Question 14.1: Write the IUPAC name of each alcohol.
Write the IUPAC name of each alcohol.
Strategy
Follow the steps outlined above.
Step 1: Identify the parent chain.
Step 2: Change the ending of the parent alkane from -e to -ol and use a number to show the location of the —OH group.
Step 3: Name and number substituents and list them in alphabetical order.
Step 4: Specify configuration if cis-trans isomerism exists.
Solution
(a) The parent alkane is pentane. Number the parent chain from the direction that gives the lower number to the carbon bearing the —OH group. This alcohol is 4-methyl-2-pentanol.
(b) The parent cycloalkane is cyclohexane. Number the atoms of the ring beginning with the carbon bearing the —OH group as carbon 1 and specify that the methyl and hydroxyl groups are trans to each other. This alcohol is trans-2 methylcyclohexanol.