5274-51-1Relevant academic research and scientific papers
Platinum complexes of a borane-Appended Analogue of 1,1'-Bis(diphenylphosphino)ferrocene: Flexible borane coordination modes and in situ vinylborane formation
Cowie, Bradley E.,Emslie, David J.H.
, p. 16899 - 16912 (2015/02/19)
A bis(phosphine)borane ambiphilic ligand, [Fe(h5-C5H4PPh2)(h5-C5H4PtBu{C6H4 (BPh2)-ortho})] (FcPPB), in which the borane occupies a terminal posi
Dimerization of ethylene by palladium complexes containing bidentate trifluoroborate-functionalized phosphine ligands
Gott, Andrew L.,Piers, Warren E.,Dutton, Jason L.,McDonald, Robert,Parvez, Masood
experimental part, p. 4236 - 4249 (2011/10/03)
As an alternative to the widely reported phosphine-sulfonate ligand system, a series of potassium aryltrifluoroborate-functionalized phosphine ligands and zwitterionic phosphonium salts were prepared and structurally characterized. The phosphine ligands formed complexes of the general formula [κ2- (P,F)RPdClMe] (where R = Ph, 2-OMe-Ph) when reacted with PdClMe(COD); however, cleavage of the chloride ligand proved problematic. Reaction of the phosphonium salts with PdMe2(tmeda) yield complexes of the general type [κ-(P)RPdMe(tmeda)], which react with pyridine derivatives to displace tmeda. Manipulation of the steric bulk of the pyridine ligands affords some control over the coordination mode of the fluoroborate phosphine, yielding facile access to complexes of the general type [κ2-(P, F)RPdMe(lutidine)]. Investigations into the insertion chemistry of the palladium methyl moiety with simple small molecules revealed that the release of the lutidine ligand is slow and that insertion of ethylene occurs in a very slow manner; this is attributed to the relative electron deficiency of the aryltrifluoroborate moiety as compared to sulfonate. The palladium lutidine complexes slowly dimerize ethylene to a mixture of propene and butenes.
Novel palladium complexes employing mixed phosphine phosphonates and phosphine phosphinates as anionic chelating [P,O] ligands
Reisinger, Corinna M.,Nowack, Ruediger J.,Volkmer, Dirk,Rieger, Bernhard
, p. 272 - 278 (2007/10/03)
A route to various substituted phosphine phosphonic acid compounds of the general form Ar2PC6H4PO(OH)2 (Ar = Ph, o-MeC6H4, o-MeOC6H4) has been investigated. These comp
Asymmetric hydrogenation of ketones using a ruthenium(II) catalyst containing BINOL-derived monodonor phosphorus-donor ligands
Xu, Yingjian,Alcock, Nat W.,Clarkson, Guy J.,Docherty, Gordon,Woodward, Gary,Wills, Martin
, p. 4105 - 4107 (2007/10/03)
(Chemical Equation Presented) A series of ruthenium(II) complexes containing BINOL-based monodonor phosphorus ligands have been prepared and applied to the asymmetric catalysis of the hydrogenation of aryl/alkyl ketones. The best ligands for this application are those which contain an aromatic groups with either a methoxide or bromide on the ortho position. Using these ligands, alcohols with ee's of up to 99% are formed.
Carbonylvanadium, -manganese and -molybdenum Complexes of the Ligands o-C6H4EPh2(E'Ph2) (E, E' = P, As, Sb, Bi) and cis-Ph2PCH=CHPPh2
Talay, Ridvan,Rehder, Dieter
, p. 451 - 462 (2007/10/02)
The photo-induced reaction between the complexes (1), η5-C5H5V(CO)4 (2), η5-C5H5Mn(CO)3 (3) or η5-C5H5Mo(CO)3CH3 (4) and the ligands o-C6H4EPh2(E'Ph2) (E = E' = P: a; E = P, E' = As: b; E = E' = As: c; E = P, E' = Sb: d; E = P, E' = Bi: e; E = As, E' = Sb: f) and cis-Ph2PCH=CHPPh2 (g), L, yields - depending on the steric requirement of L - the compounds L ( = cis-V(CO)4(-), cis-CpV(CO)2, CpMn(CO), CpMo(CO)CH3; L = a, b, c, g), L ( = V(CO)5(-), L = d; = CpV(CO)3, L = d, e; = CpMn(CO)2, L = e) or mixtures of L and L (, = V(CO)4,5, L = e, f; , = CpV(CO)2,3, L = f).In the mono-substituted species L coordination (as indicated by the 51V NMR spectra) occurs through EPh2 and E'Ph2, which is explained by a reaction path via a lable chelate 5-ring structure.Shielding of the 51V nucleus decreases in the order g > SbPh2 > PPh2 > AsPh2 > BiPh2 (derivatives of 1) and g > SbPh2 > PPh2 > BiPh2 > AsPh2 (derivatives of 2), and is smaller in the rigid chelates incorporating the o-phenylene ligands than in the more flexible structures of phospha- and arsabutane complexes.This fact is discussed in terms of hindered ?-overlap due to distortion of the EVE angle, which also results in an increase of CO valence force constants in rigid chelates. 31P coordination shifts increase according to dppe a g and arphos b (dppe = Ph2P(CH2)2PPh2, arphos = Ph2As(CH2)2PPh2). 31P NMR spectra of the molybdenum complexes suggest that the basic geometry for 4a and 4b likely is tetragonal pyramidal, while the preferred structure for 4g appears to be the trigonal bipyramid with the ligand in equatorial positions.The crystal and molecular structure of 1a is reported.The complex crystallizes in the space group C2/c (a = 2196.0, b = 1080.1, c = 2022.7 pm, β = 124.6 deg).The most striking result is the small PVP angle of 80.8 (0.2) deg.Optimized methods for the synthesis of the ligands a-f are described; the ligands are characterized by their mass spectra. - Keywords: Carbonylphosphinevanadium, Vanadium-NMR; Phosphorus-NMR
