Ullmann反応を利用した非対称型ジアリール化合物の合成
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概要
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Optimum conditions for the formation of unsymmetrical biaryl compounds, especially p-terphenyl, in the Ullmann reaction are investigated. Studies of reactions between the halogenated benzenes and the 4-halogenated biphenyls are carried out for the preparation of p-terphenyl and it has been found that an appropriate selection of a kind of halogen atom consisted in the halogenated benzenes and the halogenated biphenyls are quite effective for increasing the yield of p-terphenyl. If the halogen atom either in the halogenated benzenes or in the halogenated biphenyls is chlorine, there is hardly produced any p-terphenyl. The couple of bromobenzene and 4-iodobiphenyl yields plenty of p-terphenyl. As to the catalyst, metallic copper containing a small amount of cupric oxide makes the reaction most effective.
- 社団法人 有機合成化学協会の論文