The η2-alkyne complex (C5H5)(PMe3)2Ru(HC![[triple bond, length half m-dash]](https://www.rsc.org/images/entities/char_e007.gif)
CMe)+PF6–, which was isolated from a reaction of HCCMe with (C5H5)(PMe3)2RuCl, undergoes first-order rearrangement to give (C5H5)(PMe3)2Ru![[double bond, length half m-dash]](https://www.rsc.org/images/entities/char_e006.gif)
CC(H)Me + PF6–; at higher tempreatures in MeCN, this vinylidene complex cleanly regenerates HCCMe and forms (C5H5)(PMe3)2Ru(MeCN)+PF6–.
R. M. Bullock, J. Chem. Soc., Chem. Commun., 1989, 165 DOI: 10.1039/C39890000165
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