Grubbs‐type catalysts were immobilized in form of supported ionic liquid phase (SILP) materials and applied in the gas‐phase cross‐metathesis of various substrates in order to study the effect of ethene on catalyst activity and stability in detail. From our theoretical and experimental findings we suggest that ethene causes temporary inhibition effects due to a reversible shift of ruthenium complexes from the productive catalytic cycle towards unproductive, dormant ruthenium species. By avoiding the presence of ethene, constant catalytic activity and selectivity for more than 20 days of continuous operation could be realized.
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Scholz et al. (2011) studied this question.
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