Basic Organic Nomenclature

An Introduction

Dave Woodcock,
Associate Professor Emeritus UBC (Okanagan)
©1996,2000, 2008

6. Aromatic Compounds

III Multisubstituted Benzenes

Index


If three or more substituents are present on the benzene ring, use only numbers to indicate where those substituents are:

Examples:


1,3,5-tribromobenzene


3-bromo-5-chloro-1-nitrobenzene


2-chloro-1,3-dinitrobenzene


If a common name exists for one or more of the substituents, the highest priority group common name is used as the root and that group takes position 1 on the ring and so does not need the locant.

Examples:


2,4-dinitroaniline


2,4,6-tribromobenzoic acid


3-bromo-5-chlorobenzenesulphonic acid


isopropyl 2,3-diiodobenzoate


2,4,6-trinitrotoluene
(aka TNT)


Occasionally a common name exists for a multisubstituted benzene.

Examples:


mesitylene


picric acid

Self Assignment Questions
Review Disubstituted Benzenes

Next page : Fused-ring Aromatics

Index


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