7-Membered Rings
With 7-membered rings, the heteroatom must be able to provide an empty pi orbital (e.g., boron) for "normal" aromatic stabilization to be available; otherwise, homoaromaticity may be possible. Compounds with one heteroatom include:
Heteroatom | Saturated | Unsaturated |
---|---|---|
Nitrogen | Azepane | Azepine |
Oxygen | Oxepane | Oxepine |
Sulfur | Thiepane | Thiepine |
Those with two heteroatoms include:
Heteroatom | Saturated | Unsaturated |
---|---|---|
Nitrogen | Homopiperazine | Diazepine |
Nitrogen/sulfur | Thiazepine |
Read more about this topic: Heterocyclic Compound
Famous quotes containing the word rings:
“The next time the novelist rings the bell I will not stir though the meeting-house burn down.”
—Henry David Thoreau (18171862)