Question 11.6: Drawing Condensed Structures from IUPAC Names Draw the conde...

Step \fbox{1}   Draw the main chain of carbon atoms. For butane, we draw a chain of four carbon atoms.

C-C-C-C               

Step \fbox{2}   Number the chain and place the substituents on the carbons indicated by the numbers. The first part of the name indicates two methyl groups CH_{3}— : one on carbon 2 and one on carbon 3.

\begin{array}{r c}\begin{matrix} \text { Methyl } \text { Methyl } \\ {\underset{|}{{CH_{3}}}} {\underset{|}{{CH_{3}}}} \\ C-C-C-C \\ 1 \quad \ 2 \quad \ \ 3 \quad \ 4 \end{matrix}\\ \end{array}           

Step \fbox{3}   Add the correct number of hydrogen atoms to give four bonds to each C atom.

\begin{array}{r c}\begin{matrix} \quad  {\underset{|}{{CH_{3}}}} \quad {\underset{|}{{CH_{3}}}}  \\  {CH_{3}}-CH-CH-CH_{3} \\ \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad 2,3- \text {Dimethylbutane}  \end{matrix}\end{array}              

Guide to Drawing Alkane Formulas

Step \fbox{1}

Draw the main chain of carbon atoms.

Step \fbox{2}

Number the chain and place the substituents on the carbons indicated by the numbers.

Step \fbox{3}

Add the correct number of hydrogen atoms to give four bonds to each C atom.