Aromatic compounds are a class of hydrocarbons that
possess much greater stability than their conjugated unsaturated system
suggests. The simplest example of this class of compounds, benzene, was
isolated from illuminating gas by Michael Faraday in 1825. In the years
to follow, this compound and homologues were isolated by the
distillation of resin gums from balsam trees. Because many of the resin
gums had fragrant aromas, these compounds were often called aromatic
compounds or aromatic hydrocarbons. In 1845, August Von Hofmann isolated
benzene from coal tar. This isolation method remained the chief source
of benzene until the 1950s. Today, most benzene is produced from
petroleum.
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