Hydrocarbon containing

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Hydrocarbon containing
two double bonds diene three double bonds
triene four double bonds tetraene many double
bonds polyene
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Configurational Isomers of Dienes
The Z isomer has the high-priority groups on the
same side
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Preparation of Conjugated Dienes
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Different Kinds of Dienes
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Why is conjugated diene more stable than isolated
diene?
The closer the electrons are to the nucleus, the
shorter and stronger is the bond
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Electron Delocalization
1,4-pentadiene
1,3-butadiene
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Pi Molecular Orbitals of Ethene
Antibonding MO (1 node) Bonding MO (0
nodes)
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Pi Molecular Orbitals of 1,3-Butadiene
Antibonding (3 nodes) Antibonding (2
nodes) Bonding (1 node) Bonding (0 node)
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Electron Delocalization
1,4-pentadiene
1,3-butadiene
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A cumulated diene is less stable than an isolated
diene