4-Bromo-2-fluoro-N-methylbenzamide (CAS 749927-69-3): A Comprehensive Introduction
4-Bromo-2-fluoro-N-methylbenzamide, with the CAS number 749927-69-3, is a significant chemical compound in the field of organic chemistry. This compound has attracted considerable attention due to its unique chemical structure and a wide range of potential applications. In this article, we will delve into the details of 4-Bromo-2-fluoro-N-methylbenzamide, including its properties, uses, applications in various fields, and preparation methods.
Properties of 4-Bromo-2-fluoro-N-methylbenzamide
4-Bromo-2-fluoro-N-methylbenzamide has a distinct molecular formula C₈H₇BrFNO. It consists of a benzene ring substituted with a bromine atom at the 4 – position, a fluorine atom at the 2 – position, and an N – methyl amide group at the carbonyl carbon. The presence of these functional groups imparts specific physical and chemical properties to the compound.
Physical Properties
- Appearance: It is typically a solid at room temperature. The exact appearance may vary depending on the purity and the conditions under which it is synthesized, but it often presents as a white to off – white crystalline solid.
- Melting Point: The melting point of 4-Bromo-2-fluoro-N-methylbenzamide is an important physical characteristic. Precise determination of the melting point can help in assessing the purity of the compound. Generally, it has a melting point within a certain range that can be experimentally determined using techniques such as differential scanning calorimetry (DSC).
- Solubility: In terms of solubility, 4-Bromo-2-fluoro-N-methylbenzamide shows different solubilities in various solvents. It has limited solubility in water, but it is more soluble in organic solvents such as ethanol, methanol, dichloromethane, and chloroform. This solubility behavior is crucial for its use in chemical reactions and purification processes.
Chemical Properties
- Reactivity: The bromine and fluorine atoms on the benzene ring, as well as the amide group, make 4-Bromo-2-fluoro-N-methylbenzamide reactive towards certain chemical reagents. For example, the bromine atom can undergo substitution reactions under appropriate conditions, such as nucleophilic substitution reactions with suitable nucleophiles. The amide group can participate in hydrolysis reactions under acidic or basic conditions, leading to the formation of carboxylic acid and amine derivatives.
- Stability: Under normal storage conditions, 4-Bromo-2-fluoro-N-methylbenzamide is relatively stable. However, it should be protected from extreme temperatures, moisture, and strong oxidizing or reducing agents to prevent decomposition or unwanted chemical reactions.
Uses of 4-Bromo-2-fluoro-N-methylbenzamide
4-Bromo-2-fluoro-N-methylbenzamide has a variety of uses in different areas, mainly due to its unique chemical structure and reactivity. Here are some of its common uses:
Intermediate in Organic Synthesis
One of the primary uses of 4-Bromo-2-fluoro-N-methylbenzamide is as an intermediate in organic synthesis. It can be used as a building block to synthesize more complex organic compounds. For example, the bromine atom on the benzene ring can be used to introduce other functional groups through cross – coupling reactions, such as Suzuki coupling, Heck coupling, or Sonogashira coupling. These reactions allow the formation of carbon – carbon bonds, enabling the synthesis of various substituted benzene derivatives. The amide group can also be further modified to introduce other functional groups, such as converting it to an amine or a carboxylic acid, which can then be used in the synthesis of pharmaceuticals, agrochemicals, and materials.
Research and Development
In the field of research and development, 4-Bromo-2-fluoro-N-methylbenzamide is often used as a model compound to study the reactivity and properties of halogen – substituted benzamides. Scientists can use it to investigate the effects of different reaction conditions on the chemical reactions of these compounds, such as the influence of temperature, solvent, and catalyst on substitution reactions. This research can provide valuable insights into the reaction mechanisms and help in the development of new synthetic methods.
