Halohydrin Formation: Anti Addition via a Halonium Ion
Learn halohydrin formation from alkenes: halonium ion, anti addition, and why OH ends up on the more substituted carbon. Includes common distractors and practice.
Overall transformation: Alkene → halohydrin (X and OH added)
Reagents: X2 (Br2 or Cl2) in H2O (or NBS/H2O)
Key intermediate: Halonium ion (bridged)
Regiochemistry: OH goes to more substituted carbon
Stereochemistry: Anti addition (opening opposite the halogen bridge)