Abstract
Abstract Various polycyclic aromatic hydrocarbons (PAHs) are distributed widely in our environment. Diesel particulate extract contains many larger PAHs. All these PAHs have a percent resonance energy larger than 2.50. Dibenzo[def,mno]chrysene and anthracene constitute the most unstable PAHs among them. A couple of reaction paths to the formation of ovalene are discernible in flames by inspecting the combustion products. It seems likely that a similar type of reactions take place in the envelopes of carbon stars to give large compact PAHs and graphite.
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