benzofenon

Benzofenon, known in English as benzophenone, is an organic compound classified as a symmetrical diaryl ketone. Its formula is C13H10O and its IUPAC name is diphenyl methanone. The molecule consists of two phenyl rings joined by a carbonyl group. It is a colorless to pale yellow crystalline solid with a melting point of about 48–50°C and a boiling point of about 305°C. It is relatively insoluble in water but soluble in many organic solvents such as ethanol, acetone, and dichloromethane.

Manufacture and supply: Benzophenone is produced on an industrial scale. Common routes include the oxidation of benzhydrol (diphenylmethanol) to benzophenone and the Friedel–Crafts acylation of benzene with benzoyl chloride under Lewis acid catalysis.

Applications: It is widely used as a photoinitiator to initiate polymerization in UV-curable inks, coatings, and adhesives. It also functions as a UV absorber and stabilizer in polymers and certain cosmetic formulations, and serves as an intermediate in organic synthesis for fragrances and pharmaceutical compounds.

Safety: Benzophenone is generally of low acute toxicity but may cause skin or eye irritation. It can be a skin sensitizer in some individuals. Regulatory evaluations in cosmetics have led to restrictions on benzophenone and related compounds in certain jurisdictions due to concerns about endocrine activity; users should consult local regulations and safety data sheets. Adequate ventilation, gloves, and eye protection are recommended when handling.

Related compounds and derivatives: Benzophenone derivatives are widely used as UV absorbers and photoinitiators in various industrial applications.