Method for preparation of ruthenium-based metathesis catalysts with chelating alkylidene ligands
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United States of America Patent
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Feb 7, 2017
Grant Date -
Dec 18, 2014
app pub date -
Aug 28, 2014
filing date -
May 7, 2009
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Abstract
The invention relates to a method for preparation of ruthenium-based carbene catalysts with a chelating alkylidene ligand (“Hoveyda-type catalysts”) by reacting a penta coordinated ruthenium (II)-alkylidene complex of the type (L) (Py)X1X2Ru(alkylidene) with a suitable olefin derivative in a cross metathesis reaction. The method delivers high yields and is conducted preferably in aromatic hydrocarbon solvents. The use of phosphine-containing Ru carbene complexes as starting materials can be avoided. Catalyst products with high purity, particularly with low Cu content, can be obtained.
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