Mechanism of Radical Bromination of Alkanes Page # 1
Step 1: Initiation:
or
Br Br
hν
iii iii
homolytic (or) heat
cleavage
radical
consumed
Propagation H H
H H NNN I 1
Br H C c H BI
H C C H I 1
Step-2 H H
H H
i.ardaianaiaegnas.in
nr raareaeaierae
Regioselectivity:
Br 2
EE Br Br Step-3
hν H H
BI t H tI d1 BI
H H
A coupling
haloalkane
Br Br
Termination
coupling H H F annihilation
Br + NABr I I g of
H C C Br radicals
Product
1 I k
Step-4 L
H H H H
H H H H
coupling p I l
H C C + Br
N f H c c c c H
Step-5
H H l I I 1
H H H H
H
ND Y fc
H H H H H
H C C
+
C C H H E c c H
Step-6
H H H H
H H H H
H H H H
H C C + H C C
Step-7
H H H H
Step 1: Initiation:
or
Br Br
hν
iii iii
homolytic (or) heat
cleavage
radical
consumed
Propagation H H
H H NNN I 1
Br H C c H BI
H C C H I 1
Step-2 H H
H H
i.ardaianaiaegnas.in
nr raareaeaierae
Regioselectivity:
Br 2
EE Br Br Step-3
hν H H
BI t H tI d1 BI
H H
A coupling
haloalkane
Br Br
Termination
coupling H H F annihilation
Br + NABr I I g of
H C C Br radicals
Product
1 I k
Step-4 L
H H H H
H H H H
coupling p I l
H C C + Br
N f H c c c c H
Step-5
H H l I I 1
H H H H
H
ND Y fc
H H H H H
H C C
+
C C H H E c c H
Step-6
H H H H
H H H H
H H H H
H C C + H C C
Step-7
H H H H