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Table 6 Affixes for ionic and radical centres in parent structures

Operation Suffix Substituent
prefix ending		 Replacement
prefix ending
Radicals (see R-5.8.1) Loss of -yl --- ---
Cations (see R-5.8.2) Loss of -ylium -yliumyl -ylia
Addition of -ium -io ---
-iumyl
-onium -onio -onia
Anions (see R-5.8.3) Loss of -ide
-ite		 -idyl
---		 -ida
-ate -ato ---
Addition of -uide -uidyl -uida

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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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