Titania-supported iridium catalysts for dehydrogenative synthesis of benzimidazoles  

作　　者：Kenji Wada Han Yu Qi Feng 

机构地区：[1]Department of Chemistry for Medicine,Kagawa University,Miki-Cho,Kita-Gun,Kagawa 761-0793,Japan [2]Department of Advanced Materials Science,Kagawa University,Takamatsu,Kagawa 761-0396,Japan

出　　处：《Chinese Chemical Letters》2020年第3期605-608,共4页中国化学快报（英文版）

基　　金：supported by the Japan Society for the Promotion of Science KAKENHI(No.JSPS,17H03458)。

摘　　要：In this review,development of supported catalysts for the dehydrogenative synthesis of benzimidazoles from primary alcohols and 1,2-phenyIenediamine derivatives is briefly summarized.Among them,titania-supported iridium catalysts showed excellent activities under mild reaction conditions.Remarkably,the low-temperature activity of iridium catalyst was significantly affected by titania supports,and the reaction of 1,2-phenylenediamine and benzyl alcohol in the presence of rutilesupported catalysts proceeded smoothly at 100℃to give 2-phenylbenzimidazole in high yields of up to 88%,On the other hand,catalysts supported on anatase generally showed poor activity at 100℃.A significant relationship between CO uptake and the activity of titania-supported catalysts has been reported,indicating that well-reduced iridium species on rutile would be responsible for the predominant catalytic activity.The present results suggest the importance of the selection of suitable titania supports for the iridium catalysts.

关 键 词：BENZIMIDAZOLE IRIDIUM TITANIA Heterogeneous CATALYSTS DEHYDROGENATION 

分 类 号：O643.36[理学—物理化学] O626.23[理学—化学]