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Showing 1 to 20 of 36 for “"diphosphine"”.
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Diphosphine Ligand Activation Studies with Organotransition-Metal Compounds
… 1,2-dichloroethane in the presence of the diphosphine ligands 2,3-bis(diphenylphosphino)maleic anhydride (bma) and 4,5-bis(diphenylphosphino)-4-cyclopenten-1,3-dione (bpcd) furnishes the new mixed-metal complexes CoRu(CO)4(μ -P-P)(μ -PPh2) [where P-P = bma (3); bpcd (6)], along with trace …
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Coordination Compounds of P,p,p',p'-Tetraethylethylene Diphosphine
Made available in DSpace on 2014-12-05T19:36:36Z (GMT). No. of bitstreams: 1 0020899.pdf: 5394234 bytes, checksum: d8827ec0842cca8b96fe645f82cb3d41 (MD5) Previous issue date: 1957
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Synthesis and characterization of diphosphine ligand substituted osmium and ruthenium clusters.
… activated cluster 1,2-Os3(CO)10(MeCN)2 by the diphosphine ligands dppbz proceeds rapidly at room temperature to furnish a mixture of bridging and chelating Os3(CO)10(dppbz) isomers and the ortho-metalated product HOs3(CO)9[μ-(PPh2)C=C{PPh(C6H4)}C4H4]. Thermolysis of the bridging isomer …
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THE SYNTHESIS, CHARACTERIZATION, AND REACTIONS OF DIPHOSPHINE MONOXIDE COMPLEXES OF SELECTED TRANSITION METALS
… of transition metal complexes containing diphosphine oxide, R(,2)P-P(O)PR(,2), and diphosphoxane, R(,2)P-O-PR(,2), ligands have been studied. The diphosphoxane tautomer, which is unstable in the free state has been observed to be stabilized by coordination to Mo(O) and Cu(I).</p><p>The …
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The effects of ancillary ligand properties on the reactions of rhodium diphosphine alkoxo alkene complexes
Rhodium diphosphine alkoxo alkene complexes were synthesized by the addition of unsaturated alcohols to rhodium diphosphine silylamido complexes at -78 °C. The alkoxo alkene complexes were characterized by NMR spectroscopy at 50 °C and allowed to react at either 35 °C or 70 °C. The reactions …
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Modeling The Active Site Of [NiFe]-Hydrogenase
… to isolate similar [(CO)3Fe(dithiolate)Ni(diphosphine)] complexes by reaction of the mononuclear NiII(diphosphine)(dithiolate) with Fe2(CO)9 were unsuccessful with this original route, except for [(CO)3Fe(pdt)Ni(dppe)]. The reaction of FeI2(CO)4 followed by reduction with cobaltocene with …
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Synthetic and NMR studies of polyorganophosphorus compounds.
A new five-membered cyclic tertiary diphosphine has been synthesised, PhPCH(=CH2)PPhCH2CH2 (X). Cis and trans isomers were observed; and the trans isomer (Xb) has been isolated and fully characterised by P-31, H-1 and C-13 n.m.r. spectroscopy.
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Substitution chemistry of the cobalt complexes RCCo3(CO)9 (R = H, CHO) with the diphosphine ligand: 4,5-bis(diphenylphosphino)-4-cyclopenten-1,3-dione (bpcd). Syntheses, X-ray structures and reactivity.
