C_10J_Lecture_3_2012.pdf - CHEM1901 Lecture 3 Nomenclature in Alkenes • The ending ene is used to designate the carbon-carbon double bond • The

C_10J_Lecture_3_2012.pdf - CHEM1901 Lecture 3 Nomenclature...

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CHEM1901 Lecture # 3
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Nomenclature in Alkenes The ending ene is used to designate the carbon-carbon double bond The longest chain containing both carbons of the double bond is selected as the parent structure The chain (≥ 4) is numbered beginning at the end of the chain nearer the double bond to assign it the lowest possible number The number of the first atom of the double bond is used as the prefix 1-butene 2-heptene CH 3 CH 2 CH=CH 2 CH 3 CH=CH(CH 2 ) 3 CH 3
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The positions of substituents are indicated by the numbers of the carbon atom to which they are attached If more than one double bond is present in the molecule, C C CHCH 2 Br CH 3 CH 3 H 3 C CH 3 1-bromo-3,4,4-trimethyl-2-pentene numbering begins from the end closer to the first double bond with the name ending with diene H 2 C CH CH CH CH 3 1 2 3 4 5 1,3-pentadiene
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Naming Cyclic alkenes Cycloalkenes are designated in such a way as to assign: the 1-and 2- positions to the carbon atoms of the double bond The lowest combination of numbers to substituents CH 2 CH 3 1-ethylcyclopentene CH 3 CH 3 H 3 C 3,3,5-trimethylcyclohexene
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