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• W2081595444 abstract "Grafting of [W(≡NAr)(=CH t Bu)(2,5-Me 2 NC 4 H 2 ) 2 ] on a silica partially dehydroxylated at 700°C (SiO 2- (700) ) generates the corresponding monosiloxy complex [(≡SiO)W(≡NAr)(=CH t Bu)(2,5-Me 2 NC 4 H 2 )] as the major species (≈90%) along with [(≡SiO)W(≡NAr)(CH 2 t Bu)(2,5-Me 2 NC 4 H 2 ) 2 ], according to mass balance analysis, IR, and NMR studies. This heterogeneous catalyst displays good activity and stability in the metathesis of propene. Very importantly, solid state NMR spectroscopy allows observation of the propagating alkylidene as well as stable metallacyclobutane intermediates. These species have the same reactivity as the initial surface complex [(≡SiO)W(≡NAr)(=CH t Bu)(2,5-Me 2 NC 4 H 2 )], which shows that they are the key intermediates of alkene metathesis." @default.
• W2081595444 created "2016-06-24" @default.
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• W2081595444 date "2008-08-26" @default.
• W2081595444 modified "2023-10-18" @default.
• W2081595444 title "Direct observation of reaction intermediates for a well defined heterogeneous alkene metathesis catalyst" @default.
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• W2081595444 doi "https://doi.org/10.1073/pnas.0802147105" @default.
• W2081595444 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2527876" @default.
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