Applications in Various Fields
Pharmaceutical Industry
In the pharmaceutical industry, 4-Bromo-2-fluoro-N-methylbenzamide has potential applications in drug discovery and development. The unique combination of bromine, fluorine, and amide groups in its structure can confer specific biological activities. For example, halogen – substituted benzamides have been reported to have antibacterial, antifungal, and anti – inflammatory properties. 4-Bromo-2-fluoro-N-methylbenzamide can be used as a starting material to synthesize novel drug candidates. By modifying its structure through chemical reactions, researchers can design and synthesize compounds with improved pharmacological properties, such as better bioavailability, higher potency, and fewer side effects. Some studies have also shown that derivatives of 4-Bromo-2-fluoro-N-methylbenzamide can interact with specific biological targets, such as enzymes or receptors, which can be exploited for the development of new drugs for the treatment of various diseases.
Agrochemical Industry
In the agrochemical industry, 4-Bromo-2-fluoro-N-methylbenzamide can be used as an intermediate in the synthesis of pesticides and herbicides. The presence of halogen atoms in the compound can enhance its biological activity against pests and weeds. For example, halogen – substituted benzamides can act as inhibitors of certain enzymes in pests or weeds, disrupting their normal physiological processes and leading to their death. By further modifying the structure of 4-Bromo-2-fluoro-N-methylbenzamide, agrochemical companies can develop more effective and environmentally friendly pesticides and herbicides.
Materials Science
In materials science, 4-Bromo-2-fluoro-N-methylbenzamide can be used in the synthesis of functional materials. For example, it can be incorporated into polymers to introduce specific functional groups, which can improve the properties of the polymers, such as their solubility, thermal stability, and mechanical strength. The bromine and fluorine atoms can also participate in the formation of cross – linked structures, which can enhance the performance of the materials in various applications, such as in the development of electronic devices, coatings, and membranes.
Preparation Methods of 4-Bromo-2-fluoro-N-methylbenzamide
There are several methods for the preparation of 4-Bromo-2-fluoro-N-methylbenzamide. Here are some common approaches:
Method 1: From 4 – Bromo – 2 – fluorobenzoic acid
The first step is to convert 4 – bromo – 2 – fluorobenzoic acid to its acid chloride. This can be achieved by reacting 4 – bromo – 2 – fluorobenzoic acid with thionyl chloride (SOCl₂) in the presence of a catalytic amount of dimethylformamide (DMF). The reaction is typically carried out under reflux conditions, and the acid chloride is formed as an intermediate. The reaction equation is as follows:
4 – Bromo – 2 – fluorobenzoic acid + SOCl₂ → 4 – Bromo – 2 – fluorobenzoyl chloride + SO₂ + HCl
Next, the 4 – bromo – 2 – fluorobenzoyl chloride is reacted with methylamine (CH₃NH₂) to form 4-Bromo-2-fluoro-N-methylbenzamide. This reaction is usually carried out in an organic solvent, such as dichloromethane or tetrahydrofuran (THF), at a low temperature. The reaction equation is:
4 – Bromo – 2 – fluorobenzoyl chloride + CH₃NH₂ → 4-Bromo-2-fluoro-N-methylbenzamide + HCl
After the reaction is completed, the product can be purified by methods such as recrystallization or column chromatography.
Method 2: Through a Multistep Synthesis
Another approach involves a multistep synthesis starting from a suitable precursor. For example, one can start with a bromo – fluorobenzene derivative and introduce the amide group through a series of reactions. First, the bromo – fluorobenzene can be nitrated to introduce a nitro group at a specific position. Then, the nitro group can be reduced to an amino group using a reducing agent such as iron powder and hydrochloric acid. After that, the amino group can be acylated with an appropriate acylating agent, such as acetic anhydride or an acid chloride, to form an amide. Finally, the amide can be further modified to introduce the N – methyl group through a methylation reaction, such as using methyl iodide (CH₃I) in the presence of a base. This multistep synthesis requires careful control of reaction conditions and purification steps at each stage to obtain a high – purity product.
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