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Chemical product profile

HONGKUN / PRODUCT DIRECTORY

4-Chloro-3-(trifluoromethyl)phenyl isocyanate | CAS 327-78-6

A substituted aryl isocyanate documented as the urea-forming partner in sorafenib synthesis, where the NCO group and the chloro/trifluoromethyl substitution pattern define the required coupling fragment.

CAS327-78-6
Molecular formulaC8H3ClF3NO
Molecular weight221.56 g/mol

Product overview

The Ar–N=C=O group makes this aromatic compound a urea-forming partner. Chlorine at position 4 and trifluoromethyl at position 3 specify the aryl fragment used in sorafenib chemistry. Review the NCO identity and chemical-content basis together with a chromatographic profile suited to the intended coupling.

Chemical identity

Chemical name
4-Chloro-3-(trifluoromethyl)phenyl isocyanate
CAS number
327-78-6
Molecular formula
C8H3ClF3NO
Molecular weight
221.56 g/mol

Application context

In a reported sorafenib synthesis, this aryl isocyanate reacts with an aminophenoxy pyridinecarboxamide fragment to form the urea linkage. It contributes the specified chloro/trifluoromethyl-substituted aryl group and NCO function. Qualification should combine reactive-group identification with a defined assay basis and process-relevant separation of the corresponding aniline or urea-related compounds.

Chemistry and synthetic role

An isocyanate has the connectivity Ar–N=C=O. Its reaction with an appropriate amine supplies a urea linkage, explaining the documented sorafenib route connection. The aryl substitution pattern is equally part of the identity: a different chloro or trifluoromethyl position would provide a different coupling fragment.

Quality review

Verify the NCO functionality

Use identity evidence that supports the isocyanate group as well as the substituted aromatic structure; the corresponding aniline is not an equivalent starting material.

Define content separately from area purity

Specify the quantitative assay, its calculation basis and its use in charge calculations. Report chromatographic area purity separately with the corresponding related-substance method.

Review aniline and urea-related separation

Select relevant aniline and urea-related analytes from the actual preparation and receiving process, then confirm their separation and agree acceptance limits.

Preparing a specification

Include CAS 327-78-6, the 4-chloro/3-trifluoromethyl substitution pattern, an identity requirement supporting NCO, and the agreed assay basis. Define any process-related aniline or urea controls with the proposed manufacturer and confirm sampling requirements.

Packaging and storage

Agree packaging, net weight and transport arrangements for the selected grade, quantity and destination. Confirm storage and handling conditions using the current SDS for the proposed material.

Documentation

Request structure-identification data, a batch COA and the assay method or an adequate method summary. Confirm availability of chromatographic evidence for agreed related compounds and obtain the actual supplier’s SDS for sampling, storage and transport requirements.

Procurement questions

Is this the same material as the corresponding aniline?

No. The NCO and amino groups are different functional states and have different roles in synthesis.

Why does the aromatic substitution pattern matter?

The published sorafenib coupling requires the specified aryl fragment; moving chlorine or trifluoromethyl changes its identity.

Can HPLC area purity be used as the dosing assay?

Only if that interpretation is established by the agreed analytical method. Area purity and quantitative chemical content are not automatically equivalent.

Technical sources
  1. PubChem CID 2733265 — structure propertiesPubChem / NCBI
  2. PubChem CID 2733265 — CAS and synonymsPubChem / NCBI
  3. 4-Chloro-3-(trifluoromethyl)phenyl isocyanate, 374881Sigma-Aldrich
  4. US8445687B2 — Process for the preparation of a RAF kinase inhibitor and intermediates for use in the processPatent applicant via Google Patents