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3-Fluoro-4-methylaniline, also known as 4-fluoro-3-methylaniline or 3-fluoro-p-toluidine, is an organic compound belonging to the class of aromatic amines. It features a unique chemical structure where a fluorine atom and a methyl group are substituted on a benzene ring, with an amino group (-NH2) present at one of the ring positions. This molecular configuration imparts specific physical and chemical properties to the compound.
With a molecular formula of C7H8FN, it has a molecular weight of 125.14 g/mol.
It typically exists as a colorless to light yellow liquid or solid, depending on conditions, and exhibits moderate solubility in common organic solvents. The presence of the fluorine atom influences its reactivity, often enhancing its participation in various organic transformations due to its electron-withdrawing nature.This compound finds applications in the synthesis of dyes, pharmaceuticals, and agrochemicals. For instance, it serves as a key intermediate in the production of fluoro-containing pigments that exhibit enhanced stability and color intensity. In the pharmaceutical sector, it can be utilized to prepare drugs targeting specific biological pathways where fluorine substitution can modify the binding affinity or metabolic stability of the final molecule.However, like many aromatic amines, it should be handled with caution due to its potential toxicity and mutagenicity. Adequate personal protective equipment and strict adherence to industrial hygiene practices are necessary to minimize exposure risks. Overall, it represents a versatile building block in organic synthesis, contributing to the development of specialized chemical products across multiple industries.
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Chemical Formula |
C7H8FN |
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Exact Mass |
125.06 |
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Molecular Weight |
125.15 |
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m/z |
125.06 (100.0%), 126.07 (7.6%) |
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Elemental Analysis |
C, 67.18; H, 6.44; F, 15.18; N, 11.19 |
3-Fluoro-4-methylaniline, or 3-fluoro-4-methylbenzenamine, exists primarily as a liquid under standard ambient conditions, though its physical state can be influenced by factors such as temperature, pressure, and purity. The chemical's state as a liquid versus a powder is significant due to the implications it has on handling, storage, and use in various applications.
In its liquid form, it is characterized by its ability to flow freely, which facilitates easy metering, mixing, and transfer processes. This liquidity is advantageous for reactions requiring precise control over stoichiometry and for continuous-flow systems in chemical synthesis. The liquid state also typically allows for better heat transfer, which can be critical in reactions involving temperature-sensitive steps.
On the other hand, if it were to exist as a powder, it would exhibit different handling characteristics. Powders are generally more compact and can be more easily transported and stored in larger quantities per unit volume. However, powders can also be more prone to dust explosion hazards and may require specialized equipment for handling to prevent inhalation or skin contact, which can pose health risks. Additionally, powders may not mix as evenly or as readily with other reactants as liquids, potentially leading to variability in reaction outcomes.
The primary difference between the liquid and powder forms lies in their physical handling properties and the associated safety considerations. While the liquid form offers ease of use in chemical reactions and processing, the powder form, if achievable through specific processing techniques, might offer advantages in storage and transportation efficiency. Ultimately, the choice between the two forms will depend on the specific requirements of the intended application and the safety protocols in place to handle the material safely.
Pharmaceutical Field
In the pharmaceutical industry, 3-Fluoro-4-methylaniline is an important pharmaceutical intermediate. With its unique molecular structure, it serves as a key raw material for the synthesis of various drugs, especially playing a vital role in the research, development and production of antitumor and anti-infective agents. Its core value lies in introducing fluorine and methyl groups into drug molecules, optimizing their pharmacological activity, liposolubility and metabolic stability.
Among its applications, the most representative one is the synthesis of antitumor drugs such as exatecan. Exatecan is a commonly used topoisomerase I inhibitor in clinical practice, mainly indicated for malignant tumors including colorectal cancer and gastric cancer. Its mechanism of action is to induce tumor cell apoptosis by inhibiting the activity of DNA topoisomerase I in tumor cells, thereby blocking DNA replication and transcription. As a key intermediate in exatecan synthesis, the product constructs the core skeleton of the drug molecule through processes such as the Buchwald–Hartwig aryl amination reaction.
Its purity and reactivity directly affect the efficacy and safety of the final drug. In industrial production, its purity is generally required to be no less than 98% (detected by GC) to ensure pharmaceutical quality.In addition to antitumor drugs, the product is also widely used in the synthesis of other types of pharmaceuticals. The high electronegativity and small atomic radius of fluorine can significantly alter the electron distribution of drug molecules, enhance their binding affinity to targets, improve liposolubility to facilitate penetration across cell membranes and the blood-brain barrier.
