The peroxy radicals (ṘO2) can further react with the fuel through H-atom abstraction, ṘO2+C3H6 ⇌ RO2H+Ċ3H5, to produce hydroperoxides which thermally decompose to form RȮ + ȮH resulting in chain branching. As the temperature is raised, the equilibrium of the Ṙ + O2 (+...