[PDF] [PDF] Naming Alkenes

4 Indicate the double bond by the number of the first alkene carbon H3C CH2 CH2 CH CH CH3



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[PDF] Naming Alkenes

4 Indicate the double bond by the number of the first alkene carbon H3C CH2 CH2 CH CH CH3



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[PDF] Naming Alkenes

Naming Alkenes

Suffix: -ene

Many of the same rules for alkanes apply to alkenes

1.Name the parent hydrocarbon by locating the longest carbon chain that contains the

double bond and name it according to the number of carbons with the suffix -ene.

H3CCH2CH2

CCH2

CH2H3C

H3CCH2CH2

CCH2

CH2H3C

Parent = pentenenot hexene

(does not contain double bond)2.a. Number the carbons of the parent chain so the double bond carbons have the

lowest possible numbers.

H3CCH2CH2CHCHCH3

123456

2-hexeneb. If the double bond is equidistant from each end, number so the first substituent

has the lowest number.

H3CCHCHCHCH2CH3

123456

2-methyl-3-hexene

CH33.Write out the full name, numbering the substituents according to their position in the chain and list them in alphabetical order.

4.Indicate the double bond by the number of the first alkene carbon.

H3CCH2CH2CHCHCH3

123456

2-hexene5.If more than one double bond is present, indicate their position by using the number

of the first carbon of each double bond and use the suffix -diene (for 2 double bonds), -triene (for 3 double bonds), -tetraene (for 4 double bonds), etc.

H2CCHCH2CHCH2

12345

1,4-pentadiene

H2CCHCHCHCH3

12345

1,3-pentadiene

6.a. Cycloalkenes are named in a similar way. Number the cycloalkene so the double

bond carbons get numbers 1 and 2, and the first substituent is the lowest possible number.CH3 1 2 3

3-methylcyclohexene

CH3 1 2 3 4 5 6 NOT

6-methylcyclohexeneb. If there is a substituent on one of the double bond carbons, it gets number 1.

CH3 CH3 CH3 CH3 1 23
4 5 1 2 3 4 5

1,5-dimethylcyclopenteneNOT

2,3-dimethylcyclopenteneAlkenes as Substituents:

CHCH2 ethenyl or vinyl (vinylcyclohexane)

CH2CHCH2

2-propenyl or allyl

(allylcyclohexane) CH2 methylene (methylenecyclohexane) HC CH3 ethylidene (ethylidenecyclohexane)Non-IUPAC Alkenes (Table 6.1, pg. 184)

H2CCH2CHCH2H3C

ethylene (ethene)propylene (propene) CCH2 H3C H3Cquotesdbs_dbs2.pdfusesText_3