Ag NMR as a tool for mechanistic studies of Ag-catalyzed reactions: evidence for in situ formation of alkyn-1-yl silver from alkynes and silver salts.
[Structure: see formula]. As demonstrated by 1H, 13C, and 109Ag NMR, a pi-alkyne-Ag complex and then an alkynyl silver are in situ formed from alkyne and silver salt in conditions related to those used for Ag-catalyzed alkynylation or for Ag/Pd-catalyzed sp-sp2 cross-coupling reactions. This finding allows for a rationale of the mechanisms of these reactions.
Létinois-Halbes
Ulla
U
Laboratoire de Synthèse et Réactivité Organique, 4 Rue Blaise Pascal, 67000 Strasbourg, France, and Institut für Analytische Chemie, Linnéstrasse 3, 04301 Leipzig, Germany.
Pale
Patrick
P
Berger
Stefan
S