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Portmess Homework Solutions 34

Portmess Homework Solutions 34 - 28 ALKANES(c The longest...

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( c ) The longest continuous chain is shown in the structure; it contains ten carbon atoms. The structure also shows the numbering scheme that gives the lowest number to the substituent at the fi rst point of difference. In alphabetical order, the substituents are ethyl (at C-8), isopropyl at (C-4), and two methyl groups (at C-2 and C-6). The alkane is 8-ethyl-4-isopropyl-2,6-dimethyldecane. The system- atic name for the isopropyl group (1-methylethyl) may also be used, and the name becomes 8-ethyl-2,6-dimethyl-4-(1-methylethyl)decane. 2.10 ( b ) There are ten carbon atoms in the ring in this cycloalkane, thus it is named as a derivative of cyclodecane. The numbering pattern of the ring is chosen so as to give the lowest number to the substituent at the fi rst point of difference between them. Thus, the carbon bearing two methyl groups is C-1, and the ring is numbered counterclockwise, placing the isopropyl group on C-4 (numbering clockwise would place the isopropyl on C-8). Listing the substituent groups in al- phabetical order, the correct name is 4-isopropyl-1,1-dimethylcyclodecane. Alternatively, the
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