Reaction List - Ch 12 Reactions of Alkenes (II) A d d i t i o n o f X 2 A d d i t i o n o f X 2 w i t h H 2 O C a t a l y t i c H y d r o g e n a t i o n H y d r o x y l a t i o n H 2 Pd/C H adds to both sides of C=C excess hydrogen is always present syn addition alkane KMnO 4 H 2 O, NaOH OH OH OH is added to both sides of C=C syn addition OsO 4 H 2 O 2 or halogen is added to both sides of C=C Cl 2 or Br 2 may be used (diiodides are not very stable) anti addition Br 2 Br Br vicinal diol vicinal dihalide OH is added to more substituted side, halogen to less Cl 2 , Br 2 , or I 2 may be used anti addition Br 2 OH Br H 2 O halohydrin
