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.
Similarly, the conversion of a double into a triple bond can be indicated by "didehydro-".
Examples to R-3.1.3
(see also 7,8-Didehydro-,-carotene under R-22.214.171.124).
Example to R-3.1.3
R-3.1.4 Substituent prefix names for unsaturated/saturated parent hydrides
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