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1 Parent Structures
For a couple of partially saturated fused hydrocarbons the following long
established trivial names are retained:
Indane
(2,3-DihydroIH-indene)
Aceanthrene
Acenaphthene
(1,2-Dihydroacenaphthylene)
Acephenanthrene
( 4,5-Dihydroacephenanthrylene)
(1,2-Dihydroaceanthrylene)
Cholanthrene
The names of substituent groups derived from fused hydrocarbons are
obtained, as repeatedly described, by attaching the syllables
yl
ylidene
diyl
for monovalent groups
if two free valences are at the same C atom
if two free valences occur at different C atoms (formerly: ylene)
More than two free valences are indicated by ... triyl, ... tetrayl, etc. If, as in
Chern. Abstr. practice, unabbreviated systematic group terms are used
instead of the traditional short forms 2-naphthyl, 9-anthryl, 4-phenanthryl, etc. the corresponding locants are inserted in front of the functionalities: naphthalen-2-yl, phenanthren-4-yl, etc. Within the frame of hydrocarbon numbering, free valences are given the lowest locants possible.
Fluoren-3-ylidene
Biphenylene-l,8-diyl
(1,8-Biphenylenylene)
Triphenylene1,4,5,8,9,12-hexayl