Characteristic (Functional) Groups
R-3.1.4 Substituent prefix names for unsaturated/saturated parent hydrides When derived according to R-3.1.1, R-3.1.2 and R-3.1.3 above, these are formed by replacing the final "e" of the name of the unsaturated/saturated
structure by an appropriate suffix given in R-2.5.
Free valence position are preferred to positions of unsaturation denoted by the suffixes "-ene", etc., for low locant numbers. As with substituent prefixes
derived from saturated parent hydrides (see R-2.1), the free valences can be at any position on the parent structure. Accordingly, for acyclic unsaturated parent structures, all locants for
the free valences, including "1", must be cited.
Examples to R-3.1.4
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