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N-Arylation in the presence of FeCI3 (phenyl amide). 
| FeCI3 | GC Yield (%) |
|---|---|
| >98% (Merck) | 79(ref. 3c) |
| >98% (Aldrich) | 16 |
| >99.99 (Aldrich) | trace |
| >99.99% + 5 ppm Cu2O | 98 |
| >99.99% + 10 ppm Cu2O | 99 |
| no Fe + ligand + 5 ppm Cu2O | 97 |
| no Fe + no ligand + 5 ppm Cu2O | 34 |
