Relevant bibliographies by topics / Long chain phosphines

Academic literature on the topic 'Long chain phosphines'

Author: Grafiati
Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Long chain phosphines"

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Petrucci, Maria G. L., and Ashok K. Kakkar. "Heterogenizing Homogeneous Catalysis Using Molecular Self-Assembly of Long Alkane Chain Phosphines Bound to Rh(I) Complexes." Chemistry of Materials 11, no. 2 (February 1999): 269–76. http://dx.doi.org/10.1021/cm9804968.

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Demizu, Kei, Hiroyuki Ishigaki, Hideo Kakutani, and Fukuzo Kobayashi. "The Effect of Trialkyl Phosphites and Other Oil Additives on the Boundary Lubrication of Ceramics: Friction of Silicon-Based Ceramics." Journal of Tribology 114, no. 4 (October 1, 1992): 653–58. http://dx.doi.org/10.1115/1.2920932.

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In order to examine the fundamental boundary lubrication properties of ceramics, reciprocating friction experiments of silicon based ceramics such as silicon carbide and silicon nitride were conducted with trialkyl phosphites and other oil additives. When ceramics were slid against ceramics, trialkyl phosphites with long carbon chains reduced the friction of silicon nitride markedly; the friction coefficients decreased with an increase in the carbon chain length. Other oil additives, however, did not greatly affect the friction. When ceramics were slid against metals, additives containing chlorine or sulfur increased friction of certain sliding couples. On the other hand, a trialkyl phosphite reduced friction and the friction coefficients increased with an increase in the maximum Hertzian contact pressure.
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3

Il’in, Anton, Arthur Gubaev, Anna Antonova, Arthur Khannanov, and Vladimir Galkin. "Phosphine catalyzed addition of long-chain dialkyl phosphites to electron-deficient alkenes." Synthetic Communications 50, no. 21 (July 30, 2020): 3287–97. http://dx.doi.org/10.1080/00397911.2020.1799015.

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4

Corfield, Peter W. R. "Crystal structure of poly[(μ3-thiocyanato-κ3N:S:S)(trimethylphosphine sulfide-κS)copper(I)]." Acta Crystallographica Section E Structure Reports Online 70, no. 11 (October 4, 2014): 281–85. http://dx.doi.org/10.1107/s1600536814021412.

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In the title compound, [Cu(NCS)(C3H9PS)]n, the thiocyanate ions bind the CuIatoms covalently, forming infinite –Cu—SCN—Cu– chains parallel to theaaxis. Each CuIatom is also coordinated to a trimethylphosphine sulfide groupviaa Cu—S bond. Two crystallographically independent chains propagate in opposite directions, and are held together in a ribbon arrangement by long bonds between CuIatoms in the first chain and thiocyanate S atoms in the second, with Cu—S = 2.621 (1) Å. The geometry around the CuIatoms in the first chain is distorted tetrahedral, with angles involving the long Cu—S bond much less than ideal, and the S—Cu—N angle between the phosphine sulfide S atom and the thiocyanate N atom opening out to 133.19 (9)°. Each CuIatom in the second chain appears to be disordered between two positions 0.524 (4) Å apart, with occupancy factors of 0.647 (6) and 0.353 (6). The CuIatom in the major site is in a distorted trigonal–planar configuration, with the S—Cu—N angle between the phosphine sulfide and the thiocyanate N atom again opened out, to 137.01 (15)°. The CuIatom in the minor site, however, forms in addition a long bond [Cu—S = 2.702 (5) Å] to the phosphine sulfide of the first chain, not the thiocyanate S atom, to provide a further link between the chains.
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Soulivong, Daravong, Dominique Matt, Jack Harrowfield, and Loïc Toupet. "A Long-Chain Phosphine Designed as a Metallomesogen Generator—Synthesis and Coordination Properties." Australian Journal of Chemistry 57, no. 2 (2004): 157. http://dx.doi.org/10.1071/ch03264.

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The long-chain phosphine Me2PC≡C(p-C6H4CHNR C8) [L; RC8 = p-C6H4OC(O)(p-C6H4OC8H17)] has been prepared in two steps starting from 4-ethynylbenzaldehyde (1): (a) condensation of 1 with H2NRC8 (2) afforded the corresponding imine 3 (yield 86%) which displays liquid-crystalline behaviour; (b) deprotonation of 3 with LiNPri2 and subsequent reaction with Me2PCl gave a mixture of the phosphine–alkyne L and the precursor 3 (L : 3 = 60 : 40). Reaction of this mixture with [PtCl2(PhCN)2] produced cis-[PtCl2L2] (4) and provided an efficient means of separating the phosphine from 3. The crystal structure of imine 3 has been determined by single-crystal X-ray diffraction and analysis of this structure provides a basis for understanding both the mesogenic character of 3 and its absence in the complex 4.
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Qi, LIN, FU Hai-Yan, XUE Fang, YUAN Mao-Lin, CHEN Hua, and LI Xian-Jun. "Hydroformylation of Long-chain Olefins Catalyzed by Rhodium-Phosphine Complexes in New Ionic Liquids." Acta Physico-Chimica Sinica 22, no. 04 (2006): 465–69. http://dx.doi.org/10.3866/pku.whxb20060415.

