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R-0.2.2 Groups

R- Substituent atom or group: (formerly "radical"): an atom or group that replaces one or more hydrogen atoms attached to a parent structure or characteristic group except for hydrogen atoms attached to a chalcogen atom.

R- Characteristic group: a single heteroatoms, for example, and ; a heteroatom bearing one or more hydrogen atoms or other heteroatoms, for example, , , , , and ; or a heteroatomic group attached to or containing a single carbon atom, for example, , , , and , attached to a parent hydride. The most common of these groups are listed in Table 5 and Table 9.

R- Principal group: the characteristic group chosen for citation at the end of a name by a suffix or a class name.

R-0.2.3 Names
R-0.2.4 Other terms used in these recommendations

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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