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Gold(III) chloride Gold(III) chloride Gold(III) chloride
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Gold(III) chloride, traditionally called auric chloride, is a chemical compound of gold and chlorine. With the molecular formula AuCl3, the name gold trichloride is a simplification, referring to the empirical formula. The Roman numerals in the name indicate that the gold has an oxidation state of +3, which is common for gold compounds. There is also another related chloride of gold, gold(I) chloride (AuCl). Chloroauric acid, HAuCl4, the product formed when gold dissolves in aqua regia, is sometimes referred to as "gold chloride" or "acid gold trichloride". Gold(III) chloride is very hygroscopic and highly soluble in water as well as ethanol. It decomposes above 160°C or in light.
Application
Gold trichloride is one of the most common gold compounds and is therefore commonly used as a starting point for the synthesis of many other gold compounds. For example, water-soluble cyanide complexes -- KAu(CN)4: AuCl3 + 4KCN → KAu(CN)4 + 3KCl
Gold (III) salts, especially NaAuCl4 (prepared by reaction of AuCl3 with NaCl), replace the toxic mercury (II) salts as catalysts for alkyne reactions. For example, methyl ketones are prepared by the water collaboration of terminal alkynes.
Gold trichloride is also used as a catalyst in the amination of alkynes.
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