Phenyl isocyanate
Phenyl isocyanate (CAS: 103-71-9, Formula: C6H5NCO) is a reactive organic compound with a molecular weight of 119.12 g/mol. Characterised by its pungent odour, this clear, colourless to pale yellow liquid is a vital intermediate in organic synthesis. It is primarily utilised in the production of pharmaceuticals, agrochemicals, and polymers. Its high reactivity makes it a key building block for introducing the phenylcarbamoyl group into various molecular structures.

Pharmaceutical Synthesis
Phenyl isocyanate serves as a crucial reagent in the synthesis of various active pharmaceutical ingredients (APIs). It is used to create carbamate linkages, which are present in numerous drug molecules.
Agrochemical Production
This compound is employed in the manufacture of pesticides and herbicides. Its reactivity allows for the efficient synthesis of complex agrochemical structures, contributing to crop protection.
Polymer and Material Science
Phenyl isocyanate is a building block for specific types of polymers and resins. It can be used in the development of advanced materials requiring tailored properties.
Organic Synthesis Intermediate
As a versatile organic building block, it is extensively used in research and development for creating novel organic compounds and exploring new synthetic pathways.
| Molecular weight | 119.12 |
|---|---|
| Linear formula | C6H5NCO |
| Assay | ≥98% |
| Boiling point | 162-163 °C(lit.) |
| Density | 1.096 g/mL at 25 °C(lit.) |
| Refractive index | n20/D 1.535(lit.) |
| Vapour pressure | 1.4 mmHg (20 °C) |
| Melting point | −30 °C(lit.) |
| Storage temperature | 2-8°C |




Hazard statements
- H226Flammable liquid and vapour
- H302Harmful if swallowed
- H314Causes severe skin burns and eye damage
- H317May cause an allergic skin reaction
- H330Fatal if inhaled
- H334May cause allergy or asthma symptoms if inhaled
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 | Faceshields, full-face respirator (US), Gloves, Goggles, multi-purpose combination respirator cartridge (US), type ABEK (EN14387) respirator filter |
|---|---|
| Flash point | 51 °C / 123.8 °F |
| Transport (UN / ADR) | UN 2487 3(6.1) / PGI |
| Water hazard class (WGK, DE) | 2 |
| Hazard codes (EU) | T+ |
| Risk statements (R) | 10-22-26-34-42-52 |
| Safety statements (S) | 16-26-28-36/37/39-45 |
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 Phenyl isocyanate used for?
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Phenyl isocyanate is primarily used as an intermediate in the synthesis of pharmaceuticals, agrochemicals, and polymers. It acts as a key building block in organic synthesis for introducing the phenylcarbamoyl group.
What are the CAS number and formula for Phenyl isocyanate?
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The CAS number for Phenyl isocyanate is 103-71-9, and its chemical formula is C6H5NCO.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies Phenyl isocyanate with an assay of ≥98%. We do not represent this product as USP, BP, EP, or other pharmacopoeia grades unless explicitly stated.
How should Phenyl isocyanate be handled safely?
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Phenyl isocyanate is a dangerous substance. It is flammable, corrosive, and toxic. Handle with extreme care, wearing appropriate personal protective equipment including a full-face respirator, chemical-resistant gloves, and goggles. Ensure adequate ventilation and avoid contact with skin, eyes, and inhalation. Refer to the Safety Data Sheet for detailed handling procedures.
Is Phenyl isocyanate regulated or a controlled substance?
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Phenyl isocyanate is not listed as a controlled substance in the provided data. However, its hazardous nature requires strict adherence to safety protocols during handling and transport.
How is Phenyl isocyanate packed and exported?
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Phenyl isocyanate is typically packed in compliance with international regulations for hazardous materials. Tech Serve Solutions exports this chemical globally, adhering to all necessary shipping and customs requirements.
How can I request a sample or quote for Phenyl isocyanate?
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To request a sample or quote for Phenyl isocyanate, please contact our sales team through the website or by phone, providing your specific requirements.
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