This branch of IUPAC naming follows a logical system, yet the presence of a triple bond introduces specific rules that distinguish it from alkane and alkene naming. Common Name Systematic IUPAC Name Structure Ethyne (Acetylene) ethyne H-C≡C-H Propargyl alcohol prop-2-yn-1-ol HC≡C-CH2OH 1-Butyne but-1-yne CH3CH2C≡CH 3,3-Dimethyl-1-butyne 3,3-dimethylbut-1-yne (CH3)3C-C≡CH Advanced Scenarios and Functional Groups Complex molecules may contain both alkynes and other functional groups like alcohols or halogens.
Alkynes Naming Practice Flashcards
Handling Multiple Substituents When alkyl groups or other substituents are attached to the alkyne chain, they are named and prefixed just as in alkane nomenclature. The methyl group is attached to carbon 3, resulting in the complete name: 3-methylbut-1-yne.
The chain is numbered to give the triple bond the lowest number, followed by the other functional group. In these cases, the suffix "-yne" takes priority over other suffixes like "-ol" or "-yl halide" for the principal functional group.
Alkynes Naming Practice Flashcards
You must identify the longest continuous carbon chain that contains the triple bond; this chain dictates the base name, changing the suffix to "-yne". Crucially, the locant for the triple bond (the "-yne" ending) is assigned the number based on the direction of numbering that gives it the lowest possible value.
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