Question 12.1: Write the IUPAC name of each unsaturated hydrocarbon.(a) CH2...
Write the IUPAC name of each unsaturated hydrocarbon.
(a) CH_{2}=CH(CH_{2})_{5}CH_{3}(b) \begin{array}{r c }\begin{matrix}H_3C& &&&&& CH_3 \\ &\diagdown&&&&\diagup \\ &&C &=&C \\ &\diagup&&&&\diagdown \\H_3C&&&&&&H \end{matrix} \end{array}
(c) CH_{3}(CH_{2})_{2}C≡CCH_{3}
Strategy
Step 1: Locate the parent chain—the longest chain of carbon atoms that contains the carbon–carbon double or triple bond.
Step 2: Number the parent chain from the direction that gives the carbons of the double or triple bond the lower set of numbers. Show the presence of the multiple bond by the suffix -ene (for a double bond) or -yne (for a triple bond). Indicate the presence of the multiple bond by its first number.
Step 3: Name and locate all substituents on the parent chain. List them in alphabetical order.
(a) The parent chain contains eight carbons; thus, the parent alkene is octene. To show the presence of the carbon–carbon double bond, use the suffix -ene. Number the chain beginning with the fi rst carbon of the double bond. This alkene is 1-octene.
(b) Because there are four carbon atoms in the chain containing the carbon–carbon double bond, the parent alkene is butene. The double bond is between carbons 2 and 3 of the chain, and there is a methyl group on carbon 2. This alkene is 2-methyl-2-butene.
(c) There are six carbons in the parent chain, with the triple bond between carbons 2 and 3. This alkyne is 2-hexyne.