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4-Fluorobenzylamine, also known as p-fluorobenzylamine, is an organic compound. Molecular formula C7H8FN, CAS 140-75-0. It is a colorless to light yellow liquid with a pungent odor. It can be miscible with organic solvents such as water, alcohol, ketone, ether, etc., but is insoluble in alkanes and cyclohexane. Under normal storage conditions, it is stable but may react with moisture and oxygen in the air, especially under high temperature and/or light conditions. The compound has a flash point above 23 ℃ and is not classified as a flammable liquid. In addition, it is not flammable and there is no risk of explosion.
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Chemical Formula |
C7H8FN |
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Exact Mass |
125 |
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Molecular Weight |
125 |
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m/z |
125 (100.0%), 126 (7.6%) |
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Elemental Analysis |
C, 67.18; H, 6.44; F, 15.18; N, 11.19 |
It can be used in fields such as synthesizing spices and preparing coating materials. With the continuous development of technology and the application of new technologies, it is believed that its use will be further expanded and improved. It should be noted during use that due to the toxicity and irritation of product, relevant safety operating procedures and protective measures should be followed to ensure safe use.
4-Fluorobenzylamine is an important organic compound with specific physical and chemical properties. Its appearance is a transparent colorless liquid with a density of about 1.09, a high boiling point, and a flash point of about 66 ℃. 4-fluorobenzylamne is mainly used as an intermediate in pharmaceuticals and pesticides, and is a key raw material for synthesizing various drugs and pesticides.
Here are some potential uses in the field of environmental protection:
1. Pharmaceutical intermediates: promoting the development of environmentally friendly drugs
It is an important intermediate in various pharmaceuticals, including the anti allergic drug metronidazole and the analgesic Flupirine. The development and production of these drugs are of great significance for improving human health and reducing disease pain. By improving human health, it indirectly reduces environmental pollution and ecological damage caused by diseases.
(1) Azizumab: As an anti allergic drug, Azizumab helps reduce the use of pesticides such as fluorinated insecticides and herbicides due to allergic symptoms. The excessive use of these pesticides can cause harm to the environment and ecosystems, and the widespread use of metronidazole can help reduce this risk.
(2)Flupirine： As an analgesic, the development and production of Flupirine also helps reduce the use of other drugs due to pain, indirectly reducing environmental pollution.
2. Pesticide intermediates: promoting the development of green pesticides
It is still an important intermediate for various pesticides. Pesticides play an important role in agricultural production, but excessive or improper use can cause harm to the environment and ecosystems. By developing efficient and low toxicity pesticide varieties, the pollution of pesticides on the environment can be reduced.
(1) Green pesticide research and development: By using it as an intermediate, green pesticides with high efficiency, low toxicity, and environmental friendliness can be developed. The widespread use of these pesticides in agricultural production helps to reduce the pollution and damage caused by traditional pesticides to the environment.
(2) Pesticide residue control: By optimizing the synthesis process and usage methods of pesticides, the residual amount of pesticides in agricultural products can be reduced. As a pesticide intermediate, it helps to promote the achievement of this goal.
3. Research and development of environmentally friendly materials: promoting innovation in environmentally friendly materials
With the increasing awareness of environmental protection, more and more environmentally friendly materials are being developed and applied. As an organic compound, its specific chemical properties make it possible to become a raw material or additive for certain environmentally friendly materials.
(1) Research and development of environmentally friendly coatings:
Through modification or composite treatment, environmentally friendly coatings with excellent performance can be prepared. These coatings release fewer harmful substances during the coating process and pose less harm to the environment and human health.
(2) Research and development of environmentally friendly adhesives: By utilizing specific properties, adhesives with excellent bonding performance and environmentally friendly characteristics can be developed. The widespread use of these adhesives in industrial production helps to reduce the environmental pollution caused by traditional adhesives.
4. Environmental monitoring and analysis: improving the accuracy of environmental monitoring
In the field of environmental protection, monitoring and analysis tools are essential. Specific chemical properties make it possible to become a raw material or reagent for certain environmental monitoring and analysis tools.
