83298-09-3Relevant academic research and scientific papers
Flexible syntheses of tripodal phosphine ligands 1,1,2- tris(diarylphosphino)ethane and their ruthenium η5-C 5Me5 complexes
Sues, Peter E.,Lough, Alan J.,Morris, Robert H.
, p. 6589 - 6594 (2012/11/07)
A series of four tripodal polyphosphine ligands (PAr2) 2CHCH2PAr2 (1a-d) were synthesized and coordinated to ruthenium to produce the complexes [Ru(η5-C 5Me5)((PAr2)2CHCH 2PAr2)]PF6 (2a-d) (Ar = phenyl (a), p-tolyl (b), o-tolyl (c), m-xylyl (d)). The 1,1,2-tris(diarylphosphino)ethane compounds were generated in a novel trisubstitution reaction of diarylphosphorylacetaldehyde diethyl acetal, a useful synthetic precursor that was used previously for the synthesis of phosphonium dimers. The tridentate ligands were subsequently combined with the ruthenium(II) precursor Ru(η5-C5Me5)(1,5-COD)Cl, in order to probe the coordination geometry of 1a-d. The resulting complexes 2a-d displayed piano-stool type structures where the phosphine ligands were coordinated in a fac geometry. Despite the large steric bulk of the ligands, as well as the ring strain caused by the formation of a four-membered ring and two five-membered rings with the ruthenium center, complexes 2a-d were quite stable. The ruthenium salts were air and moisture stable and did not react with CO, H2, or NaBH4, even at elevated temperatures.
Complexes of 1,1,2-Tris(diphenylphosphino)ethane with Group 6 Metal Carbonyls
Bookham, Jonathan L.,McFarlane, William,Colquhoun, Ian J.
, p. 503 - 508 (2007/10/02)
The preparation of (Ph2P)2CHCH2PPh2 (tppe) and its reactions with (M=Cr, Mo, or W) are described.In the 1:1 complexes (n=3-5) there are five possible modes of co-ordination, and all have been identified although indirect synthetic
Ambiedentate Poly(diphenylphosphino)ethanes and -ethenes
Schmidbaur, Hubert,Paschalidis, Christos,Reber, Gabriele,Mueller, Gerhard
, p. 1241 - 1246 (2007/10/02)
Base-catalyzed hydrophosphorylation of CH2=C(PPh2)2 (1) using Ph2PH affords 1,1,2-tris(diphenylphosphino)ethane (2) in high yield.This product is converted into the trisulfide 3 when treated with sulfur, and into a monoquaternary salt 4, when treated with MeI.The onium center appears at one of the two geminal phosphine groups.Treatment of 4 with KH in tetrahydrofuran yields the corresponding ylide 5 as an unstable product.Excess MeI reagent causes P-C cleavage in 1 or 4, but only I2 (6) was identified among several products. - Base-catalyzed addition of Ph2PH to Ph2PCCPPh2 affords tris(diphenylphosphino)ethene (7) whose molecular structure has been determined by X-ray crystallography.The conformation is similar to that in the reference compounds 1 and cis-Ph2P-CH=CH-PPh2.Judged from its only minor distortions, the C=C unit in 7 is not severely affected by either steric or electronic effects of the Ph2P groups.The hydrophosphorylation of Ph2PCCPPh2 with Ph2PH yields yellow 1,2,3,4-tetrakis(diphenylphosphino)-1,3-butadiene (8) as a by-product.
New Polyphosphorus Ligands: Addition Reactions of 1,1-Bisdiphenylphosphinoethene
Bookham, Jonathan L.,McFarlane, William,Colquhoun, Ian J.
, p. 1041 - 1042 (2007/10/02)
The reactivity of the double bond adjacent to the geminal diphenylphosphino groups of (Ph2P)2C=CH2 facilitates the addition of species with one or more P-H bonds to provide a convenient high-yielding route to a range of new poly- and ambi-dentate ligands
Transition Metal Complexes of Instable Ylides, VIII. Synthesis and Structure of a Novel Cage Compound Containing an Ylidic Tripod Ligand
Weber, Lothar,Wewers, Dietmar,Boese, Roland
, p. 3570 - 3578 (2007/10/02)
The sulfur ylide complex (CO)5Cr (3) reacts with 1,1,2-Tris(diphenylphosphino)ethane (4) to yield the novel tripod complex 8, the cage structure of which is elucidated by spectroscopic data and X-ray structure analysis.The Cr(CO)3 fragment of this complex is connected to the ligand via an ylidic and two phosphane centers.
