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Unformatted text preview: NOMENCLATURE RULES A chemical name (using IUPAC rules) contains a prefix (or prefixes), a root and a suffix. The prefixes contain information about functional groups other than highest priority functional group (HPFG). The root corresponds to the longest carbon chain containing the HPFG. The root also contains information about the carbon chain, i.e. if it is an alkane, alkene or alkyne. The suffix identifies the HPFG. OH OH O NH 2 ( R )-3-ethyl-3,6-dihydroxyhexanamide prefixes root suffix Steps in naming a compound 1. Determine the HPFG (see the list). This will give you the suffix. An amide has the suffix of amide. 2. Determine the longest carbon chain that contains the HPFG. A six carbon chain is the longest, so we use hex as the root. 3. Determine if there are alkenes or alkynes in the carbon chain. If there are, use en or yn in the root; if not, use an. We have no alkenes or alkynes, so we use an. 4. Determine the appropriate prefixes for the remaining functional groups (groups not included in the root or suffix). There are two OH groups (hydroxyl groups) and an ethyl group. 5. Assign numbers to the carbons in the root carbon chain starting from the end that will give the lowest number to the HPFG. Add these numbers to the prefix and the suffix if necessary. When in doubt use the smallest numbers possible. The amide is carbon 1 and does not need designation, the ethyl group is at C-3, and the two hydroxyl groups are at C-3 and C-6....
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This note was uploaded on 12/08/2009 for the course CHEM 351 taught by Professor Staff during the Spring '08 term at BYU.
- Spring '08
- Organic chemistry