Perfluoro-tagged Pd catalyst

Haag et al. [43] have recently reported on the supramolecular immobilization of a perfluoro-tagged Pd catalyst on a dendritic polyglycerol ester with a perfluorinated shell and they have investigated its activity in Suzuki coup-... 

Cyclodimerizations of conjugated enynes 22a-22e in the presence of perfluoro-tagged Pd catalyst were reported by Saito et al. [Eq. (6)] [28]. Reactions of enynes 22a-22e were carried out in toluene/hexane/perfluorodecalin with 1 mol% of Pd2(dba)j as palladium source and 8 mol% of perfluoro-tagged phosphane 1 giving the desired products (23a-23e) in moderate to good yield (43-78%). Recovery of the perfluoro-tagged catalyst was possible up to four times. However, IPC atomic emission analysis of the fluorous phase indicated that the concentration of the palladium species decreased significantly. 

Bannwarth and co-workers have recently developed new protocols for the separation and recycling of perfluoro-tagged catalysts without the need for fluorous solvents [25]. They have employed Pd complexes 11c, lid, and 17, immobilized by adsorption on fluorous reversed-phase silica gels (FRPSG) 18 and 19, and demonstrated the application to Suzuki couplings in organic solvents. Coarse-grained... 

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