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Romanova, Irina P., Andrei V. Bogdanov, Inessa A. Izdelieva, Vasily A. Trukhanov, Gulnara R. Shaikhutdinova, Dmitry G. Yakhvarov, Shamil K. Latypov, et al. "Novel indolin-2-one-substituted methanofullerenes bearing long n-alkyl chains: synthesis and application in bulk-heterojunction solar cells." Beilstein Journal of Organic Chemistry 10 (May 14, 2014): 1121–28. http://dx.doi.org/10.3762/bjoc.10.111.

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An easy, high-yield and atom-economic procedure of a C60 fullerene modification using a reaction of fullerene C60 with N-alkylisatins in the presence of tris(diethylamino)phosphine to form novel long-chain alkylindolinone-substituted methanofullerenes (AIMs) is described. Optical absorption, electrochemical properties and solubility of AIMs were studied. Poly(3-hexylthiophene-2,5-diyl) (P3HT)/AIMs solar cells were fabricated and the effect of the AIM alkyl chain length and the P3HT:AIM ratio on the solar cell performance was studied. The power conversion efficiencies of about 2% were measured in the P3HT/AIM devices with 1:0.4 P3HT:AIM weight ratio for the AIMs with hexadecyl and dodecyl substituents. From the optical and AFM data, we suggested that the AIMs, in contrast to [6,6]-phenyl-C61-butyric acid methyl ester (PCBM), do not disturb the P3HT crystalline domains. Moreover, the more soluble AIMs do not show a better miscibility with the P3HT crystalline phase.
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Fu, Haiyan, Min Li, Jun Chen, Ruimin Zhang, Weidong Jiang, Maolin Yuan, Hua Chen, and Xianjun Li. "Application of a new amphiphilic phosphine in the aqueous biphasic catalytic hydroformylation of long chain olefins." Journal of Molecular Catalysis A: Chemical 292, no. 1-2 (September 2008): 21–27. http://dx.doi.org/10.1016/j.molcata.2008.06.005.

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Fetouaki, Rachid, Annekathrin Seifert, Mona Bogza, Thomas Oeser, and Janet Blümel. "Synthesis, immobilization, and solid-state NMR of new phosphine linkers with long alkyl chains." Inorganica Chimica Acta 359, no. 15 (December 2006): 4865–73. http://dx.doi.org/10.1016/j.ica.2006.07.094.

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She, Xing-jin, Qiang Zhang, Cai-Feng Wang, and Su Chen. "New insights into the phosphine-free synthesis of ultrasmall Cu2−xSe nanocrystals at the liquid–liquid interface." RSC Advances 5, no. 110 (2015): 90705–11. http://dx.doi.org/10.1039/c5ra18313h.

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A liquid–liquid interfacial strategy to prepare ultra small (<5 nm) colloidal Cu2−​xSe NCs with blue-fluorescence, noncaustic and environmentally friendly NH4SCN replaces the long-chain organic ligands for fabrication of NC-sensitized solar.
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Dissertations / Theses on the topic "Long chain phosphines"

1

Du, Toit Judith G. O. "Use of water-soluble phosphine ligands in heterogeneous hydroformylation catalysis : application to long-chain 1-alkenes." Master's thesis, University of Cape Town, 1994. http://hdl.handle.net/11427/22055.

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The two-phase rhodium-tri(m-sulfonatophenyl)phosphine (Rh-TPPTS) system for the hydroformylation of 1-octene, 1-decene, and 1-dodecene to the corresponding aldehydes, has been investigated. Due to the two distinct phases - the catalytic species in the aqueous phase and the products and reactants in the organic phase - the separation of the catalyst was easily facilitated. A comparison was made of the activity, selectivity towards linear aldehydes, and catalyst lifetime of two systems where i) the active catalytic species were generated in situ from rhodium trichloride (RhCl₃.3H₂O) and excess phosphine ligand (TPPTS) under mild hydroformylation conditions (5 MPa H₂/CO (1:1); 100 °C); and ii) where the rhodium(I) complex, RhH(CO)(TPPTS)₃ is used as the catalyst precursor. The former system was found to be superior in activity and selectivity to that of the latter, achieving fairly high conversions of ca. 60% for the hydroformylation of 1-octene, with n:iso ratios of up to 16:1 for a catalyst composition a Rh:P ratio of 1:30. Unfortunately low conversions of ca. 10% for the hydroformylation of 1-decene and ca. 4% for that of 1-dodecene resulted under the same conditions. While the reasons for the drastic decrease in conversion for C₁₀ and C₁₂ alkenes is not completely clear, this poor conversion is attributed to the extremely low solubility of the long-chain 1-alkenes in the aqueous phase. Under certain optimum conditions (Rh:P ≥ l :20), virtually no leeching of rhodium into the organic phase was detected. A ³¹P NMR spectroscopic study was undertaken in an attempt to ascertain the nature and distribution of rhodium tertiary-phosphine complexes in the aqueous phase before and after the mixture was subjected to standard hydroformylation conditions.
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Paige, Danny R. "The synthesis, co-ordination chemistry and catalytic applications of phosphine ligands containing long-chain perfluoro-alkyl groups." Thesis, University of Leicester, 1998. http://hdl.handle.net/2381/30022.

