Benzene is the simplest aromatic hydrocarbon. Synthesis of benzene via different methods, for example, on heating alkynes (acetylene), undergoes polymerization in the presences of catalyst (Cu) hot tub, it polymerizes to benzene.
The study of chemical reactions, including the reduction processes the occur of phenol possible of prepare benzene despite the presence of Sigma bond
PhOH + Zn (dust) -> C6H6 +ZnO
Roscoe, Henry (1891). A treatise on chemistry, Volume 3, Part 3. London: Macmillan & Co. p. 23.
cit. by http://en.wikipedia.org/wiki/Phenol
Many industrial chemists looking for inverse process - because demand on PhOH increase, but decrease on acetone. Cumene method produces both in equal quantities.
PhOH is much more valuable than C6H6.
When phenol undergoes distillation process in presence of zinc dust then benzene is formed
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