He added mercuric cyanide to form the compound palladium ( II ) cyanide, which was heated to extract palladium metal.
2.
The Koenigs Knorr reaction can be performed with alternative promoters such as various heavy metal salts including mercuric bromide / mercuric oxide, mercuric cyanide and silver triflate.
3.
In his attempts to produce pure platinum metal in 1804, W . H . Wollaston added mercuric cyanide to a solution of impure platinum metal in aqua regia.
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