Sold in collaboration with BASF metals scavenging agents (MSA’S) are alumina, carbon or silica-based air stable free flowing powders with proprietary surface coatings. These are suitable for the removal of precious and base metal species from organic, aqueous, protic and aprotic reaction mixtures with metal loading capacities up to 13 wt% (depending on metal and process conditions). MSA’s are designed for fixed bed or slurry applications, are temperature stable up to 150/C and do not exhibit swelling seen with polymer-based systems. Metals removed include: Pt, Pd, Rh, Ru, Ir,Ni, Cu, Fe.
FixCat (44-0759), similar to AquaMet (44-0768), is an efficient catalyst in alcohols, halogenated solvents and water, and can be readily immobilized on a variety of solid supports to afford a heterogeneous catalyst. If residual metal cannot be tolerated in the product, these catalysts can get the job done without ever having the metal complex in solution in the first place. Another catalyst with a similar function is StickyCat (44-0765), with its quaternary ammonium appendage that sticks tenaciously to silica gel – offering a way to pretty much quantitatively filter the homogeneous catalyst away from product.
Of course, Apeiron and Strem offer many catalysts beyond FixCat (44-0759) and StickyCat (44-0765) because some substrates just work better with another catalyst. If there is a need for ultra-low residual metal while using other catalysts, there is now a ready solution. SnatchCat (07-2203) Figure 4 is a highly effective scavenger for metals, such as Ru or Pd. Just add a bit to the reaction mixture and filter through silica to afford products with single digit PPM (or less) residual metal.
Have you worked with any of these olefin metathesis catalysts? The Strem and Apeiron Teams would be delighted to hear about your experiences with these products and would be happy to help with any questions.