The parent phosphinine is obtained in ca. 40% yield by thermolysis of vinyldialiylphosphine at 700 °C at 10–3 Torr; under the same conditions, triallylphosphine mainly yields HC![[triple bond, length half m-dash]](https://www.rsc.org/images/entities/char_e007.gif)
P which can be purified by trap-to-trap distillation.
P. Le Floch and F. Mathey, J. Chem. Soc., Chem. Commun., 1993, 1295 DOI: 10.1039/C39930001295
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