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Effects of different reaction conditions on the synthesis of 2, 4 -dihydroxybenzophenone (UV-214)

Yongmei Zhang

Resorcinol reacted with resorcinol in water to produce 2, 4 - dihydroxybenzophenone (UV-214). The quality of 2, 4 - dihydroxybenzophenone (UV- 214) was significantly improved by adding the phase transfer agent, such as methanol, N, N- dimethyl formamide, dimethylformamide, acetic acid, positive ion surfactants, negative ion surfactants, polyethylene glycols and emulsifiers. Effects of different reaction conditions on the synthesis of 2, 4 - dihydroxybenzophenone were discussed. The experimental results showed that the purity and yield of 2, 4 - dihydroxybenzophenone by adding 0.4 g octadecyltrimethylammoniumbromide into the reactionmixture reached 99.4 % and 95.7 %, respectively. It was pale yellow and was used as UV absorber without refinery. It was found that octadecyltrimethylammonium bromide was an ideal phase transfer agent.