[Poly(styryl)phenanthroline]palladium as heterogeneous catalyst for heck arylation using iodobenzene

✍ Scribed by Zhang Zhuangyu; Hu Hongwen; Kao Tsi-Yu

• Book ID: 103956167
• Publisher: Elsevier Science
• Year: 1990
• Weight: 461 KB
• Volume: 12
• Category: Article
• ISSN: 0923-1137
• DOI: 10.1016/0923-1137(90)90073-d

✦ Synopsis

The effects of different bases on Heck arylation catalyzed by the polymeric catalyst @ -Ph-Phen. Pd have been studied. The yield of product and the lifetime of the catalyst are influenced by the nature of the base used. The leaching of palladium from the polymeric catalyst is caused mainly by the competitive complexation of the ligands existing in the reaction media towards the metal. When tributylamine is replaced by DMF-H:O-NaOAc, the catalyst can be easily recovered and reused, the yields are higher and the products are found to be more pure. For the reaction of acrylamide with iodobenzene, even after ten consecutive runs the recovered catalyst still has high catalytic activity. In the DMF-H20-NaOAc system, the catalyst can also tolerate the presence of a variety of functional groups," acrylamide could be introduced to react with substituted iodobenzenes in good yields.