This network also includes subsequent isomerization reactions, αAlkoxyIsomFromβ and αAlkoxyIsomFromγ, forming αQOOH [O]. These subsequent isomerization reactions have even higher barriers than both the direct isomerization from αRO 2 (αAlkoxyIsom) and the lowest-energy decomposition pathways (αEpoxyFromβ and αC4EtherFromγ). Due to the high barriers of these alkylbased isomerizations, they were not calculated for the βand γ-networks. The products formed from the isomerizations, αQOOHβ, αQOOHγ, and αQOOH[O], each have a number of decomposition pathways. The alkoxy pathway has three β-scission reactions that break a bond connected to the α-carbon. The αQOOHβ behaves similar to peroxy radicals from nonoxygenated fuels, with the formation of an epoxide (in this case trisub_epoxy) + OH, or an alkene (ibutenol ) + HO 2 as the main channels. The αQOOHγ decomposition can undergo reactions αDoubleβ-scission, αC4EtherFromγ, and α-βscissionFromγ. The last of these reactions has the highest barrier and forms a methyl radical and alkene. Since this reaction is unlikely to dominate at any realistic condition, reactions forming both alkenes and methyl radicals were excluded for the other peroxy networks. The other β-scission reaction involves the simultaneous breaking of two bonds, similar to the Waddington mechanism described for β-peroxy radicals, but with a higher barrier. αC4EtherFromγ has the lowest decomposition barrier for αQOOHγ, but it is still significantly higher than the decomposition reactions of αQOOHβ and αQOOH[O]. From the quantum calculations, we derived density of states and microcanonical rates, with selected microcanonical rates shown in Figure . The formation of αAdduct is the dominant pathway, as it is faster than other channels by at least an order of magnitude at all energy levels. For αAdduct, shown in Figure , most energies result in the breaking of the hydrogen bond to form HO 2 and isobutanal. Since this rate is based largely on the ILT for forming αAdduct from HO 2 and isobutanal through microcanonical equilibrium, the exact rate is highly uncertain. However, given the wide gap in Figure , one or two orders of magnitude change in the αAdductSplit rate will not shift the major product.