Direct transition metal-free arylation of benzene has been achieved using a combination of various aryl halides and N,N′-bis(salicylidene)ethylenediamine as a new ligand and catalyst. This facile one-pot reaction is reported as a new CH functionalization protocol for the synthesis of biaryls. In this research, 18-crown-6 and several Schiff-bases were tested and among them, N,N′-bis(salicylidene)ethylenediamine was found to be a great catalyst for this cross-coupling.

中文翻译：

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在N，N'-双（水杨基）亚乙基二胺作为有机催化剂存在下，未活化的苯与芳基卤化物的无过渡金属和无碱介导的转化芳基化作用

通过使用各种芳基卤化物和N，N'-双（水杨基）亚乙基二胺作为新的配体和催化剂的组合，已经实现了苯的无过渡金属直接芳基化。据报道，这种简便的一锅反应是联芳基合成的新的C H功能化方案。在这项研究中，测试了18-crown-6和几种Schiff碱，其中N，N'-双（水杨基）亚乙基二胺被发现是这种交叉偶联的良好催化剂。