Abstract
The use of both heterogeneous and homogeneous gold catalysts for the reactions of alkynes is described. The reaction of ethyne with hydrogen chloride to make vinyl chloride monomer is initially described using gold supported on activated carbon. This reaction involves Au3+ as the reactive species and it is now known that higher alkynes can also be hydrochlorinated with the products of Markovnikov addition being formed. Subsequently, there is now a rich chemistry involving cationic gold or gold complexes as homogeneous catalysts for a very broad range of reactions involving alkynes, and some examples are discussed, including the nucleophilic addition of amines and alcohols to alkynes. Given the range of reactions that gold catalyses as a homogeneous catalysts this may be indicative that many more heterogeneously catalysed reactions using gold can be expected to be discovered.
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