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Addition Product

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Organic Chemistry

Definition

An addition product is a compound formed through the addition of two or more reactants, typically across a carbon-carbon double bond, resulting in the saturation of the double bond and the formation of a new single bond.

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5 Must Know Facts For Your Next Test

  1. In the context of electrophilic aromatic substitution reactions, the addition product is the intermediate compound formed when the electrophile (such as bromine) adds to the aromatic ring, creating a new carbon-carbon single bond.
  2. The addition product is a key step in the bromination of aromatic compounds, as it represents the stage where bromine is added to the ring before the final substitution step occurs.
  3. The formation of the addition product temporarily disrupts the aromatic stability of the ring, making the compound more reactive and susceptible to further substitution reactions.
  4. The addition product is typically a cyclohexadienyl cation, which is a resonance-stabilized carbocation intermediate that can then undergo deprotonation to form the final substituted aromatic product.
  5. Understanding the structure and reactivity of the addition product is crucial for predicting the regiochemistry and selectivity of electrophilic aromatic substitution reactions, such as the bromination of benzene or other aromatic compounds.

Review Questions

  • Explain the role of the addition product in the mechanism of electrophilic aromatic substitution reactions.
    • The addition product is a key intermediate in the mechanism of electrophilic aromatic substitution reactions. It is formed when the electrophile, such as bromine, adds to the aromatic ring, temporarily disrupting the aromatic stability and creating a cyclohexadienyl cation. This addition product is more reactive and susceptible to further substitution, leading to the final substituted aromatic product. Understanding the structure and reactivity of the addition product is crucial for predicting the regiochemistry and selectivity of these important organic reactions.
  • Describe the relationship between the addition product and the bromination of aromatic compounds.
    • In the specific context of the bromination of aromatic compounds, the addition product is a crucial intermediate. The bromination reaction proceeds through an electrophilic aromatic substitution mechanism, where bromine acts as the electrophile and replaces a hydrogen atom on the aromatic ring. The formation of the addition product, a cyclohexadienyl cation, is a key step in this process. This addition product is then further transformed, typically through deprotonation, to yield the final substituted aromatic product. Understanding the structure and reactivity of the addition product is essential for predicting the regiochemistry and selectivity of the bromination reaction.
  • Analyze how the properties of the addition product influence the outcome of electrophilic aromatic substitution reactions.
    • The properties of the addition product, such as its stability and reactivity, have a significant impact on the outcome of electrophilic aromatic substitution reactions. The addition product, which is a cyclohexadienyl cation, is a resonance-stabilized intermediate that is more reactive than the original aromatic compound. This increased reactivity makes the addition product susceptible to further substitution or transformation reactions. The specific properties of the addition product, including its electronic structure and the distribution of charge, can influence the regiochemistry and selectivity of the overall substitution reaction. By understanding the factors that govern the formation and reactivity of the addition product, organic chemists can better predict and control the outcomes of these important transformations.

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