Fenton reaction

Fe2+ + H2O2-->Fe3+ + OH· + OH. This is the iron-@S05447@-dependent @D01547@ of dihydrogen peroxide, generating the highly reactive hydroxyl radical, possibly via an oxoiron(IV) intermediate. Addition of a reducing agent, such as ascorbate, leads to a cycle which increases the damage to biological molecules.
See also:
Haber–Weiss reaction
PAC, 1997, 69, 1251. (Glossary of terms used in bioinorganic chemistry (IUPAC Recommendations 1997)) on page 1274 [Terms] [Paper]