Question 12.9: What is the IUPAC name of the following alkane?
What is the IUPAC name of the following alkane?
\begin{array}{r c} \underset{|}{\quad \; CH_3} \qquad \quad \; \; \> \underset{|}{\quad \; CH_3} \hspace{30 pt} \quad \; \; \\ CH_3 – CH – CH_2 – CH_2 – CH – CH_2 – CH_3 \> \end{array}ANALYSIS Follow the four steps outlined in the text.
STEP 1: The longest continuous chain of carbon atoms is seven, so the main chain is a heptane.
STEP 2: Number the main chain beginning at the end nearer the first branch:
\begin{array}{r c} \underset{|}{\quad \; CH_3} \qquad \quad \; \; \> \underset{|}{\quad \; CH_3} \hspace{30 pt} \quad \; \; \\ CH_3 – CH – CH_2 – CH_2 – CH – CH_2 – CH_3 \> \\ \pmb{ 1 \quad \enspace \; \; 2 \quad \; \; 3 \quad \enspace \enspace 4 \quad \enspace \; \; 5 \quad \; 6 \quad \enspace \; 7 \quad \quad } \end{array}STEP 3: Identify and number the substituents (a 2-methyl and a 5-methyl in this case):
STEP 4: Write the name as one word, using the prefix di- because there are two methyl groups. Separate the two numbers by a comma, and use a hyphen between the numbers and the word.
Name: 2, 5-Dimethylheptane
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