The other isomerization reactions are less important. Despite only slightly higher product energies, the decomposition pathways of γQOOHγ and γQOOH[O] all have high barriers, making them unlikely to be important at many conditions. The isomerization reaction with the highest barrier, γ-βQOOHIsom, forms γQOOHβ. This intermediate has two lower-energy decomposition paths forming either an alkene or a cyclic ether. The direct HO 2 elimination pathway from γRO 2 has a similar barrier to γ-βQOOHIsom.