16. Conjugated Systems

Propose reasonable molecular orbitals for the following conjugated atomic orbitals.

(c) Drawpictorialrepresentations (as in Figures16-4 and 16-6) 

for the three bonding MOs and the two nonbonding MOs of cyclooctatetraene. The antibonding MOs are difficult to draw, 

except for the all-antibonding MO.

<IMAGE>

Repeat Problem 16-10 for the cyclopentadienyl ions.

Draw one all-bonding MO, then a pair of degenerate MOs,

and then a final pair of degenerate MOs.

Draw the energy diagram, fill in the electrons,

and confirm the electronic configurations of

the cyclopentadienyl cation and anion.