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Tin Scavenging with SiliaMetS Cysteine & TAAcONa

Organotin compounds are versatile reagents commonly used in organic synthesis. The two main applications are in Stille couplings or in radical reactions. The removal of tin residues can often be an issue due to the well known high toxicity of this metal.
Traditional removal methods for this particular type of impurity are treatment with an aqueous solution of KF, NH4OH or NaOH, or with bases such as DBU. However, the efficiency of these methods can vary and may be inapplicable for particular compounds.
SiliaMetS Cysteine & TAAcONa can be used as an efficient method to remove tin residues from organic mixtures as demonstrated by the exemples below.

case-study-tin-scavenging

Tin Scavenging using SiliaMetS Cysteine (TAAcONa)
Reactions Inital
Concentration
SiliaMetS Cysteine SiliaMetS TAAcONa
4 eq., 4 h, 22°C [2 treatments] 8 eq., 4 h, 22°C 4 eq., 4 h, 22°C [2 treatments] 8 eq., 4 h, 22°C 4 eq., 16 h, 22°C
Stille coupling #11 3 385 ppm 99 % 64 % 96 % 62 % -
Stille coupling #21 981 ppm 90 % 66 % 66 % 50 % -
Radical Reduction 4 090 ppm 92 % 88 % 90 % 90 % 90 %
1Pd residues were completely removed after only one treatment with SiliaMetS Cysteine.