![]() ![]() Let’s see how these modification affects naming in the following alkane and alkyne: The latest IUPAC recommendation is to place the locant before the suffix “yne.” However, both options are acceptable. The triple bond should receive the lowest possible locant in the parent chain despite the presence of alkyl substituents. There are two main differences you need to consider when naming alkynes:ġ) The longest chain must include the triple bond.Ģ) Change the suffix in the parent chain from “ane” to “yne”. Step 4. Put everything together having the substituents in alphabetical order.Īnd this is an example of naming an alkane: Step 3. Number the parent chain giving the triple bond the lowest locant Naming alkynes follows the same rules we discussed earlier for the IUPAC nomenclature rules for alkanes.
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