hydroboration reaction oxymercuration demercuration reaction preparation of alcohol from alkene

Definition of hydroboration reactionHydroboration reaction is one type of addition reaction which is used to prepare alcohol from alkene.

Important points about hydroboration reaction

1.In hydroboration reaction no true carbo cation formed.

2.There is no rearrangement takes place.

3.four member cyclic transition state formed.

4.Addition of bh3 takes place according to to marconiff rule.

 5.Here syn addition takes place.

6.Addition of of water according to 2nt Marconi rule

Oxymercuration demarcuration reaction
This reaction each also used for the preparation of alcohol from alkene.But here we get anti product and according to marconiff rule.