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:
See Recommendations'93 R-1.2.4
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