The First OCCCO Pentadentate Chelates:Osmium Mediated Stepwise Oxidations of Terminal Alkynes by Pyridine N-Oxide  

作　　者：Jianfeng Lin Qiannan Xu Xinlei Lin Yuhui Hua Dafa Chen Yonghong Ruan Hong Zhang Haiping Xia 

机构地区：[1]College of Chemistry and Chemical Engineering,Xiamen University,Xiamen,Fujian 361005,China [2]Shenzhen Grubbs Institute,Department of Chemistry,Guangdong Provincial Key Laboratory of Catalysis,Southern University of Science and Technology,Shenzhen,Guangdong 518055,China

出　　处：《Chinese Journal of Chemistry》2020年第11期1273-1279,共7页中国化学（英文版）

基　　金：We gratefully acknowledge the Guangdong Provincial Key Laboratory of Catalysis(No.2020B121201002);NSFC(Nos.U1705254 and 21931002)for their financial support.

摘　　要：of main observation and conclusion Oxygen atom transfer reactions between alkynes and heteroarene N-oxides are currently mediated by transition metal,such as gold,ruthenium or rhodium,but they have never been catalyzed by osmium.Herein,we report stepwise oxidations of terminal alkynes mediated by an osmium carbolong complex,using pyridine N-oxide as the oxidant,yielding novel aldehyde-or carboxylic acid-coordinated osmapentalyne derivatives selectively.The mechanism was illustrated by density functional theory calculations,providing a new route for oxygen atom transfer between heteroarene N-oxides and alkynes.

关 键 词：oxides YIELDING CONCLUSION 

分 类 号：O62[理学—有机化学]