Alkenes and Alkynes - URI Department of Chemistry
Alkenes and Alkynes - URI Department of Chemistry
Alkenes and Alkynes - URI Department of Chemistry
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10/29/2010Stability <strong>of</strong> <strong>Alkenes</strong>Energy Diagram for Hydrogenation <strong>of</strong> cis- <strong>and</strong> trans- But-2-ene• Cis isomer is higher energy than the trans isomer• More energy released in the hydrogenation <strong>of</strong> the cis isomer than thetrans isomerStability <strong>of</strong> <strong>Alkenes</strong>• Energy Diagram for Hydrogenation <strong>of</strong> cis- <strong>and</strong> trans- But-2-ene• Cis isomer is higher energy than the trans isomer• More energy released in the hydrogenation <strong>of</strong> the cis isomer thanthe trans isomerStability <strong>of</strong> <strong>Alkenes</strong>Compare heats <strong>of</strong> hydrogenation ( H° hydrog ) for cis <strong>and</strong>trans isomers• Trans isomer is more stable than cis isomer by 4kJ/mol2
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