Title : Development of new Pd(0) catalysts immobilized on silica-gel : Study of reactivity according to stationary phases for Suzuki-Miyaura coupling reaction in water
Typically, diverse organic reactions using heterogeneous catalysts are less reactive than those using homogeneous catalysts. Several functionalized supporting bodies have been developed to solve this problem. In this study, we have synthesized new supporting bodies using 3-aminopropyl functionalized silica-gels which are reverse phase and normal phase. To the supporting bodies obtained, Pd(II) was loaded on the silica-gel supporting bodies and Pd(0) catalysts were obtained through NaBH4 reduction. Therefore, new heterogeneous palladium catalysts were synthesized. In addition, reusability was proven by recycle tests. By using these catalysts, Suzuki-Miyaura coupling reactions have been carried out in the aqueous system.
As a result, the reverse phase silica-gel catalyst has shown better reactivity than the normal phase silica-gel one. It is expected that this reverse phase silica-gel palladium catalyst can be applied to diverse organic reactions in water such as hydrogenation and other coupling reactions.