Table 4.
S-Arylation in the presence of FeCI3. 
| FeCI3 | GC Yield (%) |
|---|---|
| >98% (Merck) | 91 (ref. 3f) |
| >98% (Aldrich) | 4 |
| >99.99 (Aldrich) | 2 |
| >99.99% + 10ppmCu2O | 42 |
| >99.99% + 100 ppm Cu2O | 99 |
| >99.99% + 1000 ppm Cu2O | 93 |
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