CHEM 213 Chapter Notes - Chapter 14.8-14.11: Polycyclic Aromatic Hydrocarbon, Cyclopentene, Pyrene
20 Mar 2017
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Benzenoid aromatic compounds a broad class of aromatic compounds: polycyclic aromatic hydrocarbons (pah) Consist of molecules having two or more benzene rings fused together. Carbons which share rings = points of ring fusion: they do not carry hydrogen atoms on them. Huckel"s rule is only meant for monocyclic compounds: but if you remove internal double bonds and only count the outside, may also say something about the aromaticity of a compound. Nonbenzenoid aromatic compounds: is self explanatory, are aromatic compounds which are not in kekule/benzene structure, azulene = a 7 ring and a 5 ring fused. Fullerenes: fullerenes are cage-like structures like c60 or c70. Highly stable carbon clusters: a netwerk of pentagons and hexagons. 12 ve membered faces closes it into a sphere-like shape. Each carbon is sp2 and bound to three other carbons: the remaining electron is delocalized and make the compound aromatic in nature.
