1-Bromo-4-iodo-2-methylbenzene, identified by its CAS No. 202865-85-8, is a significant chemical compound with the molecular formula C7H6BrI and a molecular weight of 296.93 g/mol. Also known as 2-Bromo-5-iodotoluene, this compound serves as a crucial building block and organic intermediate in various sophisticated chemical processes. Its unique structural configuration, featuring both bromine and iodine atoms on a methyl-substituted benzene ring, renders it exceptionally valuable for complex synthetic pathways in pharmaceutical, agrochemical, and specialized materials industries.

The physical and chemical properties of 1-Bromo-4-iodo-2-methylbenzene make it a highly sought-after material. It typically appears as a colorless liquid, though variations to light orange or yellow have been observed, depending on the specific conditions. With a boiling point of approximately 264.2 ± 20.0 °C at 760 mmHg and a density of around 2.1 ± 0.1 g/cm3, it exhibits characteristic stability suitable for controlled reactions. The flash point is noted at 114 °C, requiring careful handling. A high level of purity, generally 98% or 99% minimum, is essential for its effective use in demanding applications, ensuring consistent performance and yield in downstream processes.

The applications of 1-Bromo-4-iodo-2-methylbenzene are diverse and critical. Primarily, it functions as a versatile organic intermediate in the synthesis of a wide array of fine chemicals and advanced materials. Its halogen substituents, bromine and iodine, are particularly reactive, allowing for selective functionalization and the introduction of complex molecular architectures. This makes it indispensable in the creation of novel compounds, including other brominated and iodinated derivatives, which are often precursors for active pharmaceutical ingredients (APIs), specialty polymers, and electronic chemicals. Furthermore, its documented use as an immunosorbent in immunoassays and as a fluorescing radical for detecting other radicals highlights its potential in analytical and diagnostic fields, expanding its utility beyond conventional organic synthesis.

The synthesis of 1-Bromo-4-iodo-2-methylbenzene typically involves precise organic reactions, such as the reaction of sodium periodate with 2-bromotoluene, often catalyzed by radical mechanisms. Such synthetic routes underscore its role in advancing organic chemistry by providing efficient methods for obtaining complex brominated compounds. Given its reactive nature, adherence to stringent safety protocols is paramount during handling and storage. It is classified as an irritant and requires appropriate protective measures to ensure safe laboratory and industrial operations.

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