Polyoxides

Trioxidane (systematically named dihydrogen trioxide,), also called hydrogen trioxide is an inorganic compound with the chemical formula or (can be also written as or ). It is one of the unstable hydrogen polyoxides. In aqueous solutions, trioxidane decomposes to form water and singlet oxygen:

thumb|upright=0.5|right|General chemical structure of molozonides A molozonide (short for "molecular ozonide"; 1,2,3-trioxolane) is a cyclic molecule containing a five-membered ring consisting of two adjacent carbon atoms and three adjacent oxygen atoms. They are thus cyclic disubstituted trioxidane derivatives. Molozonides are formed by cycloaddition of ozone and an alkene during ozonolysis, as a transient intermediate which quickly rearranges to give the ozonide (1,2,4-trioxolane), the relatively stable product generated immediately prior to reductive or oxidative cleavage to form alcohols,

Pentaoxidane is an inorganic compound of hydrogen and oxygen with the chemical formula . This is one of the most unstable hydrogen polyoxides.