Alkynes　are　readily　available　and　multifunctional　synthetic　intermediates,　but　their　1,1-oxofunctionalization　remains　challenging.　Herein,　we　report　a　1,1-oxycarbonation　of　terminal　alkynes　to　construct　ketones　through　sequential　borylation,　1,2-carbon　migration,　and　oxidation　with　Oxone　as　the　proton　source　and　oxidant.　The　synthetic　potential　of　this　transformation　is　showcased　by　the　broad　functional　groups,　scale-up　synthesis,　and　diverse　product　transformations.