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Advanced level organic chemistry PART 14.7: Structural isomers of molecular formula C9H20

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Doc Brown's Advanced Chemistry: Part 14.7

Structural carbon chain isomers of molecular formula C9H20

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See also Examples of the effects of isomerism on the similarity or difference in the physical and chemical properties of structural isomers

Examples of the 35 alkane carbon chain structural isomers of molecular formula C9H20 (Mr = 128)

Examples of carbon chain isomerism

Some of the structural isomers also exhibit R/S (optical isomerism) as well as carbon chain isomerism

nonane, CH3CH2CH2CH2CH2CH2CH2CH2CH3  or  CH3(CH2)7CH3

2-methyloctane, CH3CH2CH2CH2CH2CH2CH(CH3)2

3-methyloctane, CH3CH2CH2CH2CH2CH(CH3)CH2CH3 (R/S isomers, 3rd C is chiral)

4-methyloctane, CH3CH2CH2CH2CH(CH3)CH2CH2CH3 (R/S isomers, 4th C is chiral)

There are lots of highly branched structural isomers of C9H20 e.g.

3-ethyl-2,2-dimethylpentane, isomers of C9H20 structural formula 3-ethyl-2,2-dimethylpentane alkanes molecular structure naming (c) doc b , 3-ethyl-2,2-dimethylpentane skeletal formula alkanes molecular structure naming (c) doc b

3-ethyl-2,3-dimethylpentane, isomers of C9H20 structural formula 3-ethyl-2,3-dimethylpentane alkanes molecular structure naming (c) doc b , 3-ethyl-2,3-dimethylpentane skeletal formula alkanes molecular structure naming (c) doc b  (R/S isomers)

3-ethyl-2,4-dimethylpentane, isomers of C9H20 structural formula 3-ethyl-2,4-dimethylpentane alkanes molecular structure naming (c) doc b , 3-ethyl-2,4-dimethylpentane skeletal formula alkanes molecular structure naming (c) doc b 

3-ethyl-2-methylhexane , isomers of C9H20 structural formula 3-ethyl-2-methylhexane alkanes molecular structure naming (c) doc b , 3-ethyl-2-methylhexane skeletal formula alkanes molecular structure naming (c) doc b  and has a chiral (asymmetric) carbon atom (3rd C) - example of stereoisomerism - R/S (optical) isomers

ethyl-3-methylhexane , isomers of C9H20 structural formula 3-ethyl-3-methylhexane alkanes molecular structure naming (c) doc b , 3-ethyl-3-methylhexane skeletal formula alkanes molecular structure naming (c) doc b

3-ethyl-4-methylhexane , isomers of C9H20 structural formula 3-ethyl-4-methylhexane alkanes molecular structure naming (c) doc b , 3-ethyl-4-methylhexane skeletal formula alkanes molecular structure naming (c) doc b  and has a chiral (asymmetric) carbon atom (4th C) - example of stereoisomerism - R/S (optical) isomers

4-ethyl-2-methylhexane , isomers of C9H20 structural formula 4-ethyl-2-methylhexane alkanes molecular structure naming (c) doc b, 4-ethyl-2-methylhexane skeletal formula alkanes molecular structure naming (c) doc b


Associated links

Index of sets of isomers for a given molecular formula

The molecular structure and naming of ALKANES

Index of revision notes on the chemistry of ALKANES and the petrochemical industry

Isomerism: introduction, structural isomerism - chain, positional, functional group, tautomerism

Stereoisomerism: introduction, definition, priority rules, E/Z isomerism (cis/trans isomerism)

Stereoisomerism - R/S isomerism (optical isomerism) - definition - examples explained

index for all isomerism pages

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