Peroxy Acids
Examples: meta-Chloroperbenzoic acid, Peracetic Acid, Trifluoroacetic peracid
Sodium percarbonate allows the convenient preparation of peroxy acids from acid chlorides, and even from the acids themselves.
Recent Literature

The oxidation of malononitrile derivatives with peracid in methanol proceeds
with loss of the cyano groups to yield methyl esters in high yield. The method
was applied to a variety of malononitrile derivatives, some of which were
prepared by Pd- or Ir-catalyzed asymmetric allylic substitution.
S. Förster, O. Tverskoy, G. Helmchen, Synlett, 2008,
2803-2806.
