Synthesis of heterogeneous phosphine-free palladium-based catalyst assemblies via solid phase extraction and their characterization

The synthesis of heterogeneous phosphine-free palladium-based catalyst materials was accomplished in a straightforward, two-step reaction using solid phase extraction. This involves functionalization of solid inorganic sorbents such as aluminium oxide, silica gel and titanium dioxide with organic chelate, i.e. dimethyl glyoxime (DMG). The above functionalized materials were transformed into palladium ion-sorbed DMG-functionalized materials by solid phase extraction. The synthesized materials were characterized by a variety of experimental techniques. One of the best-synthesized materials was used for the catalytic evaluation using the Heck reaction. Highly crystalline materials with a controlled size, porosity and uniform distribution of the palladium ion were prepared by this method. (C) 2004 Elsevier B.V. All rights reserved.