(1) Optimization of environmental monitoring methods: By utilizing chemical reaction characteristics, analytical methods with higher sensitivity and accuracy can be developed for detecting pollutant content in the environment. The application of these methods helps to timely detect and address environmental pollution issues.
(2) Environmental data analysis: By using 4-Fluorobenzylamine as a reagent or raw material, instruments and equipment for environmental data analysis can be developed. The application of these devices and instruments helps to improve the accuracy and reliability of environmental monitoring data.
Specific examples
Although there are relatively few direct applications in the field of environmental protection, the following are some possible specific examples:
1. Environmental applications in pharmaceutical research and development
(1) Production of Azizumab: Azizumab, as an anti allergic drug, is used as an intermediate in its production process. By optimizing the production process of astemizole, energy consumption and waste emissions during the production process can be reduced, thereby reducing environmental pollution.
(2) Development of Flupirine: Flupirine, as an analgesic drug, was also used as an intermediate in its development process. By improving the synthesis process of Flupirine, its yield and purity can be increased, and waste emissions during the production process can be reduced.
2. Environmental applications in pesticide research and development
(1) The synthesis of green pesticides: By using them as intermediates, green pesticides with high efficiency, low toxicity, and environmental friendliness can be synthesized. The widespread use of these pesticides in agricultural production helps to reduce the pollution and damage caused by traditional pesticides to the environment.
(2) Pesticide residue control: By optimizing the synthesis process and usage methods of pesticides, the residual amount of pesticides in agricultural products can be reduced.
For example, using it as an intermediate in pesticide synthesis can optimize the structure and properties of pesticides, thereby reducing their residual levels in agricultural products.
3. Application in the research and development of environmentally friendly materials
(1) Preparation of environmentally friendly coatings: Through modification or composite treatment, it can be used to prepare environmentally friendly coatings with excellent performance. These coatings release fewer harmful substances during the coating process and pose less harm to the environment and human health.
For example, it can be compounded with certain resins or pigments to prepare coatings with excellent weather resistance and environmental characteristics.
(2)Preparation of environmentally friendly adhesives: By utilizing specific properties, adhesives with excellent bonding performance and environmental characteristics can be developed. The widespread use of these adhesives in industrial production helps to reduce the environmental pollution caused by traditional adhesives. For example, it can be blended with certain polymers to prepare adhesives with excellent bonding properties and environmentally friendly characteristics.
4. Application in Environmental Monitoring and Analysis
(1) Optimization of environmental monitoring methods: By utilizing chemical reaction characteristics, analytical methods with higher sensitivity and accuracy for detecting pollutant content in the environment can be developed. For example, analytical methods for detecting the content of certain pollutants can be developed by utilizing their reaction characteristics with certain metal ions or organic compounds.
(2) Application of environmental data analysis: As reagents or raw materials, instruments and equipment for environmental data analysis can be developed. The application of these devices and instruments helps to improve the accuracy and reliability of environmental monitoring data. For example, it can be combined with certain sensors or detectors to develop instruments and equipment for real-time monitoring of pollutant levels in the environment.
The synthesis of 4-fluorobenzylamne using the phenol method is a commonly used method, with the following steps:
1. Preparation of raw materials: phenol, hydrofluoric acid, and ammonia or ammonia gas.
2. Mix phenol and hydrofluoric acid evenly, stir and heat to an appropriate temperature (usually around 60 ℃).
3. Add an appropriate amount of ammonia water or gas and adjust the pH value to around 8-9.
4. After continuing the stirring reaction for a period of time, cool to room temperature to obtain the crude product.
5. Separate and purify the crude product to obtain the target product.
The chemical equation for this method is:
C6H5OH + HF → C6H4FCH3 + H2O
Among them, C6H5OH is phenol, HF is hydrofluoric acid, and C6H4FCH3 is 4 fluorobenzylamine. This reaction is a simple acid-base neutralization reaction, generating the target product and water. It should be noted that during the synthesis process, it is necessary to pay attention to safety operating procedures and protective measures to ensure personal safety and environmental protection.
