Electrophilic Addition of Bromine to

Views:
 
Category: Education
     
 

Presentation Description

No description available.

Comments

Presentation Transcript

Electrophilic Addition of Bromine to Ethene : 

Electrophilic Addition of Bromine to Ethene

Step 1: Polarization of Br2 by C=C : 

Step 1: Polarization of Br2 by C=C As the bromine approaches the ethene molecule, its electron density is repelled away from the C=C, setting up a temporary dipole.

Step 2: Electrophilic attack by C=C : 

Step 2: Electrophilic attack by C=C The ? bond of the C=C bond breaks and the ? electrons form a bond with the ?+ bromine atom.

Step 3: Addition of Br- ion to intermediate : 

Step 3: Addition of Br- ion to intermediate The bromide ion is attracted to the positively charged bromonium ion. A

Step 4: Addition of Br- ion to intermediate : 

Step 4: Addition of Br- ion to intermediate The bromide ion forms a C–Br bond. It is evident that UV light is not essential to initiate the reaction. The reaction is initiated by a electrophilic attack by bromine.

authorStream Live Help