Heterocyclic Compounds In organic chemistry, non-carbon atoms are collectively referred to as hetero-atom, and the most common heteroatoms are nitrogen atoms, sulfur atoms and oxygen atoms. The organism containing heteroatoms on the ring is called a heterocycle compound. They are the largest of the class of organic matter.
Heterocyclic compounds are often named under common names and are less named. System naming refers to the corresponding carbon ring for the mother and named. For example, cyclopentadienes containing two unsaturated bonds are referred to as Mao, and the corresponding heterocyclic compound, such as pyrrole, can be regarded as "CH2" replaced by "NH" For the nitrogen (miscellaneous) Mao. And so on, pyridine called nitrogen (hetero) benzene, quinoline called nitrogen (hetero) naphthalene, but generally still accustomed to using the common name.