disubstituted benzenes
There are only three possible isomers in any disubstituted benzene due to the planar symmetry of the ring, to identify these IUPAC nomenclature preferred to use the numbers 1.2, 1.3, 1.4 The system of prefixes is aplied widespread and is used when there disubstitution:
- ortho-, or o-isomer to 1.2
- meta-, or m-isomer to 1.3
- para-, or p-isomer to 1.4
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