Test 3 Postponed until May 3

�1

Aromaticity: A special case of resonance Section 8.16 & 8.17

�2

Br2

Br2

Aromaticity: A special case of resonance Section 8.16 & 8.17

�3

H2

Pt cat.

2 H2

Pt cat.

2 H2

Pt cat.

3 H2

Pt cat.

ΔHreaction (kcal/mol)per bond (kcal/mol)

cyclohexene –28.6 –28.6

1,4 cyclohexadiene –57.4 –28.7

1,3-cyclohexadiene –55.4 –27.7

benzene –79.8

Aromaticity: the rules for aromaticity Section 8.16 & 8.17

�4

Aromatic? Section 8.16, 8.17, 8.18 8.20

�5

N O

HN

O

O

Antiaromaticity: A case for avoiding resonance Section 8.19

�6