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Characteristic (Functional) Groups

R-3.1.3 Dehydro prefixes

The presence of a double bond not implied in the parent hydride name can be indicated by a "didehydro-" prefix signifying the removal of a pair of hydrogen atoms.

Examples to R-3.1.3

Similarly, the conversion of a double into a triple bond can be indicated by "didehydro-".

Example to R-3.1.3

(see also 7,8-Didehydro-,-carotene under R-1.2.5.1).

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R-3.1.4 Substituent prefix names for unsaturated/saturated parent 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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