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13.2 - Since the name phenylene (o-, m- or p-) is retained for the radical (exception to Rule A-11.6), bivalent radicals formed from substituted benzene derivatives and having the free valences at ring atoms are named as substituted phenylene radicals. The carbon atoms having the free valences are numbered 1,2-, 1,3- or 1,4- as appropriate.
Examples to Rule A-13.1
13.3-The following trivial names for radicals having a single free valence in the side chain are retained:
13.4 - Multivalent radicals of aromatic hydrocarbons with the free valences in the side chain are named in accordance with Rule A-4.
Examples to Rule A-13.3
13.5 - The generic names of univalent and bivalent aromatic hydrocarbon radicals are "aryl" and "arylene", respectively.
Examples to Rule A-13.4
See Recommendations'93 R-9.1, Table 19(b)
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