SIMPLE AROMATIC RINGS, also known as SIMPLE ARENES or SIMPLE AROMATICS, are aromatic organic compounds that consist only of a conjugated planar ring system. Many simple aromatic rings have trivial names. They are usually found as substructures of more complex molecules ("substituted aromatics"). Typical simple aromatic compounds are benzene , indole , and cyclotetradecaheptaene .
Simple aromatic rings can be heterocyclic if they contain non-carbon ring atoms, for example, oxygen , nitrogen , or sulfur . They can be monocyclic as in benzene, bicyclic as in naphthalene , or polycyclic as in anthracene . Simple monocyclic aromatic rings are usually five-membered rings like pyrrole or six-membered rings like pyridine . Fused aromatic rings consist of monocyclic rings that share their connecting bonds.
* 1 Heterocyclic aromatic rings * 2 Criteria for aromaticity * 3 See also * 4 References
HETEROCYCLIC AROMATIC RINGS
Table of simple aromatic rings
SIX-MEMBERED RINGS AND FUSED SIX-MEMBERED RINGS
The nitrogen (N)-containing aromatic rings can be separated into basic aromatic rings that are easily protonated , and form aromatic cations and salts (e.g., pyridinium ), and non-basic aromatic rings.
* In the BASIC AROMATIC RINGS, the lone pair of electrons is not part of the aromatic system and extends in the plane of the ring. This lone pair is responsible for the basicity of these nitrogenous bases , similar to the nitrogen atom in amines . In these compounds the nitrogen atom is not connected to a hydrogen atom. Examples of basic aromatic rings are pyridine or quinoline . Several