Synthesis and reactivity of molybdenum imido alkylidene bis-pyrazolide complexesElectronic supplementary information (ESI) available: Fig. S1-S9. See DOI: 10.1039/c0dt00315h

Reaction of Li(3,5-R 2 -pyrazolide) (R = t Bu or Ph, dXpz) with Mo(NAr)(CHCMe 2 Ph)(OTf) 2 (DME) yields Mo(NAr)(CHCMe 2 Ph)(dXpz) 2 in good yield. These complexes react with alcohols or the surface silanols of silica, to yield bis-alkoxy and surface mono-siloxy alkene metathesis catalysts, respectively. The title complexes react with alcohols or the surface silanols of silica, to yield bis-alkoxy and surface mono-siloxy alkene metathesis catalysts, respectively.