[macman104]

In reactions such as the Baeyer-Villiger Oxidation an R group migrates.  The reaction can be regiospecific if there is a difference in the available R groups to stabilize a positive charge as it migrates.  This follows the normal trend of carbocation stability.  However, just now, looking over the mechansim, the R group "brings" it's bond with it to the oxygen.  So where does this positive charge come from that the R group needs to stabilize if it "brings" the electrons from the bond it broke with it?  Am I thinking about the way the R group migrates incorrectly?