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2-Methyl-4-nitrobenzoic acid is an organic compound with the chemical formula C₈H₇NO₄. Structurally, it features a benzene ring substituted with a methyl group at the 2-position and a nitro group at the 4-position, along with a carboxylic acid group. This compound is a derivative of benzoic acid, modified to include both nitro and methyl substituents, which significantly influence its chemical properties and reactivity.
It is often utilized as an intermediate in the synthesis of pharmaceuticals, dyes, and agrochemicals. Its nitro group can be reduced to an amino group, facilitating further functionalization and the creation of complex molecular architectures. Due to its reactivity and versatility, this compound serves as a valuable building block in organic chemistry research and industrial applications.
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Chemical Formula |
C8H7NO4 |
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Exact Mass |
181.04 |
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Molecular Weight |
181.15 |
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m/z |
181.04 (100.0%), 182.04 (8.7%) |
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Elemental Analysis |
C, 53.04; H, 3.90; N, 7.73; O, 35.33 |
2-Methyl-4-nitrobenzoic acid is an organic compound with distinct physical properties that define its morphology. This compound, belonging to the class of nitrobenzoic acids, exhibits characteristics typical of aromatic carboxylic acids with nitro and methyl substituents.
Appearance and State: At room temperature, it typically appears as a solid. It is often observed in the form of crystalline powder or needles, depending on the conditions of its synthesis and purification. The crystalline structure is a result of the molecule's ability to form ordered, repeating patterns through intermolecular forces, particularly hydrogen bonding and van der Waals interactions.
Color: Pure product is usually off-white to pale yellow in color. The presence of impurities or variations in the manufacturing process can lead to slight discoloration, but the compound generally maintains a relatively light hue.
Odor: Like many organic acids, the compound may possess a faint, characteristic odor. However, it is not typically described as having a strong or pungent smell compared to other carboxylic acids, possibly due to the electron-withdrawing effects of the nitro group, which can influence the compound's volatility and, consequently, its odor intensity.
Solubility: This compound exhibits moderate solubility in polar solvents such as ethanol and dimethyl sulfoxide (DMSO), and it is sparingly soluble in water. The presence of the carboxylic acid group allows for hydrogen bonding with water molecules, but the hydrophobic methyl and nitro groups reduce its overall water solubility. In organic solvents, the compound's solubility is enhanced due to better interaction with the nonpolar parts of the molecule.
Melting Point: It has a relatively high melting point, which is characteristic of many aromatic compounds with strong intermolecular forces. The exact melting point can vary slightly depending on the purity of the sample but is generally in the range of 200-210°C. This high melting point reflects the compound's crystalline nature and the strong interactions between its molecules.
Stability: The compound is stable under normal storage conditions but should be kept away from strong oxidizing agents and excessive heat, as the nitro group can confer some sensitivity to these conditions.
in Organic Synthesis
Transformations of the Carboxylic Acid Group
Esterification
The carboxylic acid group can react with alcohols in the presence of an acid catalyst to form esters. These esters are valuable intermediates in the synthesis of fragrances, flavors, and pharmaceuticals, as well as in polymer chemistry.
Amidation
By reacting with amines, the carboxylic acid group can be converted into amides. Amides are important components in peptides, proteins, and various pharmaceutical agents, making this transformation particularly significant in biochemical and medicinal chemistry.
Reduction to Alcohol
The carboxylic acid group can be reduced to a primary alcohol using reducing agents such as lithium aluminum hydride (LiAlH₄) or borane (BH₃). This transformation is useful in the synthesis of alcohols, which can serve as starting materials for further functionalization.
Formation of Acid Chlorides
Treatment of the carboxylic acid with thionyl chloride (SOCl₂) or oxalyl chloride (COCl)₂ can yield acid chlorides, which are highly reactive intermediates used in the synthesis of various carboxylic acid derivatives, including esters, amides, and anhydrides.
Nitro Group Transformations
In addition to the reactivity of the carboxylic acid group, the nitro group (–NO₂) on the benzene ring can also undergo significant transformations:
Reduction to Amine
The nitro group can be reduced to an amino group (–NH₂) using reducing agents such as iron and hydrochloric acid, tin and hydrochloric acid, or catalytic hydrogenation. This transformation is crucial in the synthesis of anilines, which are important intermediates in the production of dyes, pigments, and pharmaceuticals.
Diazotization and Coupling Reactions
The amino group, obtained from the reduction of the nitro group, can be further transformed into a diazonium salt through diazotization. This diazonium salt can then undergo coupling reactions with various aromatic compounds to form azo dyes and other useful products.
Applications in the Pharmaceutical Industry
2-Methyl-4-nitrobenzoic acid serves as a key aromatic intermediate in the pharmaceutical field, mainly used to construct the core skeletons of various active pharmaceutical molecules. The carboxyl and nitro groups in the molecule can be derivatized separately, and the amino derivative obtained by reduction of the nitro group is a critical precursor for the preparation of various heterocyclic drugs.
