Name Interpretation

R-6.5 1-Methylbutyl 4-(2-acetyl-2-ethyl-

This example illustrates a functional class name, and is composed of two separate words describing an ester derived from an acyclic alcohol, , and an arenecarboxylic acid, .

(a) The acyclic alcohol from which this ester is derived is described by the first word '1-methylbutyl'. The prefix 'butyl' indicates a four-carbon chain derived from the parent hydride 'butane'. The prefix 'methyl-' with its locant '1' indicates that a methyl group is at position '1' of the butyl group which, by definition, also bears the free valence, resulting in the following structure and numbering for the alcoholic component.

(b) The acid from which this ester is derived is described by the second word. The term 'benzoate' is derived from the functional parent compound benzoic acid (I). The suffix '-oate' can describe either an ester or an anion; here, it describes an ester.


(1) The prefix '(2-acetyl-2-ethylhydrazino)-' together with the locant '4' indicates the presence of a substituent at position 4 of benzoic acid. The prefixes 'acetyl' and 'ethyl' at position 2 on the parent substituent 'hydrazino', derived from the parent hydride hydrazine. By definition, the free valence for the hydrazino substituent must have the locant '1'; thus, the structure and numbering of the substituent of the acid component is shown as (II). The structure and numbering for the acid component of this ester are given as (III).

(c) The structure of the complete ester is therefore:

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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