R-0.2.1 Parent structures

R- Parent hydride: an unbranched acyclic or cyclic structure or an acyclic/cyclic structure having a semisystematic or trivial name to which only hydrogen atoms are attached.

Examples to R-

Methane (R-2.1)

Cyclohexane (R-

Styrene (R-9.1, Table 19(a))

Pyridine R-9.1, Table 23)

R- Functional parent: a structure the name of which implies the presence of one or more characteristic groups and which has one or more hydrogen atoms attached to at least one of its skeletal atoms or one of its characteristic groups, or in which at least one of its characteristic groups can form at least one kind of functional modification.

Examples to R-

Acetic acid (R-9.1, Table 28(a))

Aniline (R-9.1, Table 29(a))

Phosphonic acid (R-3.3)

Note: A parent hydride bearing a characteristic group denoted by a suffix, for example, cyclohexanol, is not considered to be a functional parent, but may be described as a "functionalized parent hydride".

R-0.2.2 Groups
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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