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P. 60-66 /

Development of alkyne metathesis catalysts
It’s a game of give and take

MATTHIAS TAMM*, XIAN WU
*Corresponding author
Technische Universität Braunschweig, Institut für Anorganische und Analytische Chemie Hagenring 30, 38106 Braunschweig, Germany

Abstract

New Schrock type tungsten alkylidynecomplexes were designed and synthesized through highand low oxidation state routes. In particular, the tungstenalkylidyne complexes 2 and 4 bearing the 1,3-di-tertbutylimidazolin-2-iminato group (ImtBuN) exhibit very highcatalytic activities in alkyne metathesis reactions such asalkyne cross metathesis and ring-closing alkyne metathesis.Through the combination of the strong electron-donatingimidazolin-2-iminato ligand and the electron-withdrawingfluorinated alkoxide groups, a “Push-Pull-Situation” isestablished, which is considered to be responsible for theobserved high catalytic efficiency. DFT calculations havebeen used to explain the experimental results and touncover even more active catalysts.


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