Chapter 5 Fouctional Groups and Nomenclature â… 

Chapter 5 Fouctional Groups and Nomenclature â… 

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1 Chapter 5 Functional Groups and Nomenclature I h 5.1~5.4 Nomenclature of alkanes 1) Nomenclature of unbranched-chain alkanes Suffix: - ane methane ~ decane ~ nonadecane Alkyl groups: Suffix: - yl C-C-C-, C-C-C-C-, C-C-C-, C C-C C C C-C-C-C, C-C-C, CH 3 -, C-C-, isobutyl 2-methylpropyl tert -butyl sec -butyl methyl ethyl isopropyl
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2 2) Nomenclature of branched-chain alkanes i. Choose the longest continuous chain with the greatest number of substituents as the parent body. 3 -methylheptane 2,3,5-trimethyl-4- propylheptane ii. Give the lowest position numbers for substituents. 2,3,3-trimethylpentane 2,2,4-trimethylpentane C-C-C-C-C-C C C C-C-C-C-C-C-C C C C C C C C-C-C-C-C C C C C-C-C-C-C C C C
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3 2,3,5-trimethylhexane 3-ethyl-5-methylheptane iii. Give the first listed substituent a lower position number; the sum of the position numbers for all sbustituents should be as low as possible. C-C-C-C-C-C C C C C-C-C-C-C-C-C C C C C-C-C-C-C-C Cl ClCl 2,3,5-trichlorohexane not 2,4,5-trichlorohexane C-C-(CH 2 ) 4 -C-C-C-C C C C 2,7,8-trimethyldecane not 3,4,9-trimethyldecane
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4 5.5 Nomenclature of cycloalkanes 1) monocyclic compounds cyclo + the name of alkane cyclopropane cyclopentane cyclohexane monosubstituted: chlorocyclohexane methylcyclopentane Cl CH 3
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5 Cl CH 3 1-chloro-3-methylcyclohexane 1-¼×»ù-3-ÂÈ»·¼ºÍé OH Cl 3-chlorocyclopentanol cyclopentylcyclohexane OH 3-cyclohexylcyclopentanol multisubstituted: Give the functional group the lowest position number. The sum of position numbers for all substituents should be as low as possible.
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Chapter 5 Fouctional Groups and Nomenclature â… 

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