82008-46-6Relevant academic research and scientific papers
Rapid, reversible ortho metalation in RuHCl[P(C6H5)3]3 and its role in the catalytic hydrogenation of alkynes
Stolzenberg, Alan M.,Muetterties, Earl L.
, p. 1739 - 1742 (2008/10/08)
Reaction of RuHCl[P(C6H5)3]3, 1, and alkynes produces the ortho-metalated complex RuCl[P(C6H4)(C6H5)2] [P(C6H5)3]2, 3, which is present during catalytic alkyne hydrogenation reactions. 3 is converted to 1 by reaction with H2. The 2H{1H} NMR spectrum of 1-d2 produced by reaction of D2 and 3 establishes rapid, reversible, intramolecular hydrogen isotope exchange between hydride and ortho-aryl phosphine sites, with deuterium preferred in the latter sites. The exchange and position of equilibrium result in an apparently slow rate of intermolecular exchange between D2 and the hydride site. Examination of hydrogen isotope exchange during alkyne hydrogenation establishes that 3 is not an intermediate in the hydrogenation reaction.
