diphenylketone

Diphenylketone, also known as benzophenone, is an organic compound with the chemical formula (C6H5)2CO. It is a white solid at room temperature, with a characteristic rose-like odor. Benzophenone is a diaryl ketone, meaning it consists of a central carbonyl group bonded to two phenyl rings. Its structure can be visualized as a ketone where the two alkyl groups of a typical ketone are replaced by phenyl groups.

This compound is widely used in various industries. A significant application is as a photoinitiator in ultraviolet (UV) curing processes, where it absorbs UV light and initiates polymerization reactions. This property makes it valuable in inks, coatings, and adhesives. Benzophenone is also employed as a UV blocker in plastics, packaging, and sunscreens to protect contents or skin from the damaging effects of UV radiation. In perfumery, it serves as a fixative, helping to prolong the scent of fragrances. It can also be found as a flavoring agent in some food products, although its use in this area is subject to regulatory approval.

Industrially, benzophenone can be synthesized through several methods, including the Friedel-Crafts acylation of benzene with benzoyl chloride or through the oxidation of diphenylmethane. It is a relatively stable compound, but it can undergo reactions characteristic of ketones and aromatic compounds. Its flammability and potential for skin irritation are factors to consider during handling and use.