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(a) Phosphopeptides as catalysts for the BV oxidation of cyclobutanones 2.80 with aqueous H2O2. A key Dap(Ac) residue at the i+3 position facilitates noncovalent interactions with the substrate. (c) Reversal in the sense of asymmetric induction upon switching from an ortho- (2.80) to a meta-directing group (2.84).85
