4-Butylphenyl isocyanate
4-Butylphenyl isocyanate (CAS 69342-47-8), with the molecular formula CH3(CH2)3C6H4NCO and a molecular weight of 175.23 g/mol, is an organic building block and isocyanate compound. It serves as a key intermediate in various chemical synthesis pathways. This compound is valued for its reactivity, enabling the formation of new chemical bonds and the creation of more complex molecules in research and industrial applications.

Chemical Synthesis Intermediate
4-Butylphenyl isocyanate is primarily used as a versatile building block in organic synthesis. Its isocyanate functional group readily reacts with nucleophiles, facilitating the construction of diverse organic structures.
Polymer and Materials Science
This compound can be employed in the development of novel polymers and materials. Its incorporation can introduce specific chemical properties or functionalities into polymer chains, influencing material characteristics.
Pharmaceutical Intermediate Research
In pharmaceutical research, 4-Butylphenyl isocyanate may be utilised as a precursor for synthesising potential drug candidates or intermediates. Its structure allows for modification into various biologically active molecules.
| Molecular weight | 175.23 |
|---|---|
| Linear formula | CH3(CH2)3C6H4NCO |
| Assay | 97% |
| Boiling point | 108 °C/3 mmHg(lit.) |
| Density | 0.992 g/mL at 25 °C(lit.) |
| Refractive index | n20/D 1.517(lit.) |

Hazard statements
- H302Harmful if swallowed
- H312Harmful in contact with skin
- H315Causes skin irritation
- H319Causes serious eye irritation
- H332Harmful 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
| Protective equipment | Eyeshields, Faceshields, full-face respirator (US), Gloves, multi-purpose combination respirator cartridge (US), type ABEK (EN14387) respirator filter |
|---|---|
| Flash point | 108 °C / 226.4 °F |
| Transport (UN / ADR) | UN 2206 6.1/PG 3 |
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | Xn |
| Risk statements (R) | 20/21/22-36/37/38 |
| Safety statements (S) | 23-26-36 |
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-Butylphenyl isocyanate used for?
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4-Butylphenyl isocyanate is primarily used as a versatile building block in organic synthesis and may find applications in polymer science and pharmaceutical intermediate research due to the reactivity of its isocyanate group.
What is the CAS number and molecular formula for 4-Butylphenyl isocyanate?
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The CAS number for 4-Butylphenyl isocyanate is 69342-47-8, and its molecular formula is CH3(CH2)3C6H4NCO.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies 4-Butylphenyl isocyanate with an assay of 97%. We do not represent this product as USP, BP, or EP grade.
How should 4-Butylphenyl isocyanate be handled safely?
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4-Butylphenyl isocyanate is classified as Warning, with hazards including H302, H312, H315, H319, H332, and H335. Appropriate personal protective equipment such as eyeshields, faceshields, gloves, and suitable respiratory protection (e.g., full-face respirator or type ABEK respirator filter) is required. Handle in a well-ventilated area.
How is 4-Butylphenyl isocyanate packed and shipped?
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4-Butylphenyl isocyanate is shipped as UN 2206, Hazard Class 6.1, Packing Group III. Specific packaging details are available upon request.
How can I request a quote or sample for 4-Butylphenyl isocyanate?
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To request a quote or sample for 4-Butylphenyl isocyanate, please contact our sales department through the website or via direct inquiry.
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