373May cause damage to organs through prolonged exposure
Precautionary statements
- P210Keep away from heat, sparks and open flames. No smoking
- P261Avoid breathing dust, fume, gas or vapours
- P264Wash thoroughly after handling
- P281Use personal protective equipment as required
- P301IF SWALLOWED
- P331Do NOT induce vomiting
| Protective equipment | Eyeshields, Faceshields, full-face respirator (US), Gloves, multi-purpose combination respirator cartridge (US), type ABEK (EN14387) respirator filter |
|---|---|
| Flash point | 4 °C / 39.2 °F |
| Transport (UN / ADR) | UN 1294 3 / PGII |
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | F,T+ |
| Risk statements (R) | 63-11-28-38-48/20-65-67 |
| Safety statements (S) | 9-16-28-35-36/37-45 |
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 p-Toluenesulfonyl azide solution used for?
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p-Toluenesulfonyl azide solution is primarily used for azidation and diazo transfer reactions in organic synthesis. It also serves as a modifier for refractive index changes in transparent PMMA to generate permanent patterns in films.
What are the CAS number and formula for p-Toluenesulfonyl azide solution?
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The CAS number is 941-55-9 and the empirical formula is C7H7N3O2S.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies p-Toluenesulfonyl azide solution with an assay of ≥96.5% (HPLC) or 97%. This is a technical/research grade material, and TSS does not represent it as USP, BP, or EP grade.
How should p-Toluenesulfonyl azide solution be handled safely?
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p-Toluenesulfonyl azide solution is flammable and toxic. Handle with extreme care in a well-ventilated area, using appropriate personal protective equipment including eyeshields, gloves, and a suitable respirator. Refer to the safety data sheet for comprehensive handling information.
How is p-Toluenesulfonyl azide solution shipped?
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p-Toluenesulfonyl azide solution is classified under UN 1294, Hazard Class 3, Packing Group II, indicating it is shipped as a flammable liquid.
How can I request a sample or quote for p-Toluenesulfonyl azide solution?
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To request a sample or a quote, please contact the Tech Serve Solutions sales team through our website or by phone.
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