Tolylene-α,4-diisocyanate
Tolylene-α,4-diisocyanate (CAS 99741-73-8) is an organic compound with the linear formula OCNC 6H 4CH 2NCO and a molecular weight of 174.16 g/mol. It is a versatile building block utilised in chemical synthesis. This diisocyanate is known for its reactivity, making it a key intermediate in the production of various organic compounds and polymers. It is supplied by TSS with an assay of 98%.
- Synonyms
- OCNC6H4CH2NCO

Polymer Synthesis
Tolylene-α,4-diisocyanate can be used as a monomer or cross-linking agent in the synthesis of polyurethanes and other advanced polymeric materials, contributing to specific material properties through its reactive isocyanate groups.
Organic Synthesis Intermediate
Its bifunctional nature allows for its application as an intermediate in the creation of complex organic molecules. It can react with nucleophiles, facilitating the formation of new chemical bonds essential for building more elaborate structures.
Research and Development
This compound serves as a valuable reagent in research laboratories for exploring new synthetic pathways and developing novel chemical entities. Its well-defined reactivity makes it suitable for studying reaction mechanisms and developing new materials.
| Molecular weight | 174.16 |
|---|---|
| Linear formula | OCNC6H4CH2NCO |
| Assay | 98% |
| Boiling point | 152 °C/19 mmHg(lit.) |
| Density | 1.218 g/mL at 25 °C(lit.) |
| Refractive index | n20/D 1.557(lit.) |


Hazard statements
- H315Causes skin irritation
- H317May cause an allergic skin reaction
- H319Causes serious eye irritation
- H330Fatal if inhaled
- H335May cause respiratory irritation
- H351Suspected of causing cancer
Precautionary statements
- P260Do not breathe dust, fume, gas, mist, vapours or spray
- P280Wear protective gloves, clothing and eye/face protection
- P284Wear respiratory protection
- P305IF IN EYES
- P310Immediately call a POISON CENTER or doctor
| Protective equipment | Eyeshields, Faceshields, full-face respirator (US), Gloves, multi-purpose combination respirator cartridge (US), type ABEK (EN14387) respirator filter |
|---|---|
| Flash point | 110 °C≤0.0001% total nitrogen (N)≤0.0005% heavy metals (as Pb)≤0.5% Na2CO3 / 230 °F |
| Transport (UN / ADR) | UN 2078 6.1 / PGII |
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | T+ |
| Risk statements (R) | 26-36/37/38-40-42/43-52/53 |
| Safety statements (S) | 23-36/37-45-61 |
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 Tolylene-α,4-diisocyanate used for?
+
Tolylene-α,4-diisocyanate is primarily used as a building block in chemical synthesis and for the production of polymers. It serves as an intermediate in the creation of complex organic molecules and in research and development for exploring new materials and reaction pathways.
What is the CAS number and formula for Tolylene-α,4-diisocyanate?
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The CAS number for Tolylene-α,4-diisocyanate is 99741-73-8. The linear formula is OCNC 6H 4CH 2NCO.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies Tolylene-α,4-diisocyanate with a purity of 98%. This is a technical/research grade chemical, and TSS does not represent it as USP, BP, or EP grade.
What are the main hazards associated with Tolylene-α,4-diisocyanate?
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Tolylene-α,4-diisocyanate is classified as Danger. It is harmful if inhaled, causes skin and serious eye irritation, and may cause an allergic skin reaction and respiratory irritation. It is also suspected of causing cancer. Appropriate personal protective equipment, including respirators and chemical-resistant gloves, must be used. Always consult the Safety Data Sheet (SDS) for comprehensive handling information.
How is Tolylene-α,4-diisocyanate packed, shipped, and exported?
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Tolylene-α,4-diisocyanate is packed and shipped in accordance with international regulations for hazardous materials, including UN 2078, Class 6.1, Packing Group II. TSS is an experienced global supplier and exporter of fine chemicals.
How can I request a sample or quote for Tolylene-α,4-diisocyanate?
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To request a sample or obtain a quote for Tolylene-α,4-diisocyanate, please contact the TSS sales department through the website or via direct inquiry, providing your specific requirements.
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