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Fused Polycyclic Hydrocarbons

Rule A-24. Radical Names from Trivial and Semi-trivial Names

24.1 - For radicals derived from polycyclic hydrocarbons, the numbering of the hydrocarbon is retained. The point or points of attachment are given numbers as low as is consistent with the fixed numbering of the hydrocarbon.

24.2 - Univalent radicals derived from "ortho-fused" or "ortho- and peri-fused" polycyclic hydrocarbons with names ending in "-ene" by removal of a hydrogen atom from an aromatic or alicyclic ring are named in principle by changing the ending "-ene" of the names of the hydrocarbons to "-enyl".

Examples to Rule A-24.2

Exceptions:


5,6,7,8-Tetrahydro-2-naphthyl
24.3 - Bivalent radicals derived from univalent polycyclic hydrocarbon radicals whose names end in "-yl" by removal of one hydrogen atom from the carbon atom with the free valence are named by adding "-idene" to the name of the corresponding univalent radical.

Examples to Rule A-24.3

1(4H)-Naphthylidene

(for 4H see Rule A-21.6)

or 1,4-Dihydro-1-naphthylidene

24.4 - Bivalent radicals derived from "ortho-fused" or "ortho- and peri-fused" polycyclic hydrocarbons by removal of a hydrogen atom from each of two different carbon atoms of the ring are named by changing the ending "yl" of the univalent radical name to "-ylene" or by adding "-diyl" to the name of the ring system Multivalent radicals, similarly derived, are named by adding "-triyl", "-tetrayl", etc., to the name of the ring system.

Examples to Rule A-24.4

See Recommendations'93 R-9.1, Table 22

Next:
Radical Names for Fused Cyclic Systems with Side Chains

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This HTML reproduction of Sections A, B and C of IUPAC "Blue Book" is as close as possible to the published version [see Nomenclature of Organic Chemistry, Sections A, B, C, D, E, F, and H, Pergamon Press, Oxford, 1979. Copyright 1979 IUPAC.] If you need to cite these rules please quote this reference as their source.

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