Chapter 21-2

Chapter 21-2 - 11 CHEM 262 Wei You Chapter 21. Benzene and...

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Unformatted text preview: 11 CHEM 262 Wei You Chapter 21. Benzene and the Concept of Aromaticity (2) Nomenclature • Monosubstituted alkylbenzenes are named as derivatives of benzene – many common names are retained Toluen e Cumen e thylbenzene tyren e Pheno l Anilin e Benzoic acid Anisol e OOH H 2 O 3 O Benzaldehyde HO What are IUPAC names for cumene and styrene? 22 Nomenclature • Benzyl vs. Phenyl (Z)-2- Phenyl- 2- butene 4-(3-Methoxyphenyl)- 2-butanone 1-Phenyl- 1pentanone O O 3 O Ph Benzen e henyl group, Ph- Toluen e Benzyl group, Bn- CH 3 CH 2- 33 If the alkyl substituent is the same size or smaller than the ring (six or fewer carbons), the compound is named as an alkyl substituted benzene If the alkyl substituent is larger than the ring (more than six carbons), the compound is named as a phenyl substituted alkane Disubstituted Benzenes • Locate two groups by numbers or by the locators ortho (1,2-), meta (1,3-), and para (1,4-) – where one group imparts a special name, name the compound as a derivative of that molecule CH 3 Br COOH NO 2 Cl NH 2 CH 3 CH 3 2-Nitrobenzoic acid ( o-Nitrobenzoic acid ) 3-Chloroaniline ( m-Chloroaniline) 4-Bromotoluene ( p-Bromotoluene) m-Xylene 44 Disubstituted Benzenes – where neither group imparts a special name, locate the groups...
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This note was uploaded on 06/12/2010 for the course CHEM 261 taught by Professor Austell during the Spring '08 term at UNC.

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Chapter 21-2 - 11 CHEM 262 Wei You Chapter 21. Benzene and...

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