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I shortened the section about metal scavengers. It previously mentioned several commercial products. This was in the article for several years, so it is not clear whether these specific products are even manufactured. There may be better ones now. However, the article cannot list even the most popular metal scavengers unless it also lists, for example, the main suppliers of phosphines and carbene ligands for palladium cross-coupling reactions. The products are interesting and important, but rules for promotional uses of Wikipedia are strict. See WP:PROMO. Roches (talk) 16:35, 14 October 2015 (UTC)