869014-01-7Relevant articles and documents
Platinum complexes of rigid bidentate phosphine ligands in the hydroformylation of 1-octene
Van Der Vlugt, Jarl Ivar,Van Duren, Ruben,Batema, Guido D.,Den Heeten, Rene,Meetsma, Auke,Fraanje, Jan,Goubitz, Kees,Kamer, Paul C. J.,Van Leeuwen, Piet W. N. M.,Vogt, Dieter
, p. 5377 - 5382 (2005)
The synthesis of the two novel diphosphine compounds 1,2-bis(3- (diphenylphosphino)-4-methoxyphenyl)benzene (1; Terphos), and 1,2-bis(2-diphenylphosphino)benzene (2), both derived from a terphenyl backbone structure, are described. Straightforward synthetic routes have been employed to obtain these ligands in good yields from cheap starting materials. The coordination of ligands 1 and 2 with PtCl2(cod) has been studied by NMR spectroscopy, and the X-ray crystal structures of the resulting complexes 4 and 5 were determined. The 31P NMR spectra of the mononuclear products demonstrate solely cis coordination for both bidentate ligands, with corresponding coupling constants JPt-p of 3810 Hz (cis-[PtCl 2(1)], complex 4) and 3712 Hz (cis-[PtCl2(2)], 5). The bite angles P1-Pt-P2 were 98.74 and 105.89°, respectively, in the distorted square-planar complexes. The new diphosphines have been applied in the platinum/tin-catalyzed hydroformylation of 1-octene, and both ligands give active and selective platinum catalysts.
