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Chemical product profile

HONGKUN / PRODUCT DIRECTORY

3-Nitrobenzaldehyde | CAS 99-61-6

The meta-nitrophenyl aldehyde component used in published dihydropyridine routes, including nicardipine and nitrendipine, where the aromatic substitution pattern must be retained through ring construction.

CAS99-61-6
Molecular formulaC7H5NO3
Molecular weight151.12 g/mol

Product overview

Dihydropyridine synthesis can draw its aryl substituent from 3-nitrobenzaldehyde. The aldehyde group provides the condensation site, and the nitro group fixes the meta-substituted aromatic pattern carried into the resulting framework. This is a different building block from 2-nitrobenzaldehyde and 4-nitrobenzaldehyde, even though all three share a molecular formula. CAS 99-61-6 should therefore accompany the full name in purchasing and analytical records. For qualification, a general purity statement is less useful than an agreed aldehyde assay and a chromatogram resolving relevant nitroaromatic substances. Water and the corresponding carboxylic acid are additional points to review where the downstream condensation requires consistent raw-material composition.

Chemical identity

Chemical name
3-Nitrobenzaldehyde
CAS number
99-61-6
Molecular formula
C7H5NO3
Molecular weight
151.12 g/mol

Application context

Published nicardipine processes combine 3-nitrobenzaldehyde with acetoacetate-derived partners to construct a substituted dihydropyridine ring. Nitrendipine process literature also uses this aldehyde as the source of the meta-nitrophenyl substituent. Its role is to supply a defined aromatic fragment and reactive carbonyl group during heterocycle assembly. The nitro group remains part of the downstream structure in these examples. Raw-material qualification should consequently focus on the correct substitution pattern and on impurities that may enter the same condensation chemistry. The product is a synthetic input; the analytical requirements of a finished active ingredient do not automatically describe this starting material.

Chemistry and synthetic role

The formyl group and nitro group occupy positions 1 and 3 of the aromatic ring. Carbonyl condensation builds the downstream heterocycle while preserving the meta-nitrophenyl fragment.

Quality review

Verify the meta arrangement

Use identity data that distinguish 3-nitrobenzaldehyde from the two other positional isomers.

Separate aldehyde and acid

Ask whether the related-substance method resolves 3-nitrobenzoic acid as well as other nitroaromatic components.

Review water for condensation use

Set a water criterion where the selected condensation route is sensitive to changing feed composition.

Preparing a specification

Request CAS 99-61-6 with the required aldehyde assay, a method resolving positional isomers and relevant acid impurities, and water or residual-solvent limits appropriate to the intended route.

Packaging and storage

Packaging, closure and net weight are agreed for the selected grade, order quantity and destination. Confirm storage and transport requirements against 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

Why is the position of the nitro group critical?

The aromatic substitution pattern is transferred into the dihydropyridine product; a different isomer is a different building block.

Is this an active pharmaceutical ingredient?

Its role here is a starting material in published synthetic routes for downstream active ingredients.

Which acid should be considered in impurity review?

Review the corresponding 3-nitrobenzoic acid where relevant to the manufacturing and storage history.

Technical sources
  1. 3-Nitrobenzaldehyde N10845Sigma-Aldrich
  2. Process for preparing nicardipineEuropean Patent Office
  3. Process for preparing nitrendipineEuropean Patent Office