Heck Cross-Coupling Reactions in Ionic Liquid mediated Pd Nanocatalysts

Abstract

: We straightforwardly synthesized 18 different types of palladium nanoparticles by using a series of palladium metal precursors and ionic liquids. All the materials went for XRD, TEM, and ICP-OES analysis, before going to Heck cross-coupling reaction as a catalyst. We evaluated the catalytic performance of our developed IL#Pd MNP catalyst over Heck cross-coupling reaction between different terminal olefins with various 3-iodo-benzopyrones, including sterically hindered, electron-rich, electron neutral and electron-deficient systems. We obtained the Heck cross-coupling reaction product in good to average yield under phosphine free reaction condition with an added advantage of 6 times catalyst recycling.

The Mizoroki‐Heck Reaction in Tunable Aryl Alkyl Ionic Liquids

“…Without mercury, the yield after three hours is 87 %. The yield after one hour without any mercury is 39 % (see Table 4, entry 2) This could indicate that the reaction is catalyzed via palladium nanoparticles, [72][73][74] whose activity is quenched via the amalgamation with mercury. [75] The reaction therefore might proceed via Pd nanoparticles that are stabilized by the imidazolium cation or the stabilized Pd colloids serve as a reservoir for the active Pd species.…”