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Solutions for Reactions of Aromatic Compounds
HC CH2 HC
CH
E
H
CH2
H
E
HC
HC CH2
C
HC
E
H
CH2 HC CH2
H
E
6 For ortho and para attack, the positive charge in the sigma complex can be shared by resonance with 
the vinyl group. This cannot happen with meta attack because the positive charge is never adjacent to the 
vinyl group. (Ortho attack is shown; para attack gives an intermediate with positive charge on the same 
carbons.)
E
"extra"
resonance form
Br
OCH2CH3
OCH2CH3
CH
Br
H
Br Br FeBr3
H
Br
HC
OCH2CH3
C
OCH2CH3
Br
H H
Br
OCH2CH3
Br
OCH2CH3
7 Attack at only ortho and para positions (not meta) places the positive charge on the carbon with the 
ethoxy group, where the ethoxy group can stabilize the positive charge by resonance donation of a lone 
pair of electrons. (Ortho attack is shown; para attack gives a similar intermediate.) (Unshared electron 
pairs on halogen not shown here.)
"extra"
resonance form
NH2
CH
Br
H H
Br
HC
NH2
C
NH2
Br
H H
Br
NH2
ortho
"extra"
resonance form
8
NH2
HC
Br H
H
Br
CH
NH2
HBr
C
NH2
NH2
HC
Br
H
NH2
Br H
H
Br
C
H
NH2
NH2
CH
Br H
meta
"extra"
resonance form
para
387

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