Construction of highly antiaromatic boroles  

作　　者：Weidong Zhang Bingjie Zhang Demei Yu Gang He 

机构地区：[1]School of Science,Xi'an Jiaotong University [2]Frontier Institute of Science and Technology,Xi'an Jiaotong University

出　　处：《Science Bulletin》2017年第13期899-900,共2页科学通报（英文版）

摘　　要：Boroles are five-membered,unsaturated heterocycles with an antiaromatic 4π-electron BC_4 ring.According to Breslow's exten sion of the H(u|¨)ckel rule,the intrinsic antiaromaticity can be attrib uted to the unfavorableπ-electron delocalization of the BC_4 core,in which a vacant p-orbital on boron mediates the conjugation of four ringπ-electrons.The first borole derivative,1,2,3,4,5-pentaphenylborole[PhBC_4Ph_4],was isolated by Eisch and Hota[1]in 1969,but its crystal structure has been determined by X-ray crystallography recently[2].Since the structure of borole was confirmed。Boroles are five-membered, unsaturated heterocycles with an antiaromatic 4π-electron BC4 ring. According to Breslow＇s exten- sion of the Hfickel rule, the intrinsic antiaromaticity can be attrib- uted to the unfavorable π-electron delocalization of the BC4 core, in which a vacant p-orbital on boron mediates the conjugation of four ring re-electrons. The first borole derivative, 1,2,3,4,5-pentaphenyl- borole [PhBC4Ph4], was isolated by Eisch and Hota [1] in 1969, but its crystal structure has been determined by X-ray crystallography recently [21. Since the structure of borole was confirmed, borole chemistry has been seen significant progress. Antiaromaticity is an important feature of boroles, and accordingly, various Lewis acid-base adducts, metal-coordinated and ring-expanded borole complexes have been prepared [3-5]. The high antiaromatic bor- oles has not only been employed as precursor to develop boron- containing compounds, but also played important roles in Lewis acid catalyst, opto-electronic and biotechnology fields [6]. To improve their performance for such applications and explore the new boron species, much effort has been devoted to enhance the antiaromaticity of borole derivatives [7,8].

关 键 词：芳香性 Lewis酸催化剂 X-射线晶体学 硼化合物 生物技术领域 晶体结构 杂环化合物 Π电子 

分 类 号：O613.81[理学—无机化学]