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Besides highly sophisticated iron catalysts, all the other first\u2010row transition metal complexes have only led to poor activities and selectivities. Herein, we show that the cobalt\u2010tetraphenylporphyrin complex is a competent catalyst for the aerobic oxidation of styrenes into ketones with silanes as the hydrogen sources. Remarkably, under room temperature and air atmosphere, the reactions were exceedingly fast (up to 10\u2005minutes) with a low catalyst loading (1\u2005mol\u2009%) while keeping an excellent chemo\u2010 and Markovnikov\u2010selectivity (up to 99\u2009% of ketone). Unprecedently high TOF (864\u2005h<jats:sup>\u22121<\/jats:sup>) and TON (5,800) were reached for the oxidation of aromatic olefins under these benign conditions. Mechanistic studies suggest a reaction mechanism similar to the Mukaiyama\u2010type hydration of olefins with a change in the last fundamental step, which controls the chemoselectivity, thanks to a unique hydrogen bonding network between the ethanol solvent and the cobalt peroxo intermediate.<\/jats:p>","DOI":"10.1002\/anie.202316825","type":"journal-article","created":{"date-parts":[[2023,12,1]],"date-time":"2023-12-01T13:07:47Z","timestamp":1701436067000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":24,"title":["Markovnikov\u2010Selective Cobalt\u2010Catalyzed Wacker\u2010Type Oxidation of Styrenes into Ketones under Ambient Conditions Enabled by Hydrogen Bonding"],"prefix":"10.1002","volume":"63","author":[{"given":"Naba","family":"Abuhafez","sequence":"first","affiliation":[{"name":"Univ Rennes, CNRS, ISCR-UMR6226  35000 Rennes 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