Nickel/magnesium–lanthanum mixed oxide catalyst in the Kumada-coupling
作者:Árpád Kiss、Zoltán Hell、Mária Bálint
DOI:10.1039/b919246h
日期:——
A new, heterogeneous, magnesiumâlanthanum mixed oxide solid base-supported nickel(II) catalyst was developed. The catalyst was used successfully in the Kumada coupling of aryl halides, especially aryl bromides. The optimal reaction conditions of the coupling were determined.
Palladium(II)-Catalyzed Coupling of Electron-Deficient Arenes via C–H Activation
作者:Lihong Zhou、Wenjun Lu
DOI:10.1021/om300114e
日期:2012.3.26
Homocoupling and cross-coupling of electron-deficient arenes, including nitrobenzene, (trifluoromethyl)benzene, ethyl benzoate, etc., have been developed to afford biaryls using a catalytic system of Pd(OAc)(2)/trifluoroacetic acid (TFA)/O-2 or K2S2O8. The crucial step is to tune the concentrations of arenes and the loading of TFA carefully to enhance the reaction rates and the selectivity of these couplings involving dual C-H activation.