4-tert-Butylphenyl isocyanate
4-tert-Butylphenyl isocyanate (CAS 1943-67-5) is an organic compound with the linear formula (CH3)3CC6H4NCO and a molecular weight of 175.23 g/mol. As a reactive isocyanate, it serves as a valuable building block in organic synthesis. It is typically used in chemical research and development for the creation of novel compounds and materials, particularly within the pharmaceutical and polymer industries.

Organic Synthesis Intermediate
4-tert-Butylphenyl isocyanate is employed as a key intermediate in the synthesis of various organic molecules. Its reactive isocyanate group readily participates in addition reactions to form ureas, carbamates, and other derivatives.
Polymer Chemistry
This compound can be utilised in the development of polymers, acting as a monomer or cross-linking agent. The incorporation of the tert-butylphenyl group can influence the physical and chemical properties of the resulting polymer.
Pharmaceutical Research
It serves as a building block for the synthesis of potential pharmaceutical agents. The isocyanate functionality allows for facile derivatisation, enabling the exploration of new drug candidates.
| Molecular weight | 175.23 |
|---|---|
| Linear formula | (CH3)3CC6H4NCO |
| Assay | 97% |
| Boiling point | 236-237 °C(lit.) |
| Density | 0.986 g/mL at 25 °C(lit.) |
| Refractive index | n20/D 1.5190(lit.) |
| Storage temperature | 2-8°C |


Hazard statements
- H302Harmful if swallowed
- H312Harmful in contact with skin
- H315Causes skin irritation
- H319Causes serious eye irritation
- H332Harmful if inhaled
- H334May cause allergy or asthma symptoms if inhaled
- H335May cause respiratory irritation
Precautionary statements
- P261Avoid breathing dust, fume, gas or vapours
- P280Wear protective gloves, clothing and eye/face protection
- P305IF IN EYES
- P342
| Protective equipment | Eyeshields, Faceshields, full-face respirator (US), Gloves, multi-purpose combination respirator cartridge (US), type ABEK (EN14387) respirator filter |
|---|---|
| Flash point | 98 °C / 208.4 °F |
| Transport (UN / ADR) | UN 3334 |
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | Xn |
| Risk statements (R) | 20/21/22-36/37/38 |
| Safety statements (S) | 26-36 |
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 4-tert-Butylphenyl isocyanate used for?
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4-tert-Butylphenyl isocyanate is used as a building block in organic synthesis, particularly for creating ureas and carbamates, and in polymer chemistry and pharmaceutical research.
What is the CAS number and molecular formula for 4-tert-Butylphenyl isocyanate?
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The CAS number is 1943-67-5 and the linear formula is (CH3)3CC6H4NCO.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies 4-tert-Butylphenyl isocyanate with an assay of 97%. This is a technical grade suitable for research and synthesis, and is not represented as USP, BP, or EP.
How should 4-tert-Butylphenyl isocyanate be handled safely?
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4-tert-Butylphenyl isocyanate is a Danger hazard. It is harmful if swallowed, in contact with skin, or if inhaled, and causes skin and serious eye irritation and respiratory irritation. Always use appropriate personal protective equipment, including eyeshields, gloves, and a suitable respirator, and handle in a well-ventilated area. Refer to the Safety Data Sheet for comprehensive handling guidelines.
Is 4-tert-Butylphenyl isocyanate a controlled substance?
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The provided data does not indicate that 4-tert-Butylphenyl isocyanate is a controlled substance.
How is 4-tert-Butylphenyl isocyanate packed, shipped, and exported?
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Tech Serve Solutions packs, ships, and exports chemicals in compliance with international regulations. Specific packaging details will be provided upon request, with UN 3334 classification noted for transport.
How can I request a quote or sample of 4-tert-Butylphenyl isocyanate?
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To request a quote or sample, please contact our sales team through the website or by phone, providing your specific requirements.
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