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苯的邻位二取代衍生物的制备十分困难,通常不能用常法进行合成。邻-二苯酰苯(O- dibenzoylbenzene,I)和邻-二茮苯(O- dibenzoylbenzene,Ⅱ)这些有用化合物的制备,文献上未报导过适宜的方法。作者对它们进行了研究,现在所报导的方法是其中最满意的一个。用该法制备邻二苯酰苯,产量虽低,仅32%但操作简单,原料便宜。反应时,将溴化镁苯加到邻苯二甲酰氯的乙醚液中去,温度控制在-55℃,先生成溴化镁等乙醚的不溶性复合物,把大量的副产物倾出除去后,加水使邻二苯酰苯从复合物
The ortho-disubstituted derivatives of benzene are very difficult to prepare and can not usually be synthesized in the usual way. O-dibenzoylbenzene (I) and o-dibenzoylbenzene (Ⅱ), which are useful compounds, have not been reported in the literature. The authors studied them and the methods now reported are one of the most satisfying. With this method to prepare o-dibenzoylbenzene, the yield is low, only 32% but the operation is simple, cheap raw materials. During the reaction, the magnesium bromide is added to the ether solution of phthaloyl chloride, the temperature is controlled at -55 ° C., the insoluble compound of diethyl ether such as magnesium bromide is firstly removed, a large amount of by-products are poured out, Add water to o-dibenzoylbenzene from the complex