3.3.4.2. electrophilic addition

• electrophiles 


  electron acceptors attracted to areas of high electron density
• most common electrophiles

  • HBr
  • Br2
  • H2SO4
• what can electrophiles be used to form from alkenes?

  alkyl hydrogensulphates or halogenoalkanes
• carbocations


  have varying stability - tertiary is the most stable and primary the least
• stability of carbocations


  the more stable the carbocation, the more likely it is to form
• carbocations in addition reactions


  multiple products can form but the major product will always be the most stable possible
• addition mechanism for HBr / Br2

  
• electrophilic addition mechanism with H2SO4