Methyl isocyanatoformate
Methyl isocyanatoformate (CAS: 5843-42-5) is an organic compound with the linear formula OCNCO₂CH₃ and a molecular weight of 101.06 g/mol. This flammable liquid serves as a valuable building block in chemical synthesis. It is a key intermediate in the production of various chemical compounds, particularly those involving nitrogen-containing heterocycles and carbamate functionalities, owing to the reactive isocyanate group.

Organic Synthesis Reagent
Methyl isocyanatoformate is extensively employed as a reagent in organic synthesis, facilitating the introduction of the methoxycarbonylamino group into molecules. Its reactivity makes it suitable for the preparation of complex organic structures and intermediates.
Pharmaceutical Intermediate
This compound serves as a critical intermediate in the synthesis pathways for various pharmaceutical agents. It is utilized in the construction of nitrogen-containing heterocyclic systems common in drug discovery and development.
Material Science
The isocyanate functionality allows for its incorporation into polymers and other advanced materials. It can react with nucleophiles to form linkages, contributing to the development of specialized polymers.
| Molecular weight | 101.06 |
|---|---|
| Linear formula | OCNCO2CH3 |
| Assay | 90% |
| Boiling point | 97 °C(lit.) |
| Density | 1.251 g/mL at 25 °C(lit.) |
| Refractive index | n20/D 1.413(lit.) |
| Storage temperature | −20°C |



Hazard statements
- H226Flammable liquid and vapour
- 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 | 31 °C / 87.8 °F |
| Transport (UN / ADR) | UN 1993C 3 / PGIII |
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | Xn |
| Risk statements (R) | 10-20/21/22-36/37/38-42 |
| Safety statements (S) | 16-26-36/37 |
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 Methyl isocyanatoformate used for?
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Methyl isocyanatoformate is primarily used as a building block in organic synthesis and as an intermediate in the production of pharmaceuticals and other complex chemicals. It is valuable for introducing specific functional groups into molecules.
What are the CAS number and formula for Methyl isocyanatoformate?
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The CAS number for Methyl isocyanatoformate is 5843-42-5, and its linear formula is OCNCO₂CH₃.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies Methyl isocyanatoformate with an assay of 90%. We do not represent this product as USP, BP, or EP grade.
How should Methyl isocyanatoformate be handled safely?
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Methyl isocyanatoformate is a flammable liquid and a health hazard. Handle it with appropriate personal protective equipment, including eyeshields, face shields, gloves, and a suitable respirator, in a well-ventilated area. Avoid ignition sources and inhalation of vapours.
How is Methyl isocyanatoformate packed and exported?
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Methyl isocyanatoformate is shipped as UN 1993, Class 3, Packing Group III. TSS is a specialist global supplier and exporter of fine chemicals, ensuring compliant packaging and export procedures.
How can I request a quote or sample for Methyl isocyanatoformate?
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To request a quote or sample for Methyl isocyanatoformate, please contact our sales team through the website or by phone, providing your specific requirements.
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