R-4.2.9

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Examples to R-4.2.9

In this example, the replacement operation (see R-1.2.2) must be applied. However, for heterocyclic compounds, the replacement operation is applied to the parent name of the cyclic hydrocarbon before consideration of indicated hydrogen or the principal characteristic group. Accordingly, the heteroatoms are preferred to indicated hydrogen and to the principal characteristic group for low locants.

Principal group: -carboxylic acid

Parent hydrocarbon: Phenalene(9bH-form shown)

Replacement "a" prefix: aza-

Parent heterocycle: 1,9b-Diazaphenalene

Compound name: 1,9b-Diazaphenalene-4-carboxylic acid

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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In this example, the replacement operation (see R-1.2.2) must be applied. However, for heterocyclic compounds, the replacement operation is applied to the parent name of the cyclic hydrocarbon before consideration of indicated hydrogen or the principal characteristic group. Accordingly, the heteroatoms are preferred to indicated hydrogen and to the principal characteristic group for low locants.
Principal group:		-carboxylic acid
Parent hydrocarbon:		Phenalene(9bH-form shown)
Replacement "a" prefix:		aza-
Parent heterocycle:		1,9b-Diazaphenalene
Compound name:	1,9b-Diazaphenalene-4-carboxylic acid