Phosphonium–betaine (ylide–carbene) complexes have been synthesised via nucleophilic attack by P(OR)3 on a σ-π-acetylide complex Fe2(CO)6(C![[triple bond, length half m-dash]](https://www.rsc.org/images/entities/char_e007.gif)
CPh)(PPh2), and a single crystal X-ray study of the triethylphosphite derivative Fe2(CO)6{C[P(OEt)3]CPh}(PPh2) has con-firmed the presence of a new type of 2-carbon, 3-electron ligand.
Y. S. Wong, H. N. Paik, P. C. Chieh and A. J. Carty, J. Chem. Soc., Chem. Commun., 1975, 309 DOI: 10.1039/C39750000309
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