A Ru−η6‑Arene Complex as a C‑Based Lewis Acid in the Activation of Hydrogen and Hydrogenation Catalysis

The PBP ligand (Ph2PC6H4)2BPh was used to prepare ((Ph2PC6H4)2B(Cl)(η6-Ph)RuCl (1) and subsequently [((Ph2PC6H4)2B(η6-Ph))RuCl]­[B(C6F5)4] (2). The latter species exhibited Lewis acidity on the η6-Ph ring, as reaction with Cy3P gave the donor–acceptor adduct [(Ph2PC6H4)2B(η5-C6H5-o-PCy3)RuCl]­[B(C6F...

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Veröffentlicht in:Journal of the American Chemical Society 2013-06, Vol.135 (23), p.8508-8511
Hauptverfasser: Boone, Michael P, Stephan, Douglas W
Format: Artikel
Sprache:eng
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Zusammenfassung:The PBP ligand (Ph2PC6H4)2BPh was used to prepare ((Ph2PC6H4)2B(Cl)(η6-Ph)RuCl (1) and subsequently [((Ph2PC6H4)2B(η6-Ph))RuCl]­[B(C6F5)4] (2). The latter species exhibited Lewis acidity on the η6-Ph ring, as reaction with Cy3P gave the donor–acceptor adduct [(Ph2PC6H4)2B(η5-C6H5-o-PCy3)RuCl]­[B(C6F5)4] (3). Steric frustration of this binding was seen with Mes3P, and yet the combination of 2 and Mes3P reacted with H2 to give a 2:1 mixture of 5- o and 5- p , two isomers of [(Ph2PC6H4)2B(η5-C6H6)RuCl] (5), along with [Mes3PH]­[HB(C6F5)3]. Compound 2 behaves as C-based Lewis acid and thus can also be used for catalytic hydrogenation of aldimines at room temperature via a frustrated Lewis pair mechanism.
ISSN:0002-7863
1520-5126
DOI:10.1021/ja403912n