Palladium supported on triazolyl-functionalized polysiloxane as recyclable catalyst for Suzuki–Miyaura cross-coupling

Palladium supported on aminopropyl-functionalized polymethylsiloxane microspheres: Simple and effective catalyst for the Suzuki–Miyaura C–C coupling

“…Thus, during the catalytic reaction, Pd(II) was reduced to Pd(0) nanoparticles, similarly as it was observed for other catalysts supported on polysiloxane polymers ( Fig. 1) [47,48]. …”

“…This work is certainly a step forward compared to the previous one [48] in which a triazolyl-functionalized polysiloxanes were used. Although in this studies higher amount of catalyst was used (2 mol% versus 0.23 mol% in [48]) the system is much easier to operate and, in particular, separation step is improved.…”

“…However, very few reports have presented on the application of functionalized silicone polymers [44] as catalyst supports. At the same time, polysiloxane-supported palladium has recently been successfully used in the Heck reaction [45,46] and the Suzuki-Miyaura coupling [47,48].…”

“…Although palladium catalysts supported on siloxanes functionalized with imidazole and triazole groups have been successfully recycled [47,48], the separation step has been rather complicated in these systems due to the very small diameter of the beads formed by polysiloxane. Centrifugation has not been efficient and very careful filtration through a thick filter allowed to solve the problem of catalyst recovery.…”

A macrocyclic Pd(II)–Ni(II) complex in Heck and Suzuki reactions

“…Different classes of palladium species have been tested in the Heck and the Suzuki cross-coupling reactions, such as palladacycles [12][13][14][15][16][17] and complexes with N-heterocyclic carbenes [18][19][20][21][22][23]. Good results have also been obtained for immobilized palladium catalysts [24][25][26][27] as well as for Pd(0) nanoparticles [28][29][30].…”