Reactions of the in situ generated peripheral azomethine ylide dipoles 2a–d with the kinetically stabilised phosphaalkynes 3a–c give rise to the title compounds 6a–f which possess a 14π-perimeter including a phosphorus atom in a low coordination as shown by the limiting forms 6A and 6B.
U. Bergsträßer, J. Stannek and M. Regitz, J. Chem. Soc., Chem. Commun., 1994, 1121 DOI: 10.1039/C39940001121
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