Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A peroxide is a compound containing an oxygen-oxygen single bond. The simplest stable peroxide is hydrogen peroxide. Superoxides, dioxygenyls, ozones and ozonides compound are considered separately. Organic peroxides are compounds with a specific functional group or a molecule containing an oxygen-oxygen single bond (R-O-O-R''). When the other oxygen bears a hydrogen, it is called a hydroperoxide (R-O-O-H). The radical HOO· is known as hydroperoxide radical, and is thought to be involved in combustion of hydrocarbons in air.