Terminal acetylenes react with [FeH2(dmpe)2][dmpe = bis(dimethylphosphino)ethane] to form metal acetylides and diacetylides; the crystal structure of trans-Fe(C![[triple bond, length half m-dash]](https://www.rsc.org/images/entities/char_e007.gif)
CPh)2(dmpe)2 shows that the seven atoms of the C–CC–Fe–CC–C grouping are colinear and the bond lengths indicate a strong Fe–C bond and an unusually short C–C triple bond.
L. D. Field, A. V. George, T. W. Hambley, E. Y. Malouf and D. J. Young, J. Chem. Soc., Chem. Commun., 1990, 931 DOI: 10.1039/C39900000931
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