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Chemical product profile

HONGKUN / PRODUCT DIRECTORY

7-Chloroquinaldine | CAS 4965-33-7

A 7-chloroquinoline scaffold carrying a methyl group at C2, appearing in published montelukast intermediate chemistry. Separation from 5-chloroquinaldine is a particularly relevant raw-material qualification point.

CAS4965-33-7
Molecular formulaC10H8ClN
Molecular weight177.63 g/mol

Product overview

Quinaldine denotes the 2-methylquinoline skeleton; in this product, chlorine is located at the 7-position of the fused benzene ring. Both features matter when selecting the quinoline fragment for a downstream route. Published preparation work discusses the 5-chloro positional isomer as a separation challenge, making its analytical resolution a useful specification topic. The material is the free quinoline base rather than a named salt or a later functionalised montelukast intermediate. Buyers should confirm the structural identification, a suitable GC or HPLC profile and any route-critical positional-isomer limit. Reference handling information also identifies light sensitivity, which should be considered when arranging samples and storage.

Chemical identity

Chemical name
7-Chloroquinaldine
CAS number
4965-33-7
Molecular formula
C10H8ClN
Molecular weight
177.63 g/mol

Application context

7-Chloroquinaldine is described in published routes associated with montelukast synthesis. It supplies the quinoline framework with chlorine already positioned at C7 and a methyl substituent at C2 for subsequent elaboration. The required starting structure should be matched to the buyer’s route because later quinoline intermediates carry different functionality.

Qualification is especially concerned with positional purity. A method that separates the 7-chloro compound from 5-chloroquinaldine helps control an isomer that can arise in preparation of the scaffold. Discuss the reporting limit for that component, the other related quinolines to be monitored and the basis of the main-component result.

Chemistry and synthetic role

The fused quinoline ring contains a basic ring nitrogen. Its C2 methyl group and C7 aryl chloride define different sites on the scaffold and must both be preserved in the identity assignment.

Quality review

Resolve 5-chloroquinaldine

Confirm that the analytical method separates the 5- and 7-chloro positional isomers.

Confirm the methyl-bearing free base

Match C2 methyl substitution and exclude confusion with salts or later oxidised quinoline intermediates.

Review the related-quinoline profile

Agree main-component assay and limits for route-relevant quinolines with adequate reporting sensitivity.

Preparing a specification

Specify 7-chloro-2-methylquinoline as the free base, the assay method and a dedicated 5-chloroquinaldine criterion. Include additional related quinolines and residual solvents according to the proposed route.

Packaging and storage

Reference handling information: TCI identifies light sensitivity. Confirm light-protective handling, closure and package size for the selected material; storage and transport follow the actual supplier SDS.

Documentation

Request a batch COA, specification, identity data and SDS. Confirm the availability of the analytical methods and any application-specific impurity results with the proposed supplier.

Procurement questions

What does quinaldine mean here?

It identifies a quinoline carrying a methyl group at C2. The chlorine in this product is at C7.

Why is the 5-chloro isomer important?

Published preparation routes identify it as a positional by-product requiring separation.

Is this a finished montelukast intermediate with the side chain installed?

This entry identifies the methyl-bearing quinoline starting scaffold; compare the full structure with the required route stage.

Technical sources
  1. 7-Chloroquinaldine C1453TCI
  2. 7-Chloroquinaldine CID 138395PubChem
  3. Synthesis method of 7-chloroquinaldineCN108822033B