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In carbonyl–olefin metathesis, two π-bonds undergo a cycloaddition-cycloreversion process to form valuable alkenes from simple precursors. Although this synthetic methodology has advanced significantly, further improvements would be greatly facilitated by a clear understanding of whether Lewis-acid-catalyzed carbonyl–olefin metathesis reactions occur via a stepwise or concerted pathway. Here we use 12C/13C kinetic isotope effects (KIEs), 1H/2H KIEs, and Hammett studies to show that prototypicaldoi:10.26434/chemrxiv-2022-nnp81 fatcat:4nqltyhp4ffydc3mteicnflnxu