Ethylenediamine-Functionalized Resin-Supported Pd(0) Complex: An Effective and Recyclable Catalyst for Heck Vinylation

• 来源期刊: 中国化学（英文版）
• 年，卷（期）: 2006,（10）
• 页码范围: 1309-1314
• 页数: 6页
• 语种: 英文

摘要

The ethylenediamine-functionalized resin-supported Pd(0) complex was prepared from PdCl2 and ethylenediamine-functionalized chloromethylated polystyrene, followed by reduction with KBH4. The complex was characterized by FT-IR, XRD, BET, SEM and EDS. The resin-supported catalyst exhibited high catalytic activity in the Heck reaction and could be reused up to 17 times in NMP or 16 times in DMF at 90 ℃ in the Heck reaction of iodobenzene with acrylic acid. The leaching investigation disclosed that the palladium leaching was caused by the interaction of iodobenzene with the metal Pd(0) on supported catalyst. The leached palladium species in filtrate was very stable and could be reused five times after the solid catalyst was filtered off. A cross-transfer test in recycling in the presence of additional carbon disclosed that the soluble leached palladium species had much higher catalytic activity than supported and/or adsorbed palladium in solid-solution heterogeneous Heck reaction.