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Cover Feature: Visible‐Light‐Assisted Cobalt‐2‐(hydroxyimino)‐1‐phenylpropan‐1‐one Complex Catalyzed Pd/Cu‐Free Sonogashira–Hagihara Cross‐Coupling Reaction (ChemCatChem 4/2018)
Author(s) -
Song JinYi,
Zhou Xuan,
Song He,
Liu Yang,
Zhao HongYan,
Sun ZhiZhong,
Chu WenYi
Publication year - 2018
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201800175
Subject(s) - sonogashira coupling , catalysis , cobalt , aryl , photochemistry , chemistry , palladium , combinatorial chemistry , materials science , organic chemistry , alkyl
The Cover Feature shows an effective and inexpensive strategy for Co(C 9 H 9 NO 2 ) 3 complex‐catalyzed Sonogashira–Hagihara cross‐coupling of aryl bromides containing electron‐rich and electron‐poor substituents with terminal alkynes under visible light irradiation. In their Full Paper, J.‐Y. Song et al. present the structure of the cobalt complex and propose a possible mechanism for the visible light‐assisted Sonogashira–Hagihara coupling reaction. They found that novel diaryl ethynes were afforded in moderate yields under mild conditions. A comparison with the high‐cost palladium catalyst showed that cobalt is a suitable inexpensive catalyst to technologize production. The results show that the Pd/Cu‐free catalytic system enables an efficient process with good functional group tolerance.