What do the numbers in compound names like 1,4-diaminobenzene mean?
In: Chemistry
The numbers indicate the positions of the amino groups on the arene (benzene group). The arene has the shape of a hexagon, the counting starts at the top and continues in a clockwise direction.
The compound you named is also called para-diaminobenzene, “para” meaning parallel to. In this case it means that one amino group is on the exact opposite from the other group.
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