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Synthesis of 2-hydroxy-4-n-octaoxybenzophenones (UV-531) with the phase transfer method

Hongjie Lu

2, 4 - dihydroxybenzophenone (UV-214) reacted with 1 - bromododecane in KOH solution to produce 2-hydroxy-4-n-octaoxybenzophenones (UV- 531). The quality of 2-hydroxy-4-n-octaoxybenzophenones (UV-531) was significantly improved by adding the phase transfer agent, such as N, Ndimethyl formamide, diethyl ether, methyl sulfate octadecyl trimethyl ammonium, alkyltrimethylammoniumchloride, dimethyl cetyl ammonium chloride, ammonium dodecyl benzene sulfonate, octadecyl methyl sulfonate sodium, polyethylene glycols and emulsifiers. The experimental results showed that the purity and yield of 2-hydroxy-4-noctaoxybenzophenones by adding 0.8%dimethyl cetyl ammoniumchloride into the reaction mixture reached 88.5 % and 93.2 %, respectively. It was pale yellow and was used as UV absorber without refinery. It was found that dimethyl cetyl ammonium chloride was an ideal phase transfer agent.