2444-110711

2444-110711 - Nomenclature: Arenes Arenes are named using...

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Nomenclature: Arenes 1 • Arenes are named using the alkyl name of the substituent with benzene, so an arene becomes an alkyl benzene. • Compound 8 is named methylbenzene but its common name is toluene, a common constituent of paint solvents. • Similarly, compound 9 is ethylbenzene. Is the parent compound of 10 benzene, or is benzene a substituent? I • In general, if a benzene ring is attached to an alkane carbon chain of Fve or more carbon atoms, the benzene ring is treated as a substituent. 10 is named 2-phenylpentane. 8 9 10
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Nomenclature: Arenes 2 • Three dimethylbenzene derivatives are known: 1,2-dimethylbenzene ( 11 ), 1,3- dimethylbenzene ( 12 ), and 1,4-dimethylbenzene ( 13 ). • The common name for the dimethylbenzenes is xylene. In the common nomenclature, two substituents with a 1,2-relationship are said to be ortho- ; those with a 1,3-relationship are said to be meta- , and those with a 1,4-relationship are said to be para- . Using this system, 11 is called ortho- xylene (or o- xylene), 12 is called meta- xylene (or m- xylene) and 13 is called para- xylene (or p- xylene). CH 3 CH 3 CH 3 CH 3 CH 3 CH 3 11 12 13 Arene 14 is 1,2,4-trimethylbenzene. 14
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3 • 15 has an ethenyl group is known as ethenylbenzne, but the common name is styrene. • Compound 16 is E- 1,2-diphenylethene but it is commonly called trans- stilbene. • Compound
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2444-110711 - Nomenclature: Arenes Arenes are named using...

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