| Abstract
| - The reaction of [W(NAr)(CHtBu)(CH2tBu)2] (1;Ar = 2,6-iPrC6H3) with a silica partially dehydroxylated at 700°C, SiO2-(700), gives syn-[(⋮SiO)W(NAr)(CHtBu)(CH2tBu)](2) as a major surface species, which was fully characterizedby mass balance analysis, IR, NMR, EXAFS, and DFT periodiccalculations. Similarly, complex 1 reacts with [(c-C5H9)7Si7O12SiOH] to give [(SiO)W(NAr)(CHtBu)(CH2tBu)] (2m), whichshows similar spectroscopic properties. Surface complex 2 is ahighly active propene metathesis catalyst, which can achieve aTON of 16 000 within 100 h, with only a slow deactivation.
- A well-defined, silica-supported W imido alkylidene complex, which has been prepared and fully characterized by mass-balance analysis, IR, NMR, EXAFS, and DFT periodic calculations, is a highly active propene metathesis catalyst and can achieve a TON of 16 000 within 100 h with only a slow deactivation.
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