The conjunctive nomenclature described in this Subsection is used especially in Chemical Abstracts, where it was formerly termed "additive nomenclature". It is particularly useful in inverted indexes.

Conjunctive nomenclature may be applied when a principal group is attached to an acyclic component that is directly attached by a carbon-carbon bond to a cyclic component. The name of the cyclic component is attached directly in front of that of the acyclic component, each name being that of the component as a molecule, that is as if the other component were replaced by hydrogen. This juxtaposition implies that hydrogen has been eliminated from each component by a process of mutual substitution, as in coroneneacetic acid (which would be named coronenylacetic acid by substitutive nomenclature). For exceptional treatment of names of parent compounds requiring indicated hydrogen see Rule C-56.1.

Conjunctive nomenclature may be used when the acyclic component is an amine named by Rule C-812.1(a), for example ethylamine, and when the acyclic component is a monocarboxylic acid having a trivial name; it is, however, not used when an unsaturated side chain is named systematically, owing to difficulty in specifying the site of unsaturation.

The precise procedures are governed by the following rules:
Rule C-51
Rule C-52
Rule C-53
Rule C-54
Rule C-55
Rule C-56
Rule C-57
Rule C-58

See Recommendations'93 R-1.2.4

This HTML reproduction of Sections A, B and C of IUPAC "Blue Book" is as close as possible to the published version [see Nomenclature of Organic Chemistry, Sections A, B, C, D, E, F, and H, Pergamon Press, Oxford, 1979. Copyright 1979 IUPAC.] If you need to cite these rules please quote this reference as their source.

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