17.3 : 具有多个取代基的芳香族化合物的命名

The IUPAC nomenclature of aromatic compounds with multiple substituents depends on the number and position of the substituents.

To name the disubstituted benzene derivatives, the substituent's positions are indicated either by using the prefixes ortho, meta, and para, abbreviated as o, m, and p, respectively, or using numbers like 1,2- for ortho, 1,3-  for meta, and 1,4- for para. 

If the two substituents are different, they are numbered and listed alphabetically.

When one of the substituents imparts a common name to the compound, the compound is named as a derivative of that parent molecule.

To name polysubstituted benzene derivatives with more than two substituents, numbers are used to indicate the positions of substituents.

The substituents are given the lowest possible numbers and are listed alphabetically.

If any substituent imparts a common name, it is assigned locant one, and the compound is named as the derivative of that parent molecule.