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Chemical product profile

HONGKUN / PRODUCT DIRECTORY

4-Methyl-6-(1-methyl-1H-benzimidazol-2-yl)-2-propyl-1H-benzimidazole | CAS 152628-02-9

A linked benzimidazole fragment documented in telmisartan synthesis and impurity analysis, with ring connectivity and nitrogen substitution determining whether a proposed material matches the required intermediate or analytical reference.

CAS152628-02-9
Molecular formulaC19H20N4
Molecular weight304.4 g/mol

Product overview

Two linked benzimidazole rings, a propyl group and distinct ring-methyl and N-methyl substituents define this telmisartan fragment. A remaining nitrogen site enables further substitution. Its use as a synthetic input or telmisartan impurity A calls for different analytical priorities: related-substance control for processing and assigned content for quantitative reference work.

Chemical identity

Chemical name
4-Methyl-6-(1-methyl-1H-benzimidazol-2-yl)-2-propyl-1H-benzimidazole
CAS number
152628-02-9
Molecular formula
C19H20N4
Molecular weight
304.4 g/mol

Application context

Telmisartan route chemistry uses the available benzimidazole nitrogen to attach a bromomethyl biphenyl carboxylate, forming a telmisartan ester intermediate. The compound also has an analytical role as telmisartan impurity A. For synthesis, prioritize positional identity and relevant heterocyclic impurities; for quantitative impurity analysis, specify assigned content and characterization appropriate to the method.

Chemistry and synthetic role

Two linked benzimidazole rings carry distinct carbon-bound and nitrogen-bound methyl groups. The remaining unsubstituted nitrogen is the attachment site for the biphenylmethyl fragment in telmisartan assembly.

Quality review

Resolve naming and ring positions

Match the full structure across bibenzimidazole and benzimidazolyl naming conventions, including the N-methyl position.

Define synthesis versus reference use

For quantitative impurity analysis, agree the assigned content, its calculation basis and characterization needed by the method. For synthesis, define assay and route-related impurities.

Review the nitrogen-substitution profile

Evaluate related heterocycles and positional isomers with a method capable of distinguishing those relevant to the intended route.

Preparing a specification

Include CAS, a structure drawing or verified structural identifier, the intended use and the required assay basis. For process input, identify critical related substances; for impurity analysis, specify value assignment and reference-material documentation needs.

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 structural identification and the related-substance method. If quantitative impurity testing is intended, confirm the availability of assigned-content information, supporting calculations and traceable batch documentation, alongside COA and SDS.

Procurement questions

Are the two naming styles different products?

Not necessarily. Bibenzimidazole and benzimidazolyl names can describe this same structure; check the full connectivity and substitution.

What is needed for quantitative impurity A analysis?

Request an assigned content, its calculation basis and characterization suitable for the analytical method.

What nitrogen feature matters in synthesis?

The unsubstituted nitrogen site used to introduce the biphenylmethyl fragment must match the verified structure.

Technical sources
  1. PubChem CID 9796488: properties and CAS synonym crosscheckNCBI / PubChem
  2. 1,7'-Dimethyl-2'-propyl-2,5'-bibenzimidazole — D5079Tokyo Chemical Industry
  3. WO2010018441A2: An improved process for the preparation of substantially pure telmisartanPatent publication / Google Patents
  4. CN110836943A — Analysis method for impurity detection of telmisartan tablets and capsulesPatent publication / Google Patents