Chemistry Reference
In-Depth Information
meta
H
H
H
H
H
H
N
N
N
+
+
H
H
H
+
Br
Br
Br
Note that in
ortho
or
para
substitution the carbocation can be stabilized by
delocalization of the positive charge to the nitrogen atom. This is not possible for
meta
substitution. Therefore,
ortho
and
para
substitution are preferred.
4.15
ortho
-
O
O
H
O
O
H
+
C
C
H
H
+
+
Br
Br
O
O
H
O
O
H
C
C
H
H
Br
Br
+
+
para
-
O
O
H
O
O
H
+
C
C
+
+
H r
H r
O
O
H
O
O
H
C
C
+
+
H r
H r
