Rhenium-Catalyzed [4 + 1] Annulation of Azobenzenes and Aldehydes via Isolable Cyclic Rhenium(I) Complexes
作者:Xiaoyu Geng、Congyang Wang
DOI:10.1021/acs.orglett.5b00938
日期:2015.5.15
The first Re-catalyzed [4 + 1] annulation of azobenzenes with aldehydes was developed to furnish 2H-indazoles via isolable and characterized cyclic ReI-complexes. For the first time, the acetate-acceleration effect is showcased in Re-catalyzed C–H activation reactions. Remarkably, mechanistic studies revealed an irreversible aldehyde-insertion step, which is in sharp contrast to those of previous Rh-
Electrosynthesis of Azobenzenes Directly from Nitrobenzenes
作者:Yanfeng Ma、Shanghui Wu、Shuxin Jiang、Fuhong Xiao、Guo‐Jun Deng
DOI:10.1002/cjoc.202100470
日期:2021.12
The electrochemical reduction strategy of nitrobenzenes is developed. The chemistry occurs under ambient conditions. The protocol uses inert electrodes and the solvent, DMSO, plays a dual role as a reducing agent. Its synthetic value has been demonstrated by the highly efficient synthesis of symmetric, unsymmetric and cyclic azo compounds.
convergent paired electrochemical method was developed for the synthesis of azoxy and azocompounds starting from the corresponding nitroarenes. We propose a unique mechanism for electrosynthesis of azoxy and azocompounds. We find that both anodic and cathodic reactions are responsible for the synthesis of these compounds. The synthesis of azoxy and azo derivatives have been successfully performed in an undivided
Study of Halogen-Mediated Weak Interactions in a Series of Halogen-Substituted Azobenzenes
作者:Maheswararao Karanam、Angshuman Roy Choudhury
DOI:10.1021/cg400967k
日期:2013.11.6
hydrogen bond lies in the range from −0.8 to −1.0 kcal/mol, while that for the C–X···X–C interaction has been found to be −0.35 kcal/mol for the X = Cl interaction and −0.73 kcal/mol for the X = Br interaction. Further, the analysis of these interaction by atoms in molecules (AIM) theory indicates that the electron densities (ρc) at the bond critical points (BCP) for C–H···F and C–X···X–C (X = Cl and Br)
Site-Selective C-H Amidation of Azobenzenes with Dioxazolones under Rhodium Catalysis
作者:Neeraj Kumar Mishra、Yongguk Oh、Mijin Jeon、Sangil Han、Satyasheel Sharma、Sang Hoon Han、Sung Hee Um、In Su Kim
DOI:10.1002/ejoc.201601096
日期:2016.10
The rhodium(III)-catalyzed amidation reaction of azobenzenes with dioxazolones is described. This strategy allows the facile and efficient construction of highly substituted ortho-amidated azobenzenes via direct C-H cleavage approach. A range of substrate scope, excellent levels of chemoselectivity as well as high functional group tolerance were observed. In addition, this protocol was used to generate