Ch_322a_4.03 - CH 3 CHCH 2-CH 3 CH 3 CCH 3 CH 3 or CH 3...

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Nomenclature of Branched Alkyl Groups In methane and ethane, all the H are equivalent. Therefore, only one alkyl group is possible for each. C H H H H C H H H methane methyl C H H H C H H H C H H H C H H ethane ethyl
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Branched Alkyl Groups from the Higher Alkanes Beginning with C 3 , more than one type of H is present. Different alkyl groups are formed depending on which H is removed. CH 3 C H 2 CH 3 propane C C C H H H H H H H H two equivalent H six equivalent H CH 3 CH 2 CH 2 - CH 3 CHCH 3 or CH 3 CH- CH 3 propyl isopropyl or 1-methylethyl
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Alkyl Groups Derived from the Butanes Each constitutional isomer of the butanes yields two alkyl groups. Butane CH 3 C H 2 C H 2 CH 3 H-C-C-C-C-H H H H H H H H H four equivalent H six equivalent H CH 3 CH 2 CH 2 CH 2 - CH 3 CH 2 CHCH 3 or CH 3 CH 2 C- CH 3 H butyl sec.-butyl or 1-methylpropyl
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Isobutane CH 3 C H CH 3 CH 3 C C C C H H H H H H H H H H one H nine equivalent H
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Unformatted text preview: CH 3 CHCH 2-CH 3 CH 3 CCH 3 CH 3 or CH 3 C-CH 3 CH 3 isobutyl or 2-methylpropyl tert.-butyl or 1,1-dimethylethyl Branched Alkyl Groups as Substituents CH 3 CH 2 CH 2 CHCH 2 CH 2 CH 3 CH 3 CCH 3 CH 3 The common names isopropyl, isobutyl, sec-butyl, and tert-butyl are approved by the IUPAC for the unsubstituted alkyl groups. 4-tert-butyl heptane or 4-(1,1-dimethylethyl) heptane Neopentane and the Neopentyl Group An additional IUPAC approved common name is the C 5 alkyl group derived from neopentane. CH 3-C-CH 3 CH 3 CH 3 neopentane (a constitutional isomer of C 5 H 12 ) CH 3-C-CH 2-CH 3 CH 3 neopentyl or 2,2-dimethylpropyl...
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