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Multiple Metal Scavenging with SiliaMetS
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SiliaMetS can be used to remove multiple metals in the same reaction with excellent efficiency. The Negishi coupling presented below was performed and SiliaMetS was used to remove simultaneously residual zinc, palladium and iron present after the reaction.
| Multiple Removal Scavenging Results | |||
| SiliaMetS | Palladium | Iron | Zinc |
| SiliaMetS Cysteine | 95 % | > 99 % | 98 % |
| SiliaMetS DMT | 83 % | 93 % | 99 % |
| SiliaMetS Imidazole | 84 % | 91 % | 97 % |
| SiliaMetS TAAcONa | 97 % | > 99 % | > 99 % |
| Initial Concentration: | 188 ppm in THF | 110 ppm in THF | 6 ppm in THF |
| Conditions: 4 eq. of SiliaMetS (according to palladium), 4 h, 22°C. | |||
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SiliaMetS TAAcONa nec (R69230B)
SiliaMetS TAAcONa or (or SiliaMetS Triaminetetraacetate, sodium salt) is a silica bound metal scavenger for Pd(II), Ni(II) and Cu. It is the supported version of EDTA in its sodium salt form. It is an effective scavenger for metals in higher oxidation state, 2+ or higher. -
SiliaMetS DMT (Dimercaptotriazine) (R79030B)
SiliaMetS DMT is the silica - bound equivalent of 2,4,6 - trimercaptotriazine (trithiocyanuric acid, TMT). It is a versatile metal scavenger for a variety of metals and the preferred metal scavenger for ruthenium catalysts and hindered Pd complexes. Best scavenger for: As, Ir, Ni, Os, Pd, Pt, Rh, Ru & Se. Good scavenger for: Cd, Co, Cu, Fe, Sc & Zn. -
SiliaMetS Imidazole (IMI) (R79230B)
SiliaMetS Imidazole (Si-IMI) is a versatile metal scavenger for a variety of metals under a wide range of conditions and the preferred metal scavenger for iron catalysts. Best scavenger for: Cd, Co, Cu, Fe, Ir, Li, Mg, Ni, Os, W & Zn. Good scavenger for: Cr, Pd & Rh. It can also be used as an amine base in systems that are generally sensitive to basic conditions compared to other SiliaMetS supported bases. -
SiliaMetS Cysteine (CYS) (R80530B)
SiliaMetS Cysteine (Si-Cys) is the silica bound equivalent of the amino acid Cysteine. It is a versatile metal scavenger for a variety of metals including Pd, Sn, Ru, Pt, Cu, Rh, Cd and Sc under a wide range of conditions and the preferred metal scavenger for tin residues.
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