By using flash vaccum conditions the thermal elimination of Ph3PO from β-oxoalkylidenetriphenylphosphoranes, previously confined to cases with an α-electron withdrawing group, has been extended to provide a general, high yielding synthesis of aliphatic and terminal alkynes.
R. A. Aitken and J. I. Atherton, J. Chem. Soc., Chem. Commun., 1985, 1140 DOI: 10.1039/C39850001140
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