Table 23 Heterocyclic parent hydrides

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Table 23 Heterocyclic parent hydrides.

Type 1-Unlimited substitution

Acridarsine
(An exception to systematic numbering)

Acridine
(An exception to systematic numbering)

Arsanthridine
Arsindole
(1H-isomer shown)

Arsinoline

Carbazole (9H-isomer shown)
(An exception to systematic numbering)

-Carboline
(9H-isomer shown)

Chromene (2H-isomer shown)
(Chalcogen analogues are named using the prefixes "thio-", "seleno-" and "telluro-".)

Cinnoline
Furan

Imidazole
(1H-isomer shown)
Indazole
(1H-isomer shown)

Indole
(1H-isomer shown)
Indolizine

Isoarsindole
(2H-isomer shown)
Isoarsinoline

Isobenzofuran

Isochromene
(1H-isomer shown)
(Chalcogen analogues are named using the prefixes "thio-", "seleno-" and "telluro-").

Isoindole
(1H-isomer shown)
Isophosphindole
(2H-isomer shown)

Isophosphinoline
Isoquinoline

Isothiazole
Isoxazole

Naphthyridine
(1,8-isomer shown)

Perimidine
(1H-isomer shown)

Phenanthridine

Phenanthroline
(1,7-isomer shown)

Phenazine
Phosphindole
(1H-isomer shown)

Phosphinoline
Phthalazine

Pteridine

Purine
(7H-isomer shown)
(An exception to systematic numbering)

Pyran (2H-isomer shown)
(Chalcogen analogues are named using the prefixes "thio-", "seleno-" and "telluro-".)

Pyrazine

Pyrazole
(1H-isomer shown)
Pyridazine

Pyridine
Pyrimidine

Pyrrole
(1H-isomer shown)
Pyrrolizine
(1H-isomer shown)

Quinazoline
Quinoline

Quinolizine
(4H-isomer shown)
Quinoxaline

Selenophene
Tellurophene

Thiophene

Xanthene
(9H-isomer shown)(An exception to systematic numbering)
(Chalcogen analogues are named using the prefixes "thio-", "seleno-" and "telluro-".)

This HTML reproduction is as close as possible to the published version [see IUPAC, Commission on Nomenclature of Organic Chemistry. A Guide to IUPAC Nomenclature of Organic Compounds (Recommendations 1993), 1993, Blackwell Scientific publications, Copyright 1993 IUPAC]. If you need to cite these rules please quote this reference as their source.

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Cinnoline	Furan
Imidazole (1H-isomer shown)	Indazole (1H-isomer shown)
Indole (1H-isomer shown)	Indolizine
Isoarsindole (2H-isomer shown)	Isoarsinoline

Isoindole (1H-isomer shown)	Isophosphindole (2H-isomer shown)
Isophosphinoline	Isoquinoline
Isothiazole	Isoxazole

Phenazine	Phosphindole (1H-isomer shown)
Phosphinoline	Phthalazine

Pyrazole (1H-isomer shown)	Pyridazine
Pyridine	Pyrimidine
Pyrrole (1H-isomer shown)	Pyrrolizine (1H-isomer shown)
Quinazoline	Quinoline
Quinolizine (4H-isomer shown)	Quinoxaline
Selenophene	Tellurophene