Immobilization of Pd on Nanosilica Dendrimer as SILC: Highly Active and Sustainable Cluster Catalyst for Suzuki-Miyaura Reaction
作者:Hisahiro Hagiwara、Hirokazu Sasaki、Norio Tsubokawa、Takashi Hoshi、Toshio Suzuki、Tetsuya Tsuda、Susumu Kuwabata
DOI:10.1055/s-0029-1219816
日期:2010.8
Palladium acetate was noncovalently immobilized as a supported ionic liquid catalyst (SILC) in a nanosilica dendrimer, PAMDMAM, with the aid of an ionic liquid to form a cluster catalyst of palladium nanoparticles. The pseudo-homogeneous heterogenized catalyst, Pd-nanoPAMDMAM-SILC, was effective for Suzuki-Miyaura reactions of ortho-substituted aryl bromides or aryl triflates without a ligand in 50% aqueous ethanol in air at room temperature. The catalyst could be re-used up to five times in 93% average yield after simple centrifugation. TON reached 176,000.
乙酸钯非共价地固定在纳米二氧化硅树枝状大分子PAMDMAM支持的离子液体催化剂(SILC)中,借助离子液体形成钯纳米粒子簇催化剂。这种伪均相异相化催化剂Pd-nanoPAMDMAM-SILC对室温下空气中50%乙醇水溶液中的无配体邻位取代芳基溴或芳基三氟甲磺酸酯的铃木-宫浦反应有效。催化剂经简单离心后可重复使用多达五次,平均产率为93%。TON达到176,000。