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The Info List - Simple Aromatic Ring


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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.

CONTENTS

* 1 Heterocyclic aromatic rings * 2 Criteria for aromaticity * 3 See also * 4 References

HETEROCYCLIC AROMATIC RINGS

Table of simple aromatic rings

Furan
Furan
Benzofuran
Benzofuran
Isobenzofuran
Isobenzofuran

Pyrrole
Pyrrole
Indole
Indole
Isoindole

Thiophene
Thiophene
Benzothiophene Benzothiophene

Imidazole Benzimidazole
Benzimidazole
Purine
Purine

Pyrazole
Pyrazole
Indazole
Indazole

Oxazole Benzoxazole

Isoxazole Benzisoxazole

Thiazole Benzothiazole
Benzothiazole

SIX-MEMBERED RINGS AND FUSED SIX-MEMBERED RINGS

Benzene
Benzene
Naphthalene
Naphthalene
Anthracene
Anthracene

Pyridine
Pyridine
Quinoline
Quinoline
Isoquinoline

Pyrazine
Pyrazine
Quinoxaline Acridine

Pyrimidine Quinazoline
Quinazoline

Pyridazine Cinnoline Phthalazine

1,2,3-Triazine 1,2,4-Triazine 1,3,5-Triazine (s-triazine)

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