Rearrangement of a metal (η2-alkyne) complex to a metal vinylidene and subsequent reaction of the metal vinylidene to regenerate the alkyne
Abstract
The η2-alkyne complex (C5H5)(PMe3)2Ru(HCCMe)+PF6–, which was isolated from a reaction of HCCMe with (C5H5)(PMe3)2RuCl, undergoes first-order rearrangement to give (C5H5)(PMe3)2RuCC(H)Me + PF6–; at higher tempreatures in MeCN, this vinylidene complex cleanly regenerates HCCMe and forms (C5H5)(PMe3)2Ru(MeCN)+PF6–.