Highly active silica gel-supported metathesis (pre) catalysts

Highly active Hoveyda-Grubbs and Hoveyda-Blechert type (pre)catalysts, immobilized on silica gel, are presented. These (pre)catalysts are synthesized in a few steps from readily available precursors and demonstrate high activity in a number of test metathesis reactions. The catalyst is easily separated by simple filtration of the non-swelling material.