For this reason, the compound is often employed to optimize the pharmacokinetic properties of drugs. For instance, in the synthesis of certain anti-infective and anti-inflammatory drugs, the product acts as an intermediate to introduce specific functional groups, improving antibacterial and anti-inflammatory effects while reducing toxic and side effects. Furthermore, it can be used in the synthesis of some central nervous system drugs, increasing drug concentration in brain tissue and enhancing therapeutic efficacy by modulating the lipophilicity of drug molecules.
Agrochemical Field
3-Fluoro-4-methylaniline also enjoys extensive applications in the agrochemical sector. As an important pesticide intermediate, it is mainly used in the synthesis of high-efficiency, low-toxicity and environmentally friendly pesticides such as insecticides and acaricides. Its application core is to utilize the unique properties of fluorine to boost insecticidal and acaricidal activity, prolong the duration of efficacy, and reduce harm to non-target organisms and the environment.
In acaricide synthesis, the product is a key raw material for preparing highly active acaricidal compounds. Agricultural pest mites represent one of the most difficult biological groups to control globally, posing severe threats to fruits, vegetables and food crops. It can be used as a starting material to synthesize compounds with excellent acaricidal activity - such as trifluoroethyl sulfide (sulfoxide) acaricides including TC-1 and TC-2 - through multi-step reactions including cyclization, sulfonation, reduction and alkylation.
These acaricides show favorable control effects on spider mite populations resistant to conventional acaricides, are harmless to non-target arthropods, and exhibit good environmental compatibility. For example, using the product and phthalic anhydride as starting materials, 2-(2-fluoro-5-mercapto-4-methylphenyl)isoindolin-1-one can be prepared via multi-step reactions. This compound is a critical intermediate for highly active acaricides, with a synthesis yield of over 89%, providing strong support for the large-scale production of acaricides.
In addition, the product can be applied to synthesize other pesticide types, such as herbicides and fungicides. In herbicide synthesis, it serves as an intermediate to introduce fluorine and methyl groups, enhancing selectivity and herbicidal efficacy against weeds while lowering phytotoxicity to crops. In fungicide synthesis, its distinctive molecular structure helps optimize the antimicrobial spectrum, improve inhibition against pathogenic fungi and bacteria, reduce pesticide dosage, and promote the development of green agriculture. Compared with traditional pesticide intermediates, pesticides synthesized from it feature high efficacy, long persistence and environmental friendliness, aligning with the development trend of modern pesticides.
As an important fluorine-containing aromatic amine intermediate, the product features mature synthetic processes and wide applications. At present, two core approaches are mainly adopted in industrial production and laboratory synthesis, both using readily available starting materials to obtain high-purity products through precise reaction control. The specific synthetic routes and key points are described separately below.
Main Synthetic Method I: Reduction of 2-Fluoro-4-nitrotoluene
This method is the first choice for large-scale industrial production due to its readily available raw materials and low cost, consisting of two core steps.
In the first step, 2-fluoro-4-nitrotoluene is used as the starting material, which can be conveniently prepared via nitration of toluene followed by fluorination, with a required purity of more than 97%.
The second step involves a reduction reaction, commonly using visible-light-induced copper-catalyzed reduction. With a mixed solvent of water and ethanol, copper salt catalyst and reducing agent are added, and the reaction proceeds at room temperature and atmospheric pressure for 6–8 hours to reduce the nitro group (-NO₂) to an amino group (-NH₂), with a reaction yield of 88%–92%.
After the reaction, liquid separation, extraction and distillation purification are performed to obtain the product with a purity of ≥98%. This method is green and environmentally friendly with no large amounts of harmful by-products, making it suitable for industrial mass production.
Auxiliary Synthetic Method II: Amination of Aryl Chloride
This method is suitable for small-scale laboratory preparation, mainly employing the Buchwald–Hartwig aryl amination reaction.Using 3-fluoro-4-methylchlorobenzene as the starting material, it reacts with ammonia under the action of a palladium catalyst, ligand and base at 100–120 °C under high pressure for 4–5 hours, achieving the substitution of chlorine atoms with amino groups.Reaction temperature and pressure must be strictly controlled to avoid side reactions.
After purification by column chromatography, the product purity can reach above 99% with a yield of approximately 85%–89%.This method has a simple reaction route but involves relatively high catalyst costs, making it suitable for scientific research and small-batch custom production.
Both methods require strict attention to raw material purity and reaction condition control to prevent impurities from affecting product quality.
Purification can be carried out via distillation, column chromatography or other methods according to demand, ensuring the final product meets application requirements in pharmaceuticals, agrochemicals and other fields.
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