heterocyclic compound

Introduction
General aspects of heterocyclic compounds
Comparison with carbocyclic compounds
Nomenclature of heterocyclic compounds
The nature of heteroaromaticity
Physical properties of heterocyclic compounds
- Melting and boiling points
- Ultraviolet, infrared, nuclear magnetic resonance, and mass spectra
Synthesis and modification of heterocyclic rings
- Nucleophilic ring closure
- Electrophilic ring closure
- Ring closure by way of cyclic transition states
- Conversion of one heterocyclic ring into another
- Modification of an existing ring
Major classes of heterocyclic compounds
- Three-membered rings
- Four-membered rings
- Five-membered rings with one heteroatom
- Six-membered rings with one heteroatom
- Five- and six-membered rings with two or more heteroatoms
- Rings with seven or more members
- Rings with uncommon heteroatoms
  - Halogens, selenium, and tellurium
  - Phosphorus, arsenic, antimony, and bismuth
  - Silicon, germanium, tin, and lead
  - Boron

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sulfur-containing heterocycles

Five structural diagrams of well-known alkaloids-morphine, quinine, ephedrine, strychnine, and nicotine-showing their organic nitrogen-containing base chemical structures, each labeled with its name.

heterocyclic anthraquinone dyes

At a Glance

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heterocyclic compound summary

heterocyclic compound: Media

chemistry

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sulfur-containing heterocycles

sulfur-containing heterocycles

There are many different sulfur-containing heterocycles. One of the best known is...

Encyclopædia Britannica, Inc.

Ergot

Ergot

The fungal disease of cereal grasses known as ergot is caused by the fungus Claviceps...

Walter Dawn

indigo

indigo

The heterocyclic dye known as indigo is a naturally occurring compound that can be...

A to Z Botanical Collection/Encyclopædia Britannica, Inc.

Five structural diagrams of well-known alkaloids-morphine, quinine, ephedrine, strychnine, and nicotine-showing their organic nitrogen-containing base chemical structures, each labeled with its name.

Alkaloids

Chemical structures of the well-known alkaloids morphine, quinine, nicotine, strychnine,...

Encyclopædia Britannica, Inc.

heterocyclic anthraquinone dyes

heterocyclic anthraquinone dyes

Anthrapyrimidine yellow, flavanthrone yellow, indanthrone blue-reddish, and indanthrone...

Encyclopædia Britannica, Inc.

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