Question 14.7: Write the IUPAC name of each thiol.

Write the IUPAC name of each thiol.

Strategy
To derive the IUPAC name of a thiol, select as the parent alkane the longest carbon chain that contains the —SH group. Show that the compound is a thiol by adding the suffix -thiol to the name of the parent alkane. Number the parent chain in the direction that gives the —SH group the lower number.

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Solution
(a) The parent alkane is pentane. Show the presence of the —SH group by adding “thiol” to the name of the parent alkane. The IUPAC name of this thiol is 1-pentanethiol. Its common name is pentyl mercaptan.

(b) The parent alkane is butane. The IUPAC name of this thiol is 2-butanethiol. Its common name is sec-butyl mercaptan.

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