1392015-10-9Relevant articles and documents
Rearrangements of phosphinoimines to phosphine-imines in ruthenium chelate complexes
Brown, Christopher C.,Stephan, Douglas W.
, p. 9431 - 9438 (2012/09/05)
Thermal reaction of 1:1 mixtures of the RuCl2(PPh 3)3 and phosphinoimine R2PNCPh2 (R = Ph, iPr, Me) at 140 °C results in isolation of the dimeric species [RuCl(μ-Cl)(PPh3)(C6H4(PPh 2)C(Ph)NH)]2 (R = Ph 1, iPr 2, Me 3) containing phosphine-imine chelating ligands. Subsequent reaction of 1 and 3 with one equivalent of pyridine at room temperature give RuCl2(PPh 3)(py)(C6H4(PR2)C(Ph)NH) (R = Ph 4, Me 5). Excess pyridine reacts with 2 to give a mixture of the cis and trans-isomers of RuCl2(py)2(C6H 4(PiPr2)C(Ph)NH) 6 and 7 respectively. Treatment of 5 with excess PPh3 affords RuCl2(PPh3) 2(C6H4(PMe2)C(Ph)NH) 8. Aspects of the mechanism of the thermal rearrangements of the phosphinoimine to the phosphine-imine ligands are considered and the isolation of RuCl 2(Ph2PNCPh2)(SIMes)(CHPh) 9 and RuCl 2(PPh3)2(HNC(Ph)C6H4) 10 provide support for a proposed mechanism involving a intermediate containing a Ru-bound metallated aryl-imine fragment.