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Unformatted text preview: CnH2 n .
· To use the IUPAC rules for naming alkenes: 1. Select the longest continuous carboncarbon chain that contains the double bond. 2. Name this parent compound as you would an alkane, but change the –ane ending to –ene. 3. Number the carbon chain o f the parent compound starting with the end nearer to the double bond. Use the smaller of the two numbers on the doublebonded carbon atoms to indicate the posit ion of the double bond. Place this number in front of the alkene name. 4. Branch chains and other groups are treated as in naming alkanes, by numbering and assigning them to the carbon atom to which they are bonded. CH3CH=CHCH3 2butene CH3CH2CH2CH=CH2 1pentene CH3 ï
CH3CHCH2CH=CH2 4methyl1pentene CH2CH3
ï CH3CH2CH2CHCH=CH2 3ethyl1hexene Examples: 1. Write a structural formula for 4methyl2pentene. 2. Write a structural formula for 7methyl2octene. H 2 C 3. Name the co mpound shown : H C 3 H 2 C C CH 2 2 CH 3 C H 2 Chemistry 52 Chapter 20 GEOMETRIC ISOMERS
· Compounds containing a carboncarbon doub...
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