Rule C-16.2 Order of Prefixes. General Procedure (Substitutive Nomenclature)

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Substitutive Nomenclature

General Procedure Rule C-16.2

16.21 - Prefixes for sub-substituents (that is, substituents of substituents) are arranged in order amongst themselves in the complete name of the substituted substituent in the same way as are the prefixes for substituents of a parent compound; then the complete names of the substituted substituents are treated as single (complex) prefixes to the name of the parent compound.

Examples to Rule C-16.21

(a) If isoquinoline is substituted by a chloronitrophenyl group and by a chlorofluoroethyl group, then

(i) Chloro and nitro are arranged amongst themselves and placed immediately in front of phenyl.
(ii) Cloro and fluoro are arranged amongst themselves and placed immediately in front of ethyl.
(iii) Chloronitrophenyl and chlorofluoroethyl are arranged amongst themselves in front of isoguinoline.
Together with locants, the following name is thus derived:

(b) If benzoic acid is substituted by group in the para-position, then
(i) benzoic acid is selected as the parent name,
(ii) the ethyl and methyl radicals are arranged in order immediately in front of amino, and
(iii) ethylmethylamino is then placed in front of benzoic acid.
Together with the locant, the following name is thus derived:

Next:: General Procedure
Rule C-16.3

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