ligands (thus with the proper electronic environment) they can be recycled for at least five times without any depletion in catalytic activity. These results showcase not only the substitution of a noble metal (Ag) by an abundant metal (Cu) in a metal–catalyzed oxidative coupling reaction, but also going from a salt to a supported solid catalyst, of high significance from a sustainable point of view
Elimination and addition reactions. Part 33. Formation and behaviour of carbanions derived from sulphones and nitriles bearing β-′onium substituents
作者:Kenneth N. Barlow、Donald R. Marshall、Charles J. M. Stirling
DOI:10.1039/p29770001920
日期:——
Kinetics of eliminationreactions of β-arylsulphonylethyl- and β-cyanoethyl-ammonium and -sulphonium salts have been measured in ethanolic triethylamine buffers. The reactions show buffer saturation kinetics; at low buffer base concentrations ionisation to form the intermediate carbanion is rate-determining, but at higher buffer base concentrations the intermediate carbanion is formed in a rapidly