These suffixes are used according to two methods as follows:
(a) The suffixes "-yl", "-ylidene", and "-ylidyne" replace the ending "-ane" of the parent hydride name. The atom with the free valence terminates the chain and always has the locant "1", which is omitted from the name. This method is recommended only for saturated acyclic and monocyclic hydrocarbon substituent groups and for the mononuclear parent hydrides of silicon, germanium, tin, lead, and boron.
(b) More general method. Any of these suffixes may be added to the name of the parent hydride with elision of a terminal "e", if present, before suffixes beginning with "y". The atoms with free valences are given numbers as low as is consistent with any established numbering of the parent hydride; except for the suffix "-ylidyne", the locant number "1" must always be cited.
The contracted names adamantyl, naphthyl, anthryl, phenanthryl (R-9.1, Table 22) and furyl, pyridyl, isoquinolyl, quinolyl, piperidyl (R-9.1, Table 25) are retained. The trivial names vinyl, allyl, and phenyl (R-9.1, Table 19(b)) and thienyl, furfuryl, and thenyl (see R-9.1, Table 25) are retained for use with no limitation on substitution; other trivial names are retained but only with limited or no substitution (see R-9.1, Table 19(b)).
Examples to R-2.5
Isopropylidene (when unsubstituted)
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