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Unformatted text preview: 30 ALKANES There is one isomer characterized by an ethyl substituent on a ﬁve-carbon chain:
3-Ethylpentane The remaining isomer has three methyl substituents attached to a four-carbon chain.
2,2,3-Trimethylbutane 2.17 In the course of doing this problem, you will write and name the 17 alkanes that, in addition to octane, CH3(CH2)6CH3, comprise the 18 constitutional isomers of C8H18.
(a) The easiest way to attack this part of the exercise is to draw a bond-line depiction of heptane
and add a methyl branch to the various positions. 2-Methylheptane (b) 3-Methylheptane 4-Methylheptane Other structures bearing a continuous chain of seven carbons would be duplicates of these
isomers rather than unique isomers. “5-Methylheptane,” for example, is an incorrect name for
3-methylheptane, and “6-methylheptane” is an incorrect name for 2-methylheptane.
Six of the isomers named as derivatives of hexane contain two methyl branches on a continuous chain of six carbons. 2,2-Dimethylhexane 2,3-Dimethylhexane 2,4-Dimethylhexane 3,3-Dimethylhexane 2,5-Dimethylhexane 3,4-Dimethylhexane One isomer bears an ethyl substituent: 3-Ethylhexane (c) Four isomers are trimethyl-substituted derivatives of pentane: 2,2,3-Trimethylpentane Back Forward Main Menu TOC 2,3,3-Trimethylpentane 2,2,4-Trimethylpentane Study Guide TOC 2,3,4-Trimethylpentane Student OLC MHHE Website ...
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This note was uploaded on 09/20/2011 for the course CHM 2210 taught by Professor Reynolds during the Fall '01 term at University of Florida.
- Fall '01
- Organic chemistry