Palladium nanoparticles supported on modified polystyrene resin as a polymeric catalyst for Sonogashira-Hagihara coupling reactions

Authors : BAHMAN TAMAMI, FATEMEH NOWROOZI DODEJI, SOHEILA GHASEMI

Pages : 880-885

Doi:10.3906/kim-1407-22

View : 17 | Download : 8

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :Pdinsert ignore into journalissuearticles values(0); nanoparticles supported on modified crosslinked polystyrene were synthesized and characterized. Crosslinked polystyrene was reacted with trioxane and chlorotrimethylsilane in the presence of SnCl$_{4}$ to form Merrifield resin. The Merrifield resin was then converted to polymer-bound $\beta $-aminoalcohol and subsequently to $\beta$-aminophosphinite ligand. This polymeric ligand was reacted with PdCl$_{2}$ to obtain a polymeric Pdinsert ignore into journalissuearticles values(0); complex. The TEM image of the Pd catalyst showed good dispersion of catalytic sites. The Pd catalyst exhibits excellent activity and stability in copper-free Sonogashira-Hagihara cross-coupling reactions under aerobic conditions. This protocol can be applied efficiently to the coupling reactions of chloro- as well as iodo- and bromo-arenes. The catalyst can be reused several times without any considerable decrease in its activity.
Keywords : Merrifield support, palladium nanoparticle, Sonogashira coupling