Butyl isocyanate
Butyl isocyanate (CAS: 111-36-4), with the chemical formula CH3(CH2)3NCO, is a reactive organic compound. Possessing a molecular weight of 99.13 g/mol, this flammable liquid is primarily utilised as a versatile building block in chemical synthesis. Its isocyanate group readily participates in reactions, making it valuable for creating more complex molecules in research and industrial applications.

Organic Synthesis Intermediate
Butyl isocyanate serves as a key intermediate in the synthesis of various organic compounds. Its reactive nature allows for the introduction of the isocyanate functional group into diverse molecular structures, facilitating the creation of amides, ureas, and carbamates.
Reagent in Chemical Research
In laboratory settings, butyl isocyanate functions as a reagent for specific chemical transformations. It is employed in research and development to explore new synthetic pathways and to prepare novel chemical entities for further investigation.
Building Block for Specialty Chemicals
This compound acts as a fundamental building block for the production of specialty chemicals. The incorporation of the butyl group along with the isocyanate functionality enables the design and synthesis of materials with tailored properties.
| Molecular weight | 99.13 |
|---|---|
| Linear formula | CH3(CH2)3NCO |
| Assay | 98% |
| Boiling point | 115 °C(lit.) |
| Density | 0.88 g/mL at 25 °C(lit.) |
| Refractive index | n20/D 1.406(lit.) |
| Vapour pressure | 10.6 mmHg (20 °C) |
| Vapour density | 3 (vs air) |




Hazard statements
- H225Highly flammable liquid and vapour
- H302Harmful if swallowed
- H311Toxic in contact with skin
- H314Causes severe skin burns and eye damage
- H330Fatal if inhaled
- H334May cause allergy or asthma symptoms if inhaled
Precautionary statements
- P210Keep away from heat, sparks and open flames. No smoking
- 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 | Faceshields, full-face respirator (US), Gloves, Goggles, multi-purpose combination respirator cartridge (US), type ABEK (EN14387) respirator filter |
|---|---|
| Flash point | 11 °C / 51.8 °F |
| Transport (UN / ADR) | UN 2485 3(6.1) / PGI |
| Water hazard class (WGK, DE) | 1 |
| Hazard codes (EU) | F,T+ |
| Risk statements (R) | 11-21/22-26-34-37-42/43 |
| Safety statements (S) | 23-26-28-36/37/39-45 |
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 Butyl isocyanate used for?
+
Butyl isocyanate is primarily used as an intermediate and building block in organic synthesis and chemical research for creating amides, ureas, and carbamates, as well as specialty chemicals.
What are the CAS number and chemical formula for Butyl isocyanate?
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The CAS number for Butyl isocyanate is 111-36-4, and its chemical formula is CH3(CH2)3NCO.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies Butyl isocyanate with an assay of 98%. We do not represent this product as USP, BP, or EP grade.
How should Butyl isocyanate be handled safely?
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Butyl isocyanate is a highly hazardous substance. It is flammable and toxic, causing severe skin burns and eye damage, and may cause allergy or asthma symptoms or breathing difficulties if inhaled. Always handle with extreme caution using appropriate personal protective equipment, including a full-face respirator, gloves, and goggles, in a well-ventilated area.
How is Butyl isocyanate packed, shipped, and exported?
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Butyl isocyanate is packed, shipped, and exported in accordance with stringent international regulations for hazardous materials. Please contact us for specific details regarding packaging and shipping options for your region.
How can I request a quote or sample for Butyl isocyanate?
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To request a quote or sample for Butyl isocyanate, please use the contact form on our website or reach out to our sales department directly. Our team will be happy to assist you with your requirements.
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