Overview
Methylbenzophenone (CAS 134-84-9) is a derivative of benzophenone, characterized by a methyl group substitution on the phenyl ring. It is primarily utilized in industrial applications due to its UV-absorbing properties and stability under light exposure. The compound is synthesized through Friedel-Crafts acylation, ensuring high purity for specialized uses. Its role in pharmaceuticals includes serving as an intermediate for antihistamines and other active ingredients. In fragrances, it acts as a fixative to prolong scent longevity. The UV-curing industry employs it as a photoinitiator, enabling rapid polymerization in inks and coatings.
Physical and Chemical Properties
Methylbenzophenone exhibits a melting point range of 57-61°C and a boiling point near 310°C, making it stable under moderate thermal conditions. Its density of 1.06 g/cm³ and solubility in organic solvents like ethanol facilitate easy formulation in liquid systems. The crystalline powder form ensures consistent handling and dosing in industrial processes. Key chemical properties include resistance to hydrolysis and oxidation, which are critical for storage and long-term use. The aromatic ketone structure contributes to its effectiveness in UV absorption, particularly in the 250-350 nm wavelength range, suitable for protective coatings and sunscreens.
Main Applications
In pharmaceuticals, methylbenzophenone is a precursor for synthesizing drugs such as diphenhydramine. Its photostability makes it valuable in sunscreen formulations and optical materials. The fragrance industry uses it to stabilize volatile aroma compounds, enhancing product shelf life. UV-curing systems rely on methylbenzophenone as a photoinitiator, where it generates free radicals upon UV exposure to initiate polymerization. This application is prevalent in adhesives, printing inks, and dental composites, offering energy-efficient curing with minimal heat generation.
Safety and Storage
Methylbenzophenone requires careful handling to avoid respiratory or dermal irritation. Safety measures include using gloves, goggles, and ventilation in workspaces. Storage should be in tightly sealed containers, away from direct sunlight and moisture to prevent degradation. Regulatory compliance includes adherence to REACH and OSHA guidelines. Spills should be contained with inert absorbents, and disposal must follow local hazardous waste protocols. SDS documentation provides detailed hazard communication for industrial users.
B2B Procurement Guide
Industrial buyers should prioritize suppliers with ISO certification and batch-specific COA (Certificate of Analysis) to guarantee purity (≥98%). Bulk procurement (100kg+) often reduces costs by 10-20%. Key evaluation criteria include solvent residue levels and particle size uniformity for specific applications. Logistics considerations include temperature-controlled transport for large orders to prevent melting or clumping. Preferred suppliers are typically located in China, India, or Europe, offering competitive pricing and flexible MOQs (Minimum Order Quantities).
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