Pyrazole and benzothiazole palladacycles: stable and efficient catalysts for carbon–carbon bond formation
作者:Xinjie Gai、Ronald Grigg、M. Imran Ramzan、Visuvanathar Sridharan、Simon Collard、Jayne E. Muir
DOI:10.1039/b005452f
日期:——
Cyclopalladated phosphine free pyrazole complexes 1 and benzothiazole complexes 2 are excellent catalysts for the Heck vinylation of aryl iodides and termolecular queuing cascades, leading to turnover numbers of >106 in some cases, at moderate temperatures; these catalysts show high thermal stability and are not sensitive to moisture and air.
Cyclopalladated, phosphine free, 8-methyl quinoline based complexes (2a–j) are excellent catalysts for the Heck vinylation of aryl iodides and bromides with turnover numbers of greater than 25 million observed in some cases. The catalysts are air and moisture stable.