… = CHO (1), H (3)} and the redox-active diphosphine ligand 4,5-bis(diphenylphosphino)-4-cyclopenten-1,3- dione (bpcd) leads to the replacement of two CO groups and formation of RCCo3(CO)7(bpcd) {R = CHO (2), H (4)}. Clusters 2 and 4 are thermally unstable and readily transform into the …
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Small molecule mimics of hydrogenase enzymes: synthesis, protonation, and electrocatalysis
… of a new synthesis of complexes of the type (diphosphine)Ni(xdt)(CO)3, in which Fe(CO)4I2 condensed with Ni(xdt)(diphosphine), forming a NiIIFeII -iodide intermediate, which is then reduced to form the neutral NiFe complex. With this new synthetic method in hand, we synthesized of new …
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Synthesis and characterization of ruthenium complexes with (N-N)(P-P) and (N-P)2 donor sets
… complexes is detailed. Three bidentate diphosphine ligands (dppe, dppb and dppf) and one diimine ligand (tert-Bu-bpy) were selected for this study as the diphosphine and diimine ligands, respectively. Ruthenium halide and mono-alkynyl complexes were obtained successfully. Their optical, …
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Synthesis and characterization of ruthenium complexes with (N-N)(P-P) and (N-P)2 donor sets
… complexes is detailed. Three bidentate diphosphine ligands (dppe, dppb and dppf) and one diimine ligand (tert-Bu-bpy) were selected for this study as the diphosphine and diimine ligands, respectively. Ruthenium halide and mono-alkynyl complexes were obtained successfully. Their optical, …
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Studies of the Coordination Chemistry and Catalytic Activity of Rhodium and Ruthenium N-Heterocyclic Carbene Complexes
… by addition of benzimidazoles to [Cl2Ru(diphosphine)]. Although these attempts were unsuccessful, a large number of complexes of the formula [Cl2Ru(diphosphine)(-N3-benzimidazole)2] were synthesized and proved to be effective catalysts for the chemoselective hydrogenation of ketones …
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Carbon dioxide utilization : from fundamental reactivity to catalysis using transition metals supported by macrocyclic diphosphines
… investigated. A family of cis-macrocyclic diphosphines was prepared in just three steps from white phosphorus and commercial materials using a modular synthetic approach. Alkylation of bicyclic diphosphane P₂dmb₂ produced phosphino-phosphonium salts [RP₂dmb₂]X, where R is methyl, benzyl, …
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Biologically-Inspired Bimetallic Complexes for the Activation of Small Molecules
… Fe-only hydrogenase models with D2. The diphosphine diruthenium complex Ru2(S2C3H6)(CO)4(PCy 3)2 oxidatively adds dihydrogen to produce the dihydride Ru2(S2C3H6)(mu-H)(H)(CO) 3(PCy3)2, the first example of the homolytic activation of dihydrogen by a synthetic Fe-only hydrogenase model. …
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Part I Synthesis and molecular Assemblies of d10 metal complexes bearing 9, 10-disubstituted anthracene ligand Part II Synthesis and spectroscopic studies of heterobimetallic platinum(II)-acetylide and platinum(0)-acetylene complexes
… of crystal structures of a series of gold(I) diphosphine complexes formulated as (I?-PAnP)(AuX)2 (PAnP: 9, 10-bis-diphenylphosphinoanthracene). First examples of Au-X-Ag halonium species were discovered in the reaction of (I?-PAnP)(AuCl)2 or (I?-PAnP)(AuBr)2 with AgSbF6. Coordination chemistry …
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Synthesis and Coordination Chemistry of Novel Water Soluble Diphosphines: Application to Ruthenium Catalyzed Aqueous Nitrile Hydration
… two novel 1,3,5-triaza-7-phosphaadamantane (PTA) diphosphine derivatives. Preparation involved the addition of chlorophosphines to lithiated PTA (PTA-Li). Two novel bicyclic diamino chlorophosphines were isolated for the synthetic approach. The chlorophosphine ClP(NiPr)2(CH2)2 (3) is previously …
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Reversible binding of dihydrogen to dinuclear ruthenium complexes containing chelating diphosphines
… has been extended to include compounds of the diphosphine 1,4-bis(dicyclohexylphosphino)butane (P-P = DCYPB). The complexes are generally prepared by the reaction of RuCl₃(PR₃)₂(DMA)‧DMA, R = phenyl or p-tolyl, DMA = N,N-dimethylacetamide, with one equilvalent of the appropriate diphosphine. …
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Synthesis of redox-active ligands and their use in hydrogenase modeling
… 4 describes the synthesis of Fe(dithiolate)(diphosphine)(CO)2 complexes as building blocks to yield bimetallic model systems. When models are constructed with non-rigid disphosphine ligands, the synthesis and isolation of FeFe systems proves challenging. However, the comproportionation …
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Hydrogen Production From Model Complexes of the [iron-Iron]- and [nickel-Iron]-Hydrogenase Active Sites
… 3 subunit. Further derivatives altering the Ni(diphosphine)(SR) 2 subunit have been achieved through an alternative synthetic procedure to the Ni(I)Fe(I) complex. All nickel-iron hydrides investigated are active catalysts for the reduction of protons. As the catalytic mechanism of …
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