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Parent Hydrides

R-2.3.1 Hydrocarbons

R-2.3.1.1 The names of saturated monocyclic hydrocarbons are formed by attaching the prefix "cyclo-" to the name of the acyclic saturated unbranched hydrocarbon with same number of carbon atoms. The generic name of monocyclic hydrocarbons is "cycloalkane". Numbering proceeds sequentially round the ring.

Examples to R-2.3.1.1

R-2.3.1.2 Unsubstituted monocyclic hydrocarbon polyenes having the maximum number of noncumulative double bonds and with a general formula of CnHn or CnH2n+1 (with n greater than 6) are called annulenes generically. A specific annulene may be named as an [n]annulene, where n is the number of carbon atoms of the ring. When n is an odd number, i.e., when the annulene has the general formula CnHn+1 the extra hydrogen atom is denoted as "indicated hydrogen" (see R-1.3).

Examples to R-2.3.1.2

(Cyclodecapentaene according to R-3.1.1)

(Cyclonona-1,3,5,7-tetraene according to R-3.1.1)

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R-2.3.2 Homogeneous hydrides other than hydrocarbons or boron hydrides
R-2.3.3 Heterogeneous hydrides other than heteropolyboron hydrides
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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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