The synthesis of novel self-supported thiourea-PdCl2 complexes is described. The heterogeneous catalysts exhibited high catalytic activities in the Suzuki coupling reaction of aryl bromides and aryl boronic acids in neat water under aerobic conditions. Moreover, the catalysts could be easily reused without diminishing the catalytic activity.
A novel strategy to synthesize heterogeneous star-shaped oxime-palladacycle catalysts, which exhibited good catalytic activity and recyclability in the Suzuki coupling of aryl bromides and chlorides, was described.
The invention provides N,N′-disubstituted monothiourea or bis-thiourea-Pd(0) complexes that are useful as catalysts for palladium-catalyzed Heck reaction of aryl iodides and bromides with olefins, and as catalysts for palladium catalyzed Suzuki reactions of organoboric compounds and aryl halides.