The synthesis of 4 fluorobenzylamine using 4-nitrobenzylamine method is a commonly used method, with the following steps:
1. Preparation of raw materials: 4-nitrobenzylamine, hydrofluoric acid, and triethylamine or pyridine.
2. Mix 4-nitrobenzylamine and hydrofluoric acid evenly, stir and heat to an appropriate temperature (usually around 60 ℃).
3. Add an appropriate amount of triethylamine or pyridine as a catalyst and adjust the pH value to around 8-9.
4. After continuing the stirring reaction for a period of time, cool to room temperature to obtain the crude product.
5. Separate and purify the crude product to obtain the target product.
The chemical equation for this method is:
C6H7N + HF → C6H4FCH3 + NH3
Among them, C6H7N is 4-nitrobenzylamine, HF is hydrofluoric acid, and C6H4FCH3 is 4 fluorobenzylamine. This reaction is a simple substitution reaction that generates the target product 4-fluorobenzylamine and ammonia. It should be noted that during the synthesis process, it is necessary to pay attention to safety operating procedures and protective measures to ensure personal safety and environmental protection.
Development timeline
Early synthetic literature appeared in 1955-1956. Brown et al. (J Am Chem Soc, 1956) and Ol'ah et al. (Acta Chim Acad Sci Hung, 1955) published synthetic routes using p-nitrobenzoic acid as the starting material, followed by fluorination, acylation, and reduction to obtain p-fluorobenzylamine.
However, the total yield was only about 30%, and there were many by-products (dimers and benzylamine impurities were difficult to remove), resulting in a large amount of waste discharge.
In the early 1990s and 2000s, the industry began to explore alternative routes:
① Reduction of fluorobenzonitrile by LiAlH ₄ (raw material not available for industrial supply);
② Fluorobenzene+paraformaldehyde+HCl → Fluorochlorobenzyl → Urotropine reaction (complicated operation, high irritability);
③ Fluorochlorobenzyl+N-chloromethylphthalimide → hydrazinolysis (high cost, complex process). These routes have not become mainstream.
Around 2005, the industry gradually established the three-step process (fluorination → acylation → reduction) starting from p-nitrobenzoic acid as the mainstream industrialization route. The main domestic manufacturers include Liaoning Tianhe Fine Chemical, Jiangsu Sheyang Fluorochemicals, Fuxin Hengyuan Chemical, Jintan Lianyi Fine Chemical Plant, Shandong Tianhao Chemical, etc.
On June 11, 2021, Anhui Dexinjia Biopharmaceutical Co., Ltd. published patent CN112939785A, proposing an aldehyde oxime hydrogenation method: p-fluorobenzaldehyde → hydroxylamine hydrochloride to oxime (yield 98.24%) → Raney nickel catalytic hydrogenation (55 ° C, 0.4MPa) → p-fluorobenzylamine. The total yield of the two-step method reached 91%, and the liquid-phase purity was 99.5%, significantly exceeding the traditional three-step method.
The industry will enter a period of technological iteration from 2023 to 2025. The mainstream route still relies on the nitrobenzoic acid method (yield~30.43%), but the aldoxime hydrogenation method is gradually being promoted due to its high yield and purity. Significant increase in domestic suppliers: Hubei Shishun Biotechnology, Wuhan Yuqing Jiaheng (established in 2009), Qingdao Dexin Chemical (established in 2021), Shandong Xuchen Chemical, etc.
The 2025 industry report shows that environmental emission standards will be tightened (fluoride limit for wastewater ≤ 10mg/L), the clearance of small and medium-sized production capacity will accelerate, and the industry concentration CR5 is expected to increase to 58%. Downstream demand is concentrated towards high-purity, low impurity pharmaceutical grade products.
In 2026 (current), global demand for fluorobenzylamine continues to grow, with domestic demand increasing at an average annual rate of about 7% under the baseline scenario. It is expected to reach 84500 tons by 2030 (optimistic scenario exceeding 105000 tons). Technical focus: continuous flow reaction, automation control, biocatalysis, solvent closed-loop recovery and other green processes.
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