Naming Alcohols,Phenols,and Thiols Simple alcohols are named in the IUPAC system as derivatives of the parent alkane,using the suffix -o/: Rule 1 Select the longest carbon chain containing the hydroxyl group,and derive the parent name by replacing the -e ending of the corresponding alkane with -o/ The -e is deleted to prevent the occurrence of two adjacent vowels Rule 2 Number the alkane chain beginning at the end nearer the hydroxyl group Simple alcohols are named in the IUPAC system as derivatives of the parent alkane, using the suffix –ol: Rule 1 Select the longest carbon chain containing the hydroxyl group, and derive the parent name by replacing the –e ending of the corresponding alkane with –ol ▪ The –e is deleted to prevent the occurrence of two adjacent vowels Rule 2 Number the alkane chain beginning at the end nearer the hydroxyl group Naming Alcohols, Phenols, and Thiols