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Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation01:28

Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation

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Unlike the easy catalytic hydrogenation of an alkene double bond, hydrogenation of a benzene double bond under similar reaction conditions does not take place easily. For example, in the reduction of stilbene, the benzene ring remains unaffected while the alkene bond gets reduced. Hydrogenation of an alkene double bond is exothermic and a favorable process. In contrast, to hydrogenate the first unsaturated bond of benzene, an energy input is needed; that is, the process is endothermic. This is...
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Reduction of Alkenes: Catalytic Hydrogenation02:13

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Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...
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Benzene to Phenol via Cumene: Hock Process01:27

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The synthesis of phenol from benzene via cumene and cumene hydroperoxide is called the Hock process. First, a Friedel–Crafts alkylation reaction of benzene with propene gives cumene. Then cumene forms cumene hydroperoxide via a radical chain reaction. In the chain initiation step, the benzylic hydrogen is abstracted to give a benzylic radical. In the chain propagation step, the benzylic radical reacts with an oxygen diradical to form a cumene hydroperoxide radical. The cumene...
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Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

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Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
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Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation02:24

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Introduction
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
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Electrophilic 1,2- and 1,4-Addition of HX to 1,3-Butadiene01:17

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The electrophilic addition of hydrogen halides such as HBr to alkenes and nonconjugated dienes gives a single product as per Markovnikov’s rule.
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Benzene partial hydrogenation: advances and perspectives.

Lucas Foppa1, Jairton Dupont

  • 1Institute of Chemistry, UFRGS, Avenida Bento Gonalves, 9500, Porto Alegre, 91501-970 RS, Brazil. jairton.dupont@ufrgs.br.

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Summary

This review explores sustainable chemistry for benzene partial hydrogenation to cyclohexene. Ruthenium catalysis in liquid phase batch reactions is highlighted for greener industrial applications.

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Area of Science:

  • Catalysis
  • Green Chemistry
  • Organic Synthesis

Background:

  • Partial hydrogenation of benzene to cyclohexene is economically significant but technically difficult.
  • Industrial application of existing methods is limited by environmental concerns.
  • Sustainable chemistry approaches are needed for this transformation.

Purpose of the Study:

  • To review key findings in benzene partial hydrogenation from a sustainable chemistry perspective.
  • To emphasize ruthenium-catalyzed liquid phase batch hydrogenation.
  • To guide future research towards environmentally friendly processes.

Main Methods:

  • Literature review of catalytic systems for benzene hydrogenation.
  • Focus on ruthenium-based catalysts.
  • Analysis of reaction conditions and sustainability metrics.

Main Results:

  • Ruthenium catalysts show promise for selective benzene to cyclohexene conversion.
  • Liquid phase batch hydrogenation offers a viable route.
  • Understanding governing principles is crucial for process optimization.

Conclusions:

  • Ruthenium-catalyzed partial hydrogenation is a key area for sustainable benzene conversion.
  • Further research can overcome environmental limitations.
  • This review provides insights for developing greener industrial processes.