How Do We Name Molecules with More Than One Substituent

How Do We Name Molecules with More Than One Substituent  

A systematic name must identify a compound unambiguously. Therefore, a special system of rales must be followed to name molecules that contain more than one substituent. 

In molecules that contain two or more identical substituents, the prefixes di, tri, tetra, penta, and so forth, are used to denote the number of substituents. Numbers are then used to denote their positions. (Note that two substituents may be bonded to the same carbon atom. In this case, the carbon s number is repeated with a comma between the numbers.) 

In the case where two or more different substituents are present, the substituent names are alphabetized in the systematic name of the componnd. Numbers are used to indicate the positions of the alphabetized substitnents. If a prefix is nsed to denote two or more identical substituents, the prefix is not used to determine the alphabetization—only the substituent name is used. 

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