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Highly Efficient Ruthenium Catalysts for the Formation of Tetrasubstituted Olefins via Ring-Closing Metathesis

2007; American Chemical Society; Volume: 9; Issue: 8 Linguagem: Inglês

10.1021/ol0705144

1523-7060

Ian C. Stewart, Thay Ung, Alexandre A. Pletnev, Jacob M. Berlin, Robert H. Grubbs, Yann Schrodi,

Fuel Cells and Related Materials

A series of ruthenium-based metathesis catalysts with N-heterocyclic carbene (NHC) ligands have been prepared in which the N-aryl groups have been changed from mesityl to mono-ortho-substituted phenyl (e.g., tolyl). These new catalysts offer an exceptional increase in activity for the formation of tetrasubstituted olefins via ring-closing metathesis (RCM), while maintaining high levels of activity in ring-closing metathesis (RCM) reactions that generate di- and trisubstituted olefins.