This compound is frequently employed in the synthesis of kinase inhibitors, antibacterial and anti-inflammatory drugs, where coupling with different side chains modulates the lipophilicity, target affinity, and metabolic stability of the drug. Its structurally modified derivatives can also act as building blocks for antihistamines, local anesthetics, and some cardiovascular drugs. In medicinal chemistry research, it is used for lead compound optimization and candidate molecule preparation. Owing to its stable benzene ring skeleton and convertible functional groups, it holds high application value in new drug research and development as well as API manufacturing.
Applications in the Agrochemical Industry
In the agrochemical sector, 2-methyl-4-nitrobenzoic acid is an important raw material for the production of high-efficiency insecticides, fungicides, and herbicides. Its carboxyl group can form active intermediates such as acyl chlorides and amides, and conjugation with heterocyclic structures significantly improves the biological activity and environmental safety of agrochemicals.
This compound is commonly used in the synthesis of pyrethroid and amide insecticides, which show excellent inhibitory effects on piercing-sucking mouthpart pests. It can also act as an intermediate for sulfonylurea and aryloxyphenoxypropionate herbicides, achieving selective weed control by interfering with key metabolic enzymes in weeds. In addition, its derivatives are applied in the development of agricultural fungicides, inhibiting the mycelial growth and spore germination of pathogenic fungi and enhancing the efficacy of crop disease control.
Applications in Dyes and Organic Pigments
2-Methyl-4-nitrobenzoic acid is mainly used as a chromophoric unit and structural modification intermediate in the dye and organic pigment industry. Reduction of the nitro group yields the corresponding aminobenzoic acid, which can further undergo diazotization and coupling reactions to produce various azo dyes, acid dyes, and disperse dyes.
Introduction of methyl and carboxyl groups effectively improves the solubility, dyeing rate, and color fastness of dyes, resulting in bright-colored finished products with excellent light resistance and washability. Its derivatives are also used for molecular modification of organic pigments, enhancing their thermal stability, dispersibility, and tinting strength. They are widely applied in textile printing and dyeing, leather coloring, plastic and coating coloration, making them indispensable intermediates for the synthesis of functional dyes and high-performance pigments.
Applications in Materials and Polymer Science
In materials and polymer science, 2-methyl-4-nitrobenzoic acid is mainly used as a functional monomer and polymer modifier, participating in the synthesis and modification of polyesters, polyamides, epoxy resins, and other materials.Its carboxyl group can undergo polycondensation with polyols and amines, introducing rigid benzene rings and nitro groups into the polymer backbone, thereby increasing the glass transition temperature, mechanical strength, and weather resistance of the material.
Derivatives of this compound can also serve as crosslinking agents and curing auxiliaries, improving the molding processability and thermal-oxidative aging resistance of resins. Meanwhile, its nitro-containing aromatic structure has attracted attention in optoelectronic functional materials research, with potential uses in the preparation of photosensitive polymers, liquid crystal intermediates, and charge transport materials, showing promising application prospects in specialty functional polymers and fine chemical materials.
Environmental Considerations
As a nitro-containing organic acid, 2-Methyl-4-nitrobenzoic acid poses significant hazards to aquatic environments. It is crucial to handle and dispose of this compound properly to prevent undiluted or large quantities from entering groundwater, waterways, or sewage systems.
The compound's nitro group and organic acid nature make it potentially harmful to aquatic life. If released into the environment, it could disrupt the ecological balance and pose risks to aquatic organisms. Therefore, strict measures should be taken to ensure that:
Storage: The compound should be stored in sealed containers in a cool, dry place, away from moisture and direct sunlight. It is recommended to store it under an inert gas atmosphere to maintain its stability and prevent any potential leaks or spills.
Handling: When handling it, appropriate personal protective equipment (PPE) should be worn to avoid skin and eye contact. It is also important to avoid inhaling the dust or vapor of the compound.
Disposal: The compound should be disposed of in accordance with local regulations and guidelines for hazardous waste. It should never be poured down the drain or released into the environment without proper treatment.
By following these precautions, the potential environmental hazards associated with it can be minimized, ensuring the safety of aquatic ecosystems and the broader environment.
One of the key developments in the research of 2-methyl-4-nitrobenzoic acid has been the exploration of its synthetic routes. The most common method involves the selective oxidation of 4-nitro-o-xylene under alkaline, high-temperature, and high-pressure conditions. This process selectively oxidizes the methyl group at the para-position of the nitro group to a carboxyl group, while leaving the meta-position methyl group unaffected. The high regioselectivity of this reaction is attributed to the strong electron-withdrawing nature of the nitro group, which enhances the reactivity of the para-position.
Another significant aspect of the research has been the study of its chemical properties and reactivity. The compound's carboxyl group can be converted into a range of active functional groups, such as hydroxyl and ester groups, through various chemical reactions. Additionally, the nitro group on the benzene ring can be easily reduced to an amino group, further expanding the compound's synthetic utility.
In recent years, there has been a growing interest in the environmental impact. As a nitro-containing organic acid, it poses a significant hazard to aquatic environments. Therefore, proper handling and disposal of the compound are crucial to minimize its environmental footprint.
Despite these advancements, the research on 2-methyl-4-nitrobenzoic acid is ongoing. Scientists continue to explore new synthetic routes, study its reactivity with various reagents, and investigate its potential applications in diverse fields such as pharmaceuticals, agrochemicals, and materials science.
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