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Appendix

R-9.2.1 Simple bivalent bridges

R-9.2.1.1 An acyclic bridge is named as a prefix derived from the hydrocarbon name by changing the final "e" to "o". The locant of a double bond, is present, is indicated in square brackets between the hydrocarbon prefix and the ending "-eno", "-dieno", etc.

Examples to R-9.2.1.1

Methano
Ethano
Propano
Butano
Etheno
Prop[1]eno
But[1]eno
But[2]eno
But[1,3]dieno
R-9.2.1.2 A monocyclic hydrocarbon bridgeother than benzene is named by the same prefix as used as a fusion prefix (see R-2.4.1) preceded by "epi-". The bridge is assumed to have the maximum number of noncumulative double bonds consistent with the attachment to the fused ring and/or to other bridges. The positions of the free valences are indicated by the relevant locants in square brackets directly in front of the bridge name.

Examples to R-9.2.1.2

R-9.2.1.3 Other cyclic hydrocarbon bridgeare named by prefixes derived from the unsaturated hydrocarbon name (see Table 20). Locants enclosed in square brackets are used as needed.

Examples to R-9.2.1.3

R-9.2.1.4 An acyclic heteroatomic bridgeis named by the appropriate prefix.

Examples to R-9.2.1.4

Epoxy
Epithio
Episeleno
Epidioxy
Epidithio
Epoxythio
Epoxythioxy
Epoxyimino
Epimino
Diazano
Diazeno
Triaz[1]eno
Phosphano
Stannano
Epoxymethano
Epoxyethano
Epoxyprop[1]eno
R-9.2.1.5 Heterocyclic bridgesare named by prefixes derived from the corresponding heterocyclic compound name (see Table 23). Locants enclosed in square brackets are used where necessary.

Examples to R-9.2.1.5

[3,4]Furano

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R-9.2.2 Simple polyvalent bridges
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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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