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A review is presented of the use of catalytic liquid-liquid biphase systems containing a perfluorinated phase, commonly referred to as 'fluorous biphase systems' or F.B.S. catalysis. The phosphines PPh(3-x)(C2H4C6F13), PPh(3-x)(C6H4-p-C6F13)x and PPh(3-x)(C6H4-m-C6F13), where x = 1, 2 and 3, have been synthesised and fully characterised by 1H, 19F and 31P NMR spectroscopy, mass spectroscopy and elemental analysis, with a view to assessing their potential for use in F.B.S. catalysis. The crystal structures of O=P(C6H4-m-C6F13) and Cl-P(C6H4-o-C6F13)2 are also reported. The synthetic route to P(C2H4C6F13)3 represents an improvement on the literature preparation. These phosphines have been reacted with a variety of transition metals to form complexes of the type cis- and trans-[MCl2L2] (M = Pt, Pd), trans-[MCl(CO)L2] (M = Rh, Ir), [RhCp*Cl2L] and [RhClL3]. These complexes have all been isolated and fully characterised, except for the complexes [RhClL3], which have not been isolated, but whose solution chemistry is described. The crystal structures of the complexes cis-[PtCl2(PPh2C2H4C6F13)2] and trans-[RhCl(CO)(P{C2H4C6F13}3)2] are also reported. All of the complexes described above have been extensively investigated using a variety of analytical techniques including 31P, 19F and 1H NMR spectroscopy, mass spectroscopy and IR spectroscopy. The results from an EXAFS spectroscopic study on some of these complexes is included as an appendix to this work. The electronic and steric influence of the perfluorinated chains on the reactivity and behaviour of both the free phosphines and the metal complexes has been evaluated from the nature of the products isolated, from a comparison of their spectroscopic and structural data with those for related metal-phosphine complexes and, for the complexes trans-[IrCl(CO)L2], from a kinetic study on the rate of O2 addition. Preliminary catalytic hydrogenation and hydroformylation studies have been carried out using the complexes [RhClL3] and [RhH(CO)L3] respectively, where L = phosphine. These catalytic species were gathered in situ and the study involved the use of F.B.S. catalysis. The effect of the variation of the phosphine type, the solvents and the reaction conditions, has been examined in terms of reaction rate, product selectivity and product/catalyst separation. The potential of F.B.S. catalysis using phosphine ligands has been assessed.
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3

Obrecht, Lorenz. "Artificial metalloenzymes in catalysis." Thesis, University of St Andrews, 2015. http://hdl.handle.net/10023/7248.

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This thesis describes the synthesis, characterisation and application of artificial metalloenzymes as catalysts. The focus was on two mutants of SCP-2L (SCP-2L A100C and SCP-2L V83C) both of which possess a hydrophobic tunnel in which apolar substrates can accumulate. The crystal structure of SCP-2L A100C was determined and discussed with a special emphasis on its hydrophobic tunnel. The SCP-2L mutants were covalently modified at their unique cysteine with two different N-ligands (phenanthroline or dipicolylamine based) or three different phosphine ligands (all based on triphenylphosphine) in order to increase their binding capabilities towards metals. The metal binding capabilities of these artificial proteins towards different transition metals was determined. Phenanthroline modified SCP-2L was found to be a promising scaffold for Pd(II)-, Cu(II)-, Ni(II)- and Co(II)-enzymes while dipicolylamine-modified SCP-2L was found to be a promising scaffold for Pd(II)-enzymes. The rhodium binding capacity of two additional phosphine modified protein scaffolds was also investigated. Promising scaffolds for Rh(I)- and Ir(I)-enzymes were identified. Rh-enzymes of the phosphine modified proteins were tested in the aqueous-organic biphasic hydroformylation of linear long chain 1-alkenes and compared to the Rh/TPPTS reference system. Some Rh-enzymes were found to be several orders of magnitude more active than the model system while yielding comparable selectivities. The reason for this remarkable reactivity increase could not be fully elucidated but several potential modes of action could be excluded. Cu-, Co-, and Ni-enzymes of N-ligand modified SCP-2L A100C were tested in the asymmetric Diels-Alder reaction between cyclopentadiene and trans-azachalcone. A promising 29% ee for the exo-product was found for the phenanthroline modified protein in the presence of nickel. Further improvement of these catalyst systems by chemical means (e.g. optimisation of ligand structure) and bio-molecular tools (e.g. optimisation of protein environment) can lead to even more active and (enantio)selective catalysts in the future.
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