6-Membered Rings
Six-membered rings with a single heteroatom:
| Heteroatom | Saturated | Unsaturated |
|---|---|---|
| Nitrogen | Piperidine (Azinane is not used) | Pyridine (Azine is not used) |
| Oxygen | Oxane | Pyran (2H-Oxine is not used) |
| Sulfur | Thiane | Thiopyran (2H-Thiine is not used) |
| Silicon | Salinane | Siline |
| Germanium | Germinane | Germine |
| Tin | Stanninane | Stannine |
| Boron | Borinane | Borinine |
| Phosphorus | Phosphinane | Phosphinine |
| Arsenic | Arsinane | Arsinine |
With two heteroatoms:
| Heteroatom | Saturated | Unsaturated |
|---|---|---|
| Nitrogen / nitrogen | Piperazine | Diazines |
| Oxygen / nitrogen | Morpholine | Oxazine |
| Sulfur / nitrogen | Thiomorpholine | Thiazine |
| Oxygen / oxygen | Dioxane | Dioxine |
| Sulfur / sulfur | Dithiane | Dithiine |
With three heteroatoms:
| Heteroatom | Saturated | Unsaturated |
|---|---|---|
| Nitrogen | Triazine | |
| Oxygen | Trioxane |
With four heteroatoms:
| Heteroatom | Saturated | Unsaturated |
|---|---|---|
| Nitrogen | Tetrazine |
The hypothetical compound with six nitrogen heteroatoms would be hexazine.
Read more about this topic: Heterocyclic Compound
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