摘要:
The room-temperature reaction of thallium perfluorophenoxide with RuHCl(PPh3)(3) (4a) yields RuH(sigma-OC6X5)(PPh3)(3) (X = F, 5(F)), the structure of which was confirmed by spectroscopic, microanalytical, and X-ray analysis. The analogous phenoxide complex (X = H, 5(H)) is known to be unstable toward sigma - pi isomerization, and reaction of phenoxide ion with 4a affords RuH(eta(5)-C6H5O)(PPh3)(2) (6a). We conclude that the driving force for isomerization in 51 is minimized by the electron deficiency of the perfluorophenoxide ring. In contrast, incorporation of the aryloxide entity within a chelating framework proves insufficient to inhibit isomerization. Thus, reaction of 4a or RuCl2(PPh3)(3) (4b) with the sodium salt of 2'-(diphenylphosphino)-1,1'-binaphthyl-2-ol (NaO-MOP) yields RuX(O-MOP)(PPh3) (7a, X = H; 7b, X = Cl). Detailed 1- and 2-D NMR analysis of 7b provides unequivocal evidence that the O-MOP ligand is bound to Ru in a sigma fashion through phosphorus and in a pi fashion via the aryloxide ring. The crystal structure of 5(F.)THF is reported.