Hydrogenation, transfer palladium catalyst preparation

Umani-Ronchi and his co-workers have prepared various new active metals that consist of highly dispersed palladium or nickel on graphite and which selectively catalyse the semi-hydrogenation of acetylenes to Z-olefins. A different catalyst for the same process can be prepared by successive treatment of chloromethylated polystyrene beads with anthranilic acid and palladium chloride. Alternatively, acetylenes can be reduced to Z-oIefins by a catalytic transfer process using sodium phosphinate as the hydrogen donor and an easily prepared lead- or mercury-modified palladium catalyst. ... 

While this manuscript was under preparation, a considerable number of examples of sohd-phase-attached catalysts appeared in the literature which is a clear indication for the dynamic character of this field. These include catalysts based on palladium [131, 132], nickel [133] and rhodium [134] as well applications in hydrogenations including transfer hydrogenations [135, 136] and oxidations [137]. In addition various articles have appeared that are dedicated to immobilized chiral h-gands for asymmetric synthesis such as chiral binol [138], salen [139], and bisoxa-zoline [140] cinchona alkaloid derived [141] complexes. 

Preparation of sodium-[2-(3, 3, 3 - trifluoroprop-l -yl)]-benzenesulfonate The solution is transferred into a hydrogenation flask and activated carbon is added. Under the hydrogen atmosphere the heterogeneous catalyst is formed and the catalytic hydrogenation is carried out. The palladium containing catalyst is separated by filtration and washed with water. 

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