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How are alcohols named using the IUPAC system?
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The International Union of Pure and Applied Chemistry (IUPAC) system provides a systematic method for naming alcohols. The process follows these three steps:
- Identify the parent chain: Determine the longest carbon chain that contains the carbon atom bonded to the hydroxyl (–OH) group. Use the corresponding alkane name, drop the final "-e," and add the suffix "-ol."
- Number the chain: Number the longest carbon chain starting from the end closest to the –OH group. Use this number to indicate the position of the hydroxyl group if necessary.
- Name substituents: Identify and name any additional substituents, providing their positions using the same numbering rules applied to alkanes or alkenes.1
For cyclic alcohols, the prefix "cyclo-" is used, and the hydroxyl group is assumed to be on carbon 1. The ring is then numbered to ensure other substituents receive the lowest possible numbers.1