As a student of
chemistry, you'll learn many reaction mechanisms. Molecules follow different
patterns of graded reactivity depending on the type of reaction can take place.
Halogenation olefin is a reaction in which a carbon double bond attacks a
neutral molecule halogen and wind up form a vicinal dihalides. The two halogen
atoms adds faces opposite the pi-bond, this is the reason why this reaction is
considered an anti addition.
The response
begins when the nucleophile pi bond for a molecule of bromine. Halogens are
very more electronegative and dislike attacked. If the atom Bromine is
attacked, it is taking revenge or attack immediately with one of the 3 pairs of
electrons.
This translates
the bromine, bound to two carbon atoms, Atom very atoms that a pi between them
link. The second molecule of bromine grabs electrons that used to bind the
bromine atoms and breaks away in solution in the form of a negative
Nucleophilic halide.
The crucial intermediary
The halogen Atom
who was attacked and attacked, is now linked to two carbon atoms form a ring
3-atom. This is called a bromonium because Bromine has a positive charge.
If this reaction
took place with the bridge chlorine resulting would be called a Chloronium
bridge.
To compensate for
these costs, bromine pulling electrons by carbon. The attached carbon atoms are
therefore partly positive and subtracts the second negative Bromine solution.
Bromine solution
approaches the molecule with the intended attack on one of two partially
positive carbon atoms. The bromonium-bridge is perched on the molecule, with
its carbon bonds are preventing the advance of a nucleophile in solution.
This requires
offensive bromide ion to attack the face opposite of the molecule, away from
the bridge and the associated steric hindrance bromonium.