A simple cobalt catalyst system for the efficient and regioselective cyclotrimerisation of alkynes.
The intermolecular cyclotrimerisation of terminal and internal alkynes can be catalysed by simple cobalt complexes such as a CoBr2(diimine) under mild reaction conditions when treated with zinc and zinc iodide with high regioselectivity in excellent yields.
Hilt
Gerhard
G
Fachbereich Chemie, Philipps-Universitat Marburg, Hans-Meerwein-Strasse, 35032, Marburg, Germany. Hilt@chemie.uni-marburg.de
Vogler
Thomas
T
Hess
Wilfried
W
Galbiati
Fabrizio
F