Benzil[2]
Overview
Benzil (C14H10O2) is a diketone derivative of biphenyl, characterized by its bright yellow crystals and role as a versatile intermediate in chemical synthesis. It is synthesized via the oxidation of benzoin or through Friedel-Crafts acylation. Its symmetrical structure and reactivity make it valuable in pharmaceuticals, agrochemicals, and polymer industries. Historically, benzil gained prominence as a photoinitiator in UV-curable inks and coatings due to its ability to generate free radicals under light exposure. Its stability and ease of handling further contribute to its industrial adoption.
Physical and Chemical Properties
Benzil exhibits a melting point of 94-96°C and a boiling point of 346-348°C, with moderate solubility in polar organic solvents like ethanol and acetone. Its crystalline form is stable under ambient conditions but may degrade upon prolonged UV exposure. Chemically, benzil undergoes reactions typical of α-diketones, including reductions to hydrobenzoin and condensations to form heterocycles. Its photoactivity is leveraged in polymer crosslinking, where it initiates radical polymerization upon UV irradiation.
Main Applications
In polymer chemistry, benzil serves as a photoinitiator for UV-curable resins, enabling fast curing in adhesives and coatings. It is also a precursor for benzimidazoles, used in pharmaceuticals and corrosion inhibitors. Industrial applications include its use as a crosslinker for silicone rubbers and a reagent in organic synthesis, such as the synthesis of tetraphenylethylene derivatives. Its role in agrochemical intermediates further underscores its versatility.
Safety and Storage
Benzil is classified as an irritant, requiring handling with gloves and eye protection. Avoid inhalation of dust and contact with skin. Storage should be in airtight containers, away from light and oxidizing agents, to prevent degradation. Spills should be contained with inert absorbents and disposed of as hazardous waste. Regulatory guidelines (e.g., OSHA, REACH) mandate proper labeling and SDS documentation for workplace safety.
B2B Procurement Guide
Buyers should specify purity (typically 98-99%) and packaging (25kg drums or custom quantities). Supplier audits are recommended to ensure compliance with ISO standards for chemical manufacturing. Pricing varies with market demand and purity; bulk purchases (100+ kg) may offer discounts. Verified suppliers include major chemical distributors like Sigma-Aldrich and TCI Chemicals.
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