4-Bromo-3-fluoro-1-methyl-1H-pyrazole(CAS: 1785074-93-2)

4-Bromo-3-fluoro-1-methyl-1H-pyrazole is a crystalline solid with a molecular weight of approximately 246.02 g/mol. It has a melting point of 230-232°C and is only slightly soluble in water but highly soluble in organic solvents like acetone and dichloromethane. This compound is known for its moderate reactivity, particularly in halogenation and nucleophilic substitution reactions.

4-Bromo-3-fluoro-1-methyl-1H-pyrazole is commonly synthesized through the bromination of 3-fluoro-1-methyl-1H-pyrazole using N-bromosuccinimide (NBS) as the brominating agent. The reaction is typically carried out under radical conditions, and the yield can be improved by using a suitable catalyst and optimizing reaction conditions such as temperature and stirring speed.

4-Bromo-3-fluoro-1-methyl-1H-pyrazole is used in various industries, including pharmaceuticals, where it serves as a precursor for the synthesis of more complex compounds. It is also utilized in the polymer industry for the modification of polymers, in sensor technology for detecting specific chemicals, and in semiconductor manufacturing for etching and photoresist applications.

When handling 4-Bromo-3-fluoro-1-methyl-1H-pyrazole, it is essential to wear appropriate personal protective equipment (PPE), including gloves, goggles, and a lab coat. The substance should be handled in a well-ventilated area or a fume hood to minimize inhalation risk. In case of spills, use appropriate spill cleanup kits and follow safety data sheet (SDS) guidelines for disposal. Always ensure proper storage in a cool, dry place away from incompatible materials.