Palladium nanoparticles supported on a poly(N-vinyl-2-pyrrolidone)-modified mesoporous carbon nanocage as a novel heterogeneous catalyst for the Heck reaction in water

Recent developments in C–C bond formation catalyzed by solid supported palladium: a greener perspective

The world today is struggling to achieve sustainable means for synthetic processes. Standing at this juncture, we need to develop and implement greener and reusable approaches towards organic synthesis. Transition metals especially palladium is a wonder element which has the ability to catalyze a range of useful organic syntheses. However, the expensive nature of palladium has urged synthetic chemists to search for protocols where a single palladium source may be used repeatedly in successive reactions, thus making the overall process cost effective. Palladium when anchored to solid supports leads to catalytic systems which can be easily separated from the organic phase post reaction and can be reused in successive cycles. Not only does this make the process economically viable but also ensures that no metal contaminates the purity of the final organic product. In this review we will highlight the recent developments in C–C bond formation (which is by far the most fundamental mode of bond making in organic synthesis) via the use of solid supported palladium catalytic systems. We will use this opportunity to illustrate the synthetic processes from a greener sustainable point of view which we feel is of utmost relevance in the current scientific scenario.

Facile one-pot tandem reductive amination of aldehydes from nitroarenes over a hierarchical ZSM-5 zeolite containing palladium nanoparticles

Palladium nanoparticles embedded in hierarchical zeolite act as an acid–metal bifunctional catalyst for efficient reductive amination of aldehyde from nitroarenes.

Preparation and characterization of Ni/mZSM-5 zeolite with a hierarchical pore structure by using KIT-6 as silica template: an efficient bi-functional catalyst for the reduction of nitro aromatic compounds

Ni/mZSM-5 hierarchical zeolite and the acidic form of it were prepared as novel bi-functional catalysts which showed excellent activity for reduction of nitro aromatic compounds in aqueous medium at room temperature.

Aryl alkyl carbene–Pd complex assisted C–Cl bond activation: an unprecedented cross-coupling route to trans-stilbenes

A MW assisted phosphine-free coupling of aryl chlorides with 1-(bromoethyl)benzene, at low Pd concentration for the synthesis oftrans-stilbene derivatives is presented. The reaction is believed to be mediatedviaPd–carbene intermediate.

PdCl2(1-methylimidazole)2-catalysed Suzuki–Miyaura and Mizoroki–Heck Reactions Performed in Neat Water

PdCl2(1-methylimidazole)2 was an effective catalyst in neat water for the Suzuki–Miyaura and Mizoroki–Heck reactions of aryl bromides and iodides with, respectively, arylboronic acids and acrylic acid. Under optimal conditions, the products, variously substituted biphenyls and monosubstituted trans-cinnamic acids, respectively, were formed in good to almost quantitative yields.