Classification of Heterocyclic Compounds

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.

Five membered heterocyclic compounds

Six-Membered Heterocyclic Compounds: These compounds contain six atom ring in which five atoms are carbon while one is hetero atom.

six membered heterocyclic compounds

Seven-Membered Heterocyclic Compounds: These are seven membered ring compounds consisting of one hetero atom and six carbon atom.

Seven membered heterocyclic compounds

Condensed Heterocyclic Compounds: These types of compounds, comprises of a benzene ring fused with the heterocyclic ring containing 5 or 6 atoms.

Condensed heterocyclic compounds

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Factors affecting conformational stability
Stereospecific and stereoselective reactions
Nomenclature of geometrical isomers