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4-Bromo-3-chloro-2-methylphenylboronic acid (CAS No. 2121514-78-9): An Overview of Its Properties, Applications, and Recent Research

4-Bromo-3-chloro-2-methylphenylboronic acid (CAS No. 2121514-78-9) is a versatile organic compound that has gained significant attention in the fields of medicinal chemistry and materials science. This compound is characterized by its unique combination of bromine, chlorine, and boronic acid functionalities, which make it an attractive building block for various synthetic transformations and applications.

The chemical structure of 4-Bromo-3-chloro-2-methylphenylboronic acid consists of a substituted phenyl ring with a bromine atom at the 4-position, a chlorine atom at the 3-position, and a methyl group at the 2-position. The boronic acid moiety is attached to the phenyl ring, providing additional reactivity and functionalization potential. This combination of substituents imparts unique physical and chemical properties to the compound, making it a valuable intermediate in organic synthesis.

In terms of physical properties, 4-Bromo-3-chloro-2-methylphenylboronic acid is a white to off-white solid with a melting point typically ranging from 100 to 105°C. It is soluble in polar solvents such as water, ethanol, and dimethyl sulfoxide (DMSO), but exhibits limited solubility in non-polar solvents like hexane. These solubility characteristics are crucial for its use in various synthetic protocols and analytical methods.

The reactivity of 4-Bromo-3-chloro-2-methylphenylboronic acid is primarily driven by its boronic acid functionality. Boronic acids are known for their ability to undergo Suzuki-Miyaura coupling reactions, which are widely used in the synthesis of biologically active molecules and advanced materials. In these reactions, boronic acids react with aryl or vinyl halides in the presence of a palladium catalyst to form new carbon-carbon bonds. The presence of the bromine and chlorine substituents on the phenyl ring further enhances the versatility of this compound by providing additional handles for further functionalization.

Recent research has highlighted several applications of 4-Bromo-3-chloro-2-methylphenylboronic acid. In medicinal chemistry, this compound has been used as a key intermediate in the synthesis of potential drug candidates. For example, a study published in the Journal of Medicinal Chemistry reported the use of 4-Bromo-3-chloro-2-methylphenylboronic acid in the development of novel inhibitors targeting specific enzymes involved in cancer progression. The bromine and chlorine substituents were found to play crucial roles in modulating the potency and selectivity of these inhibitors.

In materials science, 4-Bromo-3-chloro-2-methylphenylboronic acid has been explored for its potential use in the synthesis of functional polymers and organic semiconductors. A recent publication in Advanced Materials described the preparation of conjugated polymers using this compound as a building block. The resulting polymers exhibited excellent electronic properties and were used in the fabrication of organic field-effect transistors (OFETs) with high mobility.

The synthetic accessibility of 4-Bromo-3-chloro-2-methylphenylboronic acid has also been improved through various methodologies. One notable approach involves the sequential introduction of bromine and chlorine substituents onto a phenylboronic acid scaffold using selective halogenation reactions. This method allows for precise control over the substitution pattern and can be readily scaled up for industrial production.

Safety considerations are an important aspect when handling 4-Bromo-3-chloro-2-methylphenylboronic acid. While this compound is not classified as hazardous under standard regulations, it is recommended to follow standard laboratory safety protocols when working with it. Proper personal protective equipment (PPE) such as gloves, goggles, and lab coats should be worn to minimize exposure risks. Additionally, appropriate ventilation should be ensured to prevent inhalation of any volatile by-products during synthesis or handling.

In conclusion, 4-Bromo-3-chloro-2-methylphenylboronic acid (CAS No. 2121514-78-9) is a highly versatile compound with a wide range of applications in medicinal chemistry and materials science. Its unique combination of bromine, chlorine, and boronic acid functionalities makes it an attractive building block for various synthetic transformations. Recent research has demonstrated its potential in developing novel drug candidates and advanced materials, further highlighting its significance in these fields.

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