Au(I)-Catalyzed Cycloisomerizations Terminated by sp3 C--H Bond Insertion.

The article discusses the importance of cationic gold in chemistry in the U.S. It states that cationic gold complexes have emerged as powerful acids capable of promoting a diverse range of enyne cycloisomerization reactions. It is discussed that in these reactions, the gold catalyst not only serves to activate the alkyne toward nucleophilic addition, but also plays a role in stabilizing the cationic intermediates produced in the cyclization event.