Chemistry · Ch 13 — Hydrocarbons

Alkynes

13.4

Alkynes

Alkynes are unsaturated hydrocarbons containing a carbon-carbon triple bond, general formula CnH2n-2. The first member is ethyne, popularly known as acetylene; the oxyacetylene torch used in welding burns it. NOTE ON THE SOURCE TEXT: the book's own printed section heading here literally reads '13.4. Alkenes:' -- a genuine misprint verified against the original page image -- even though every sentence beneath it, and the whole of sub-section 13.4.1 (correctly headed 'General Methods Of Preparation Of Alkynes'), is unmistakably about alkynes; this section is filed here as '13.4 Alkynes' for …

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Nomenclature of Alkynes

Alkynes are IUPAC-named by the same rules used for alkanes/alkenes (Unit 11), replacing the ending with '-yne' and giving the triple bond the lowest possible locant. Worked examples include propyne, 1-but …

Table 13.8IUPAC names for alkynes

Structure (condensed)	IUPAC name
CH3-C $\equiv$ CH	Propyne
CH3-CH2-C $\equiv$ CH	1-butyne
CH3-C $\equiv$ C-CH3	2-butyne

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