Abstract
A polymer-incarcerated (PI) palladium catalyst was practically prepared from Pd(NO3)2 and a polystyrene-based copolymer 1 with NaOAc under reducing conditions. Thus, when a solution of 1 with those reagents was heated for three hours, a polymer-supported palladium was successfully formed, which was coacervated with hexane and crosslinked to give PI Pd. In the presence of 5 mol% Pd of PI Pd catalyst, the Mizorogi-Heck reaction of PhI with ethyl acrylate and K2CO3 in NMP was performed to afford ethyl cinnamate in 94% yield. The Suzuki-Miyaura couplings of aryl bromides or 4-acetyl chlorobenzene with arylboronic acids (1.5 equiv) were also examined to give biphenyl derivatives in 95% quantitative yields (8 examples). The PI Pd catalyst was recyclable two times for these reactions.
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