Relative Stabilities of Alkenes-Heats of Hydrogenation

• Heats of Hydrogenation

  • Alkene + H2 ----> Alkane + energy
  • Heat of Hydrogenation-Energy released upon Hydrogenation
  • Greater the Heat of Hydrogenation the less stable the orginal Alkene

• Realtive Stabilities of Butenes

  • Relative stability: trans 2-Butene > Cis-2-Butene > 1-Butene (See Fig 7.3 p 292)

• Problems 7.7 , 7.8, 7.9

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