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Classify dienes as electron poor or electron rich, relative to 1,3-butadiene
Accepted Answer
Dienes can be classified as electron-rich or electron-poor relative to 1,3-butadiene based on the substituents attached to the diene system.
Electron-rich dienes have electron-donating groups attached, such as alkyl groups or alkoxy groups. These groups increase the electron density of the diene system, making it more nucleophilic.
Electron-poor dienes have electron-withdrawing groups attached, such as carbonyl groups, cyano groups, or nitro groups. These groups decrease the electron density of the diene system, making it less nucleophilic.
For example, 1,3-butadiene itself is considered a moderately electron-rich diene. A diene with two alkyl groups attached would be more electron-rich, while a diene with a carbonyl group attached would be more electron-poor.
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