text: Fenton's reagent is used as a sewage treatment agent.
  Fenton's reagent can be used in different chemical procesess that supply hydroxyl ion or oxidize certain compounds:
  * The first stage of Fenton’s reaction (oxidation of Fe with hydrogen peroxide) is used in Haber–Weiss reaction
  * Fenton's reagent can be used in organic synthesis reactions: e.g. hydroxylation of arenes via a free radical substitution
  * Conversion of benzene into phenol by using Fenton's reagent
  * Oxidation of barbituric acid into alloxan.
  * Coupling reactions of alkanes