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	Categories: Polycyclic aromatic hydrocarbons Phenanthrene Phenanthrene is a polycyclic aromatic hydrocarbon composed of three fused benzene rings--as the above formula shows. Phenanthrene has five resonance structures, given below. Reactions of phenanthrene typically occur at the 9 and 10 positions. Canonical forms of Phenanthrene $\updownarrow$ $\updownarrow$ $\updownarrow$ $\updownarrow$ Categories: Polycyclic aromatic hydrocarbons

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