Lecture 4: Molecular Orbitals and Aromaticity
KEY INFORMATION SUMMARY
HERE you can find extra resources to help you with this lecture!
PROBLEMS
Problem 4.1: Benzene Properties
- Explain why we cannot use two Kekulé structures (alternating single-double C-C bonds of different lengths) to show benzene resonance. SOLUTION
- Draw the proper resonance structures for benzene. SOLUTION
If you made some mistakes or want to practice more, review the concepts that gave you trouble and work on this extra problem. If you're good, move to the problem below ;)
Problem 4.2: Aromaticity
Assign the classification of aromatic, anti-aromatic, or non-aromatic to each of the structures below using Hückel’s Rule and check your classifications using the polygon method for p-system MO. SOLUTION
If you made some mistakes or want to practice more, review the concepts that gave you trouble and work on this extra problem. If you're good, move to the problem below ;)
Problem 4.3: Polycyclics and Ring Shapes
Pentalene is unstable, even at -100°C, whereas heptalene can be made and is shown to react like a acyclic alkene. Explain the difference. SOLUTION
If you made some mistakes or want to practice more, review the concepts that gave you trouble and work on this extra problem. If you're good, move to the next lecture ;)