N.m.r. spectra and X-ray diffraction indicate the presence of intramolecular H ⋯ F hydrogen bonding between the methylene and alkene ligands in the complexes [Ru2(CO)(CF2![[double bond, length half m-dash]](https://www.rsc.org/images/entities/char_e006.gif)
CFR)(µ-CH2)(µ-CO)(η-C5H5)2](R = F or CF3); methylene–alkene combination occurs via HF elimination under mild conditions, giving [Ru2(CO)(µ-CHCFCFR)(µ-CO)(η-C5H5)2].
J. A. K. Howard, S. A. R. Knox, N. J. Terrill and M. I. Yates, J. Chem. Soc., Chem. Commun., 1989, 640 DOI: 10.1039/C39890000640
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