Serendipitous Discovery of the Catalytic Hydroammoniumation and Methylamination of Alkynes

The gold rush: A cationic gold(I) complex, supported by a CAAC ligand, promotes the intramolecular addition of NH or NMe bonds (from ammonium salts or tertiary amines, respectively) to carbon–carbon triple bonds; the same complex allows for the isolation of vinylgold intermediates. X=(C6F5)4B. CAAC=cyclic (alkyl)(amino)carbene.