Organic and biochemistry Assistance Lecturer Amjad Ahmed Jumaa o Nomenclature of the alkene  IUPAC nomenclature 1

Nomenclature of the alkenes IUPAC nomenclature: The rules of the IUPAC system are: 1-select as the parent structure the longest continuous chain that contains the carbon-carbon double bond; then consider the compound to have been derived from this structure by replacement of hydrogen by various alkyl groups.  Each name is derived by changing the ending – ane of the corresponding alkane name to –ene. Nomenclature of the alkenes IUPAC nomenclature: The rules of the IUPAC system are: 1-select as the parent structure the longest continuous chain that contains the carbon-carbon double bond; then consider the compound to have been derived from this structure by replacement of hydrogen by various alkyl groups.  Each name is derived by changing the ending – ane of the corresponding alkane name to –ene.

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2-indicate by a number the position of the double bond in the parent chain. We were numbering from the end of the chain nearest the double bond:

5 3-indicate by numbers the positions of the alkyl groups attached to the parent chain:

Problem: name the following alkene using IUPAC nomenclature: Solution:

7 Follow problem: name each of the following using IUPAC nomenclature:

Problem: give the structural formula for the following? 1-(2-methyl propene) 2-(4-methyl-2-pentene) 3-(3, 3-dimethyl-1- butene). Solution:

9 Follow problem: give the structural formula for the following? 1-(3-ethyl-1-hexene) 2-(2, 3-dimethyl-2-butene) 3-(5-ethyl-4- methyl-2-heptene).