Name Interpretation

R-6.2 2,3-Dichloro-6-[4-chloro-2-(hydroxymethyl)-5-oxohex-3-en-1-yl]pyridine-4-carboxylic acid

(a) The suffix carboxylic acid together with its locant, '4', describes the presence of a carboxy group, , at position 4 of the parent hydride 'pyridine' giving the structure and numbering shown below:


(b) The prefixes 'chloro-' and ' [4-chloro-2-(hydroxymethyl)-5-oxohex-3-en-1-yl] ', together with the numerical prefix 'di-' and the locants '2,3', and '6', respectively, indicate the presence of chlorine atoms at positions 2 and 3 and a complex substituent 'R' at position 6; the resulting partial structure is as follows:


(c) The complex substituent 'R' is analysed in the same way as in (a) and (b), except that the point of attachment (free valence) takes the place of the principal characteristic group. Hence, in the substituent name 4-chloro-2-(hydroxymethyl)-5-oxohex-3-en-1-yl:

(1) the suffix '-yl', together with its locant '1', specifies the attachment of a six-carbon chain, hex, to the parent structure (II); and the subtractive infix 'en', together with its locant, '3', indicates the presence of a double bond between chain atoms 3 and 4, giving the following structure:


(2) the prefixes 'chloro-', 'hydroxymethyl-', and 'oxo-' together with their respective locants '4', '2', and '5', indicate the presence of a chlorine atom, a hydroxymethyl group, and a doubly-bonded oxygen atom substituting hydrogen atoms at these positions of the parent substituent, giving the structure shown as (IV):


(d) Attaching 'R', shown in structure (IV), to structure (II) gives the complete structure of the compound, as follows:

R-6.3 3-(2,3-Dihydroxypropyl)--methylquinoline-2-pentanoic acid
R-6.4 4,4'-Dinitro-2,3'-[ethylenebis(sulfanediyl)]dicyclo-hexane-1-carbaldehyde
R-6.5 1-Methylbutyl 4-(2-acetyl-2-ethylhydrazino)benzoate

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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