Description

2,2-Dimethoxy-2-phenylacetophenone (CAS No. 24650-42-8) is a high-purity photoinitiator widely used in UV-curable coatings, inks, and adhesives. With the molecular formula C₁₆H₁₆O₃ and IUPAC name 2,2-dimethoxy-1,2-diphenylethanone, this compound is renowned for its efficiency in generating free radicals upon exposure to UV light, facilitating rapid polymerization. It is particularly valued for its low yellowing properties and excellent solubility in organic monomers and oligomers. Ideal for applications requiring fast cure times and high crosslink density, this product is a staple in industrial and research settings. Available in crystalline form with ≥98% purity, it is rigorously tested for consistency and performance.

Properties

• CAS Number: 24650-42-8
• Complexity: 284
• IUPAC Name: 2,2-dimethoxy-1,2-diphenyl-ethanone
• InChI: InChI=1S/C16H16O3/c1-18-16(19-2,14-11-7-4-8-12-14)15(17)13-9-5-3-6-10-13/h3-12H,1-2H3
• InChI Key: KWVGIHKZDCUPEU-UHFFFAOYSA-N
• Exact Mass: 256.109944368
• Molecular Formula: C16H16O3
• Molecular Weight: 256.30
• SMILES: COC(C1=CC=CC=C1)(C(=O)C2=CC=CC=C2)OC
• Topological: 35.5
• Monoisotopic Mass: 256.109944368
• Physical Description: NKRA; Pellets or Large Crystals; Liquid
• Synonyms: 2,2-Dimethoxy-2-phenylacetophenone, 2,2-Dimethoxy-1,2-diphenylethanone, Benzil dimethyl ketal, Kayacure BDMK, Ethanone, 2,2-dimethoxy-1,2-diphenyl-, Esacure KB 1, Irgacure 651, Benzil dimethyl acetal, Lucirin BDK, 2,2-Dimethoxy-1,2-diphenylethan-1-one, Photomer 51, Irgacure 621, Irgacure 641, Phenyldimethoxyacetophenone, Irgacure E 651, Irgacure I 651, 1,2-Diphenyl-2,2-dimethoxyethanone, Benzil mono(dimethyl ketal), Benzil mono(dimethyl acetal), 2,2-Dimethoxyphenylacetophenone, Irgacure 951, alpha,alpha-Dimethoxy-alpha-phenylacetophenone, IRG 651, 2-Phenyl-2,2-dimethoxyacetophenone, IR 651, alpha,alpha-Dimethoxydeoxybenzoin, DTXSID7037715, EINECS 246-386-6, omega,omega,Dimethoxy-omega-phenylacetophenone, 1,2-Diphenylethane-1,2-dione, dimethyl ketal, 1DK0094V28, DTXCID5017715, EC 246-386-6, 2,2-dimethoxy-1,2-diphenyl-1-ethanone, Benzil dimethyl acetal (6CI), Omnirad BDK, 2,2Dimethoxyphenylacetophenone, alpha,alphaDimethoxydeoxybenzoin, 2Phenyl2,2dimethoxyacetophenone, 1,2Diphenyl2,2dimethoxyethanone, 2,2Dimethoxy1,2diphenylethanone, Benzil alpha,alphadimethyl acetal, 2,2Dimethoxy1,2diphenylethan1one, Ethanone, 2,2dimethoxy1,2diphenyl, PHENYLDIMETHOXYACETOPHENONE [INCI], alpha,alphaDimethoxyalphaphenylacetophenone, 1,2Diphenylethane1,2dione, dimethyl ketal, omega,omega,Dimethoxyomegaphenylacetophenone, 24650-42-8, Benzil Dimethylketal, KB 1, Benzil alpha,alpha-dimethyl acetal, MFCD00008475, Photocure 51, .alpha.,.alpha.-Dimethoxy-.alpha.-phenylacetophenone, UNII-1DK0094V28, Photoinitiator-651, dimethoxyphenylacetophenone, ChemDiv3_000525, Oprea1_031777, SCHEMBL15173, 2,2-Dimethoxy-2-phenylacetone, Benzoin dimethyl ether (DMPA), CHEMBL364734, SCHEMBL27997116, BDBM22764, HMS1474H19, Tox21_302150, 2,2-dimethoxy-2-phenyl-acetophenone, 2,2-dimethoxy-2-phenylaceto-phenone, SBB067285, .alpha.,.alpha.-Dimethoxydeoxybenzoin, 2,2-dimethyloxy-2-phenyl acetophenone, AKOS001600311, FD22177, NCGC00164347-01, NCGC00164347-02, NCGC00255445-01, 2,2-dimethoxy-1,2-diphenylethane-1-one, AC-10381, BS-22378, 2,2-Dimethoxy-2-phenylacetophenone, 99%, CAS-24650-42-8, CS-0150663, D1702, NS00009411, ST50308308, EN300-19690, E76467, 1,1-DIMETHOXY-1,2-DIPHENYL-2-OXOETHANE, SR-01000400510, Q4596747, SR-01000400510-1, BRD-K94681545-001-01-9, 2,2-Dimethoxy-1,2-diphenylethanone;Benzil dimethyl acetal;1,2-Diphenyl-2,2-dimethoxyethanone, ethanone, 2,2-dimethoxy-1,2-diphenyl-;2,2-dimethoxy-1,2-diphenylethan-1-one;2,2-dimethoxy-1,2-diphenylethanone;benzil dimethyl acetal;ethanone, 2,2-dimethoxy-1,2-diphenyl- 2,2-dimethoxy-1,2-diphenylethan-1-one 2,2-dimethoxy-1,2-diphenylethanone benzil dimethyl acetal

Application

2,2-Dimethoxy-2-phenylacetophenone is primarily used as a photoinitiator in UV-curable systems such as coatings, inks, and adhesives. It enables rapid polymerization under UV light, making it suitable for high-speed industrial processes. Its low volatility and excellent compatibility with resins enhance formulation stability. Researchers also utilize it in photopolymerization studies due to its reliable radical generation. Additionally, it is employed in dental composites and 3D printing resins for precise curing.

Safety and Hazards

GHS Hazard Statements

• H302 (65.1%): Harmful if swallowed [Warning Acute toxicity, oral]
• H373 (65.1%): May causes damage to organs through prolonged or repeated exposure [Warning Specific target organ toxicity, repeated exposure]
• H400 (34.5%): Very toxic to aquatic life [Warning Hazardous to the aquatic environment, acute hazard]
• H410 (35.3%): Very toxic to aquatic life with long lasting effects [Warning Hazardous to the aquatic environment, long-term hazard]
• H412 (63.9%): Harmful to aquatic life with long lasting effects [Hazardous to the aquatic environment, long-term hazard]

Precautionary Statements

• P260, P264, P270, P273, P301+P317, P319, P330, P391, and P501

Hazard Classes and Categories

• Acute Tox. 4 (65.1%)
• STOT RE 2 (65.1%)
• Aquatic Acute 1 (34.5%)
• Aquatic Chronic 1 (35.3%)
• Aquatic Chronic 3 (63.9%)

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