Alkenes and electrophiles

OCR F332

Alkenes can react with a number of electrophiles. You must know the reaction conditions for the following reactions (with ethene).

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Bromine and ethene

Electrophile:

  • Br2

Product:

  • 1,2-dibromoethane
  • CH2BrCH2Br

Conditions:

  • Room temperature and pressure
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Aqueous bromine and ethene

Electrophile:

  • Br2 (aq)

Product:

  • 2-bromoethanol
  • CH2BrCH2OH

Conditions:

  • Room temperature and pressure
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Hydrogen bromide and ethene

Electrophile:

  • HBr (aq)

Product:

  • bromoethane
  • CH3CH2Br

Conditions:

  • Aqueous solution
  • Room temperature and pressure
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Water and ethene

Electrophile:

  • H2O
  • (H‒OH)

Product:

  • CH3CH2OH
  • ethanol

Conditions:

  • Phosphoric acid/silica
  • 300°C
  • 60atm

or

  • With concentrated H2SO4, then H2O at 1atm
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Hydrogen and ethene

Electrophile:

  • H2

Product:

  • ethane
  • CH3CH3

Conditions:

  • Pt catalyst
  • Room temperature and pressure

or

  • Ni catalyst
  • 150°C
  • 5atm
5 of 5

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Megan

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