“…Resonantly stabilized free radicals such as allyl and benzyl radicals, are ubiquitous in many chemical environments and have been detected or implicated as key intermediates in flames, , plasmas, , and in interstellar space. − These transient species are known to participate in a wide variety of chemical reactions including polymerizations, − combustions, ,− organic syntheses, , and in biological and environmental processes . For example, benzyl radicals and their derivatives have shown to be essential intermediates in the oxidation of toluene and methylbenzenes, ,, and are implicated in the formation of polycyclic aromatic hydrocarbons (PAHs) in combustion reactions and in the atmospheric processes of earth and other planets. ,− Likewise, allylic radicals play specific roles in organic chemistry, including halogenation chemistry, − addition chemistry to fullerene structures, , and in polymerizations involving multiallyl monomers. , Furthermore, allyl and benzyl radicals have allowed a simple framework to comprehend the underlying physical organic concepts governing the stability and reactivity of these compounds, especially concerning the concept of resonance and aromaticity.…”