Olefin metathesis {is a|is really a|is actually a|can be a|is often a|is usually a} versatile {strategy|technique|method|approach|tactic} for large-scale olefin interconversion, {yet|however|but} mechanistic {details|particulars|specifics|information|facts} {over|more than} industrial heterogeneous catalysts have remained ambiguous for decades. {Here|Right here}, from rigorous kinetic measurements, spectroscopic {studies|research}, and computational modeling of propylene metathesis {over|more than} model and industrial WOx/SiO2 catalysts, we {identify|determine|recognize} a hitherto unknown {site|website|web site|internet site|web-site|web page} renewal and decay cycle, mediated by proton transfers involving proximal Brønsted acidic OH groups, which operates concurrently {with the|using the|with all the|together with the} classical Chauvin cycle. We show how this cycle {can be|may be|could be|might be|is often|is usually} manipulated {using|utilizing|making use of|employing|working with|applying} {small|little|tiny|modest|smaller|compact} quantities of promoter olefins to drastically {increase|improve|boost|enhance|raise} steady-state propylene metathesis {rates|prices} by {up to|as much as} 30-fold at 250oC with negligible promoter consumption. The {increase|improve|boost|enhance|raise} in activity and considerable reduction of operating temperature {requirements|specifications|needs} {were|had been|have been} also observed on MoOx/SiO2 catalysts, {showing|displaying} that this {strategy|technique|method|approach|tactic} is {general|common|basic} {and can|and may} address {major|significant|main|key|big|important} roadblocks {associated with|related to|connected with|linked to} industrial metathesis processes. 1450879-67-0 Order Lenalidomide-5-Br Data Sheet PMID:24914310
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