Heteroatoms

Some articles on heteroatoms, heteroatom:

Skeletal Formula - The Skeleton
... Skeletal atoms other than carbon or hydrogen are called "heteroatoms" ... with a "C"), whereas heteroatoms are always explicitly noted as such (i.e ... using "N" for nitrogen, "O" for oxygen, etc.) Heteroatoms and other groups of atoms that give rise to relatively high rates of chemical reactivity, or ...
Heterocyclic Compound - 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 ...
Heterocyclic Compound - 5-Membered Rings
... Five-membered rings with one heteroatom Heteroatom Saturated Unsaturated Nitrogen Pyrrolidine (Azolidine is not used) Pyrrole (Azole is not used) Oxygen ... Heteroatom Saturated Unsaturated (and partially unsaturated) Nitrogen/nitrogen Imidazolidine Pyrazolidine Imidazole (Imidazoline) Pyrazole (Pyrazoline ... Heteroatom Saturated Unsaturated 3 × Nitrogen Triazoles 2 × Nitrogen / 1 × oxygen Furazan Oxadiazole 2 × Nitrogen / 1 × sulfur Thiadiazole 1 × Nitrogen / 2 × sulfur Dithiazole Five-member ring ...