On the basis of size of heterocyclic rings, classification of these compounds is done into following types:
Five-Membered Heterocyclic Compounds: These are five membered ring compounds consisting of one hetero atom and four carbon atom.
Six-Membered Heterocyclic Compounds: These compounds contain six atom ring in which five atoms are carbon while one is hetero atom.
Seven-Membered Heterocyclic Compounds: These are seven membered ring compounds consisting of one hetero atom and six carbon atom.
Condensed Heterocyclic Compounds: These types of compounds, comprises of a benzene ring fused with the heterocyclic ring containing 5 or 6 atoms.
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| Factors affecting conformational stability |
| Stereospecific and stereoselective reactions |
| Nomenclature of geometrical isomers |
