Portmess Homework Solutions 32

Portmess Homework Solutions 32 - 3 ) 4 C, has three carbons...

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26 ALKANES 2.5 ( b ) Octacosane is not listed in Table 2.4, but its structure can be deduced from its systematic name. The suf f x -cosane pertains to alkanes that contain 20 29 carbons in their longest con- tinuous chain. The pre f x octa- means eight. Octacosane is therefore the unbranched alkane having 28 carbon atoms. It is CH 3 (CH 2 ) 26 CH 3 . ( c ) The alkane has an unbranched chain of 11 carbon atoms and is named undecane. 2.6 The ending -hexadecane reveals that the longest continuous carbon chain has 16 carbon atoms. There are four methyl groups (represented by tetramethyl-), and they are located at carbons 2, 6, 10, and 14. 2.7 ( b ) The systematic name of the unbranched C 5 H 12 isomer is pentane (Table 2.4). A second isomer, (CH 3 ) 2 CHCH 2 CH 3 , has four carbons in the longest continuous chain and so is named as a derivative of butane. Since it has a methyl group at C-2, it is 2-methylbutane. The remaining isomer, (CH
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Unformatted text preview: 3 ) 4 C, has three carbons in its longest continuous chain and so is named as a derivative of propane. There are two methyl groups at C-2, and so it is a 2,2-dimethyl derivative of propane. ( c ) First write out the structure in more detail, and identify the longest continuous carbon chain. There are f ve carbon atoms in the longest chain, and so the compound is named as a deriva-tive of pentane. This f ve-carbon chain has three methyl substituents attached to it, making it C CH 3 CH 3 CH 3 CH 2 C H CH 3 CH 3 IUPAC name: 2,2-dimethylpropane Common name: neopentane CH 3 CCH 3 CH 3 CH 3 IUPAC name: 2-methylbutane Common name: isopentane methyl group at C-2 CH 3 CHCH 2 CH 3 CH 3 IUPAC name: pentane Common name: n-pentane CH 3 CH 2 CH 2 CH 2 CH 3 2,6,10,14-Tetramethylhexadecane (phytane) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16...
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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.

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