Ch_322b_14.08

Ch_322b_14.08 - These compounds must be named using numbers...

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Nomenclature of Benzene Derivatives Some of these compounds have two acceptable names. A systematic naming system has benzene as the parent, and the substitutent as a prefix. Cl chloro benzene NO 2 nitro benzene For some monosubstituted benzenes, common names are widely used. CH 3 toluene OH phenol NH 2 aniline COOH benzoic acid
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Disubstituted Benzenes The positions of the substituents are indicated relative to each by either of two naming systems. The prefixes ortho ( o ), meta ( m ) and para ( p ) specifically refer to the following relative positions: Br Br ortho o -dibromobenzene Br Br meta m -dibromobenzene Br Br para p -dibromobenzene The relative positions of two substituents may also be indicated by numbers . When a common name is used for a monosubstituted benzene, that substituent is at position 1. CH 3 NO 2 4- nitrotoluene ( p- nitrotoluene) COOH NO 2 3- nitrobenzoic acid ( m- nitrobenzoic acid) Cl Cl 1,2- dichlorobenzene ( o- dichlorobenzene)
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Benzenes with Three or More Substituents
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Unformatted text preview: These compounds must be named using numbers to indicate the relative positions of the substituents around the ring. When a common name is used for a parent monosubstituted benzene, that substituent is at position 1. The o,m,p naming system is never used when there are three or more substituents. NO 2 NO 2 O 2 N 1,3,5-trinitrobenzene CH 3 Cl Cl 2,4-dichlorotoluene The Phenyl Substituent Group The C 6 H 5 group in a structure often is conveniently named as a phenyl group , a substituent group. CH 3 CHCH 2 CH 3 2-phenyl butane CH 3 CHCH=CH 2 3-phenyl-1-butene Quiz 14.07 Provide names for the following aromatic compounds using the provided information. Cl Cl Cl Cl Cl NO 2 COOH benzoic acid COOH NO 2 OH phenol OH Cl nitrobenzene ortho-dichlorobenzene 1,2,4-trichlorobenzene meta-nitrobenzoic acid para-chlorophenol...
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Ch_322b_14.08 - These compounds must be named using numbers...

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