Treatment of the µ-vinyl cation [Ru2(CO)(McCN)(µ-CO)(µ-CH![[double bond, length half m-dash]](https://www.rsc.org/images/entities/char_e006.gif)
CH2)(η-C5H5)2]+ with ethylene (1 atm, 25 °C) gives two isomers of [Ru2(CO)2(µ-H)(µ-CH2CHCHCH2)(η-C5H5)2]+, containing (S)-cis- or (S)-trans-butadiene; deprotonation is effected with KOH/ethanol to afford the neutral (S)-trans-butadiene complex [Ru2(CO)2(µ-CH2CHCHCH2)(η-C5H5)2].
G. C. Bruce, S. A. R. Knox and A. J. Phillips, J. Chem. Soc., Chem. Commun., 1990, 716 DOI: 10.1039/C39900000716
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