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Ch08 - Reactions of Alkenes Since bonds are stronger than...

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Reactions of Alkenes Since σ bonds are stronger than π bonds, double bonds tend to react to convert the double bond into σ bonds + X-Y Y X This is an addition reaction. (Other types of reaction have been substitution and elimination). Addition reactions are typically exothermic. Electrophilic Addition The π bond is localized above and below the C-C σ bond. The π electrons are relatively far away from the nuclei and are therefore loosely bound. An electrophile will attract those electrons, and can pull them away to form a new bond. This leaves one carbon with only 3 bonds and a +ve charge (carbocation). The double bond acts as a nucleophile (attacks the electrophile). In most cases, the cation produced will react with another nucleophile to produce the final overall electrophilic addition product. Ch08 Reacns of Alkenes.doc Page1
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