4-Formyl-3-methylbenzoic Acid: Properties, Uses & Applications

4-Formyl-3-methylbenzoicacid is a bifunctional aromatic compound bearing both an aldehyde and a carboxylic acid group on a methyl-substituted benzene ring, making it a versatile building block for organic synthesis and pharmaceutical research.

Chemical Name

4-Formyl-3-methylbenzoic acid

SKU

F692381

Molecular Formula

C₉H₈O₃

Key Functional Groups

Aldehyde (–CHO) and Carboxylic Acid (–COOH)

Compound Class

Aromatic bifunctional carboxaldehyde

Primary Use

Organic synthesis building block and research reagent

Chemical Structure and Properties

4-Formyl-3-methylbenzoic acid (CAS-based systematic name) is an aromatic compound with the molecular formula C₉H₈O₃. Its structure features a benzene ring substituted with a methyl group at the 3-position, an aldehyde group (–CHO) at the 4-position, and a carboxylic acid group (–COOH) at the 1-position. This arrangement of two reactive functional groups on a single aromatic scaffold imparts significant synthetic utility.

The carboxylic acid moiety confers acidic character and the ability to form amide, ester, and anhydride derivatives, while the aldehyde group participates in condensation reactions, reductive aminations, and the formation of imines (Schiff bases). The methyl substituent at the 3-position introduces steric and electronic effects that influence the reactivity of both functional groups, making this compound a uniquely tunable intermediate.

Applications in Organic Synthesis

Due to its dual functionality, 4-Formyl-3-methylbenzoic acid serves as a valuable building block in multi-step organic synthesis. The aldehyde group can be exploited in Knoevenagel condensations, Wittig reactions, and reductive amination protocols to introduce carbon–carbon or carbon–nitrogen bonds, while the carboxylic acid enables coupling reactions with amines or alcohols to generate amide or ester linkages.

This compound is particularly relevant in the synthesis of heterocyclic scaffolds, where both functional groups can react simultaneously or sequentially to form ring systems including benzimidazoles, oxazoles, and related nitrogen- or oxygen-containing heterocycles. Such scaffolds are widely encountered in medicinal chemistry programs aimed at developing bioactive small molecules.

In materials science and supramolecular chemistry, bifunctional aromatic acids and aldehydes are employed as linkers in metal-organic frameworks (MOFs) and covalent organic frameworks (COFs), where controlled coordination or covalent bond formation at two distinct sites is desired.

Handling, Storage, and Safety Considerations

As with most aromatic aldehyde-acid compounds, 4-Formyl-3-methylbenzoic acid should be handled with standard laboratory precautions. Users are advised to wear appropriate personal protective equipment (PPE), including nitrile gloves, safety glasses, and a laboratory coat, when handling this reagent.

The compound should be stored in a cool, dry, well-ventilated location, away from strong oxidizing agents and bases. Containers should be kept tightly sealed to prevent moisture uptake and oxidation of the aldehyde functionality, which can lead to formation of the corresponding carboxylic acid and reduce reagent purity over time.

Researchers should consult the Safety Data Sheet (SDS) provided by Aladdin Scientific for complete hazard classifications, first-aid measures, and disposal guidelines specific to this compound (SKU F692381) prior to use.

Relevance in Pharmaceutical and Medicinal Chemistry Research

Aromatic compounds bearing aldehyde and carboxylic acid groups are frequently encountered as precursors in the synthesis of pharmacologically active molecules. The combination of the –CHO and –COOH groups on 4-Formyl-3-methylbenzoic acid allows medicinal chemists to rapidly diversify molecular libraries through parallel synthesis strategies.

The methyl group at the 3-position provides an additional handle for structure-activity relationship (SAR) studies, introducing hydrophobicity and steric bulk that can modulate binding interactions with biological targets. This makes 4-Formyl-3-methylbenzoic acid a useful fragment or intermediate in hit-to-lead and lead optimization campaigns.

Additionally, Schiff base derivatives formed from the aldehyde group have been broadly investigated for a range of biological activities including antimicrobial, anticancer, and anti-inflammatory properties, further underscoring the research value of this class of bifunctional aromatic intermediates.

Frequently asked questions

What functional groups are present in 4-Formyl-3-methylbenzoic acid?

4-Formyl-3-methylbenzoic acid contains two key functional groups: an aldehyde group (–CHO) at the 4-position and a carboxylic acid group (–COOH) at the 1-position of the methyl-substituted benzene ring. This bifunctionality makes it a highly versatile reagent in organic synthesis.

What are the main applications of 4-Formyl-3-methylbenzoic acid in research?

This compound is primarily used as a bifunctional building block in organic synthesis, enabling the formation of amides, esters, imines, and heterocyclic ring systems. It is also relevant in pharmaceutical research for the preparation of biologically active small-molecule derivatives and in materials science as a linker component for framework materials.

How should 4-Formyl-3-methylbenzoic acid (SKU F692381) be stored?

The compound should be stored in a tightly sealed container in a cool, dry, and well-ventilated area, away from strong oxidants and bases. Proper sealing is important to prevent oxidation of the aldehyde group and moisture uptake, which could compromise purity. Always refer to the Aladdin Scientific SDS for specific storage conditions.

Can 4-Formyl-3-methylbenzoic acid be used to synthesize Schiff base derivatives?

Yes, the aldehyde functional group of 4-Formyl-3-methylbenzoic acid readily reacts with primary amines under mild conditions to form imine (Schiff base) linkages. Schiff base derivatives of aromatic aldehydes have been widely studied for potential antimicrobial, anticancer, and anti-inflammatory activities.

References

1. March, J. Advanced Organic Chemistry: Reactions, Mechanisms, and Structure. Wiley-Interscience. General reference for aldehyde and carboxylic acid reactivity.
2. Clayden, J.; Greeves, N.; Warren, S. Organic Chemistry. Oxford University Press. Reference for bifunctional aromatic compound reactivity and synthetic utility.
3. Aladdin Scientific product listing: 4-Formyl-3-methylbenzoic acid, SKU F692381.

Products are supplied for research and development use only. Not for use in humans, animals, diagnosis, or therapy.