Understanding the fundamental chemical properties and synthesis methods of key intermediates is vital for their effective utilization in industrial and research settings. 4-Bromobiphenyl, identified by its CAS number 92-66-0, is a compound of significant interest due to its versatile applications, particularly as an OLED intermediate and a pharmaceutical raw intermediate. This article explores its core chemical attributes and how it is typically synthesized.

Chemically, 4-Bromobiphenyl (C12H9Br) is a halogenated aromatic hydrocarbon. It features a biphenyl structure, consisting of two phenyl rings directly linked, with a bromine atom attached to the para position (position 4) of one of the rings. This structural arrangement imparts specific reactivity, making it a valuable substrate for various chemical transformations.

Key physical properties of 4-Bromobiphenyl include its appearance as white to slightly yellow crystalline flakes. It has a melting point in the range of 82-86°C and a boiling point of approximately 309.8°C at 760 mmHg. Its solubility is limited in water but good in organic solvents like dioxane. These properties are critical for handling, storage, and integration into different chemical processes.

The synthesis of 4-Bromobiphenyl can be achieved through several methods, often involving electrophilic aromatic substitution reactions. A common route is the bromination of biphenyl, where biphenyl is reacted with a brominating agent, such as bromine in the presence of a Lewis acid catalyst (e.g., ferric bromide), to selectively introduce the bromine atom at the para position. Alternatively, cross-coupling reactions involving appropriately substituted benzene rings can also be employed to construct the biphenyl framework with the bromine substituent already in place.

Manufacturers like Ningbo Inno Pharmchem Co., Ltd. focus on optimizing these synthesis pathways to achieve high yields and purity, ensuring that the 4-Bromobiphenyl produced is suitable for demanding applications in OLED material synthesis, pharmaceutical intermediates, and fine chemical production. The availability of reliable synthesis routes and consistent product quality is what makes this compound a cornerstone for innovation.