You must then locate and identify all the substituents that stick off of the parent chain, including multiple and complex branches. The presence of other substituents in alcohol is indicated by their names and numerical positions, always keeping the lowest possible number for the hydroxyl group. The generic IUPAC name for alcohol is alkanols, and they are represented in reactions by the general formula R-H. IUPAC Nomenclature for Alcohols Locate and name any other substituents. (In cyclic alcohols, the carbon atom bearing the OH group is designated C1, but the 1 is not used in the name.) Names of Alcohols. 3) the ending which specifies what functional group is present in the structure being named. Guide to Naming Alcohols. Classifying and naming alcohols is fairly straightforward. IUPAC: in IUPAC replace -e of Alkane with -ol Common names: put alkyl group then alcohol. Here we look at alkanes with halogen and hydroxyl substituents. • Step 5. Naming alkenes follows the same rules we discussed earlier for the IUPAC nomenclature rules for alkanes. Step 1 Name longest chain with -OH group Step 2 Number longest chain closer to -OH group Step 3 Name substituents from -OH Step 4 Name a cyclic alcohol as cyclo. This is the brief summary of the steps: Step 1. Now, let's look at how to name alcohols with additional substituents. Substituents are named and numbered as in alkanes. You can use the alkane name and simply add the word 'alcohol' after it. ... Find and name the substituents. More IUPAC nomenclature! Combine the name and location for other groups, the hydroxyl group location, and the longest chain into the final name. Identify the parent chain. Step 3. 8 Examples: Naming Alcohols and Phenols • Provide acceptable IUPAC names for the following compounds: CH3 OH CH3 CH2 OH CH3 CH2 CH2 OH CH3 CH CH3 OH CH3 CH CH2 OH CH3 Step 2. For example, to classify an alcohol, you just need to know where the hydroxyl group is in the alcohol molecule. An alcohol with additional substituents Start by finding the longest carbon chain that includes the alcohol group. Number the parent chain. The systematic methods of naming alcohols follow a similar procedure and the names have three main parts: 1) specifying the information about the substituents, 2) specifying the information about the parent chain, and. The number that indicates the position of the OH group is prefixed to the name of the parent hydrocarbon, and the -e ending of the parent alkane is replaced by the suffix -ol. Identify the substituents. When naming a branched alkane, you first need to locate and number the parent (longest) chain. Step 4. 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