2501-94-2Relevant academic research and scientific papers
Synthesis and characterization of bridged dimeric and trimeric Group 13/15 complexes containing primary phosphidotBu)PH>- and arsenido tBu)AsH>- units
Atwood, David A.,Cowley, Alan H.,Harris, Paul R.,Jones, Richard A.,Koschmieder, Stefan U.,Nunn, Christine M.
, p. 61 - 67 (1993)
Addition of the primary phosphine tBuPH2 or the primary arsine tBuAsH2 to tBu3M (M = Ga, Al) followed by heating or photolysis affords the complexes tBu2M(μ-E(tBu)H)>n (1; M = Ga, E = P; n = 2; 2, M = Al, E = P, n = 2; 3, M = Ga, E = As, n = 3; 4, M = Al, E = As, n = 3).For each compound, the degree of association was assessed on the basis of 1H, 31P, 13C NMR and mass spectroscopy.The anti-isomer of 1 (1a) was also characterized by X-ray crystallography.Crystal data for 1a; C24H56Ga2P2, monoclinic, space group C2/m, a 17.124(7), b 11.755(7), c 8.700(3) Angstroem, V 1561.94(15) Angstroem3, Z = 4, Dcalc 1.157 g cm-3, μ(MoKα) 18.3 cm-1.A total of 1501 unique reflections was measured over the range 3.0 2θ 50.0 deg (θ-2θ scan mode) and 1263 of these with I above 3?(I) were used in the refinement to afford final R and Rw values of 0.059 and 0.070, respectively.
LITHIUM ALKYL ALUMINATES AS ALKYL TRANSFER REAGENTS
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Paragraph 0187-0190, (2022/02/27)
The invention relates to lithium alkyl aluminates according to the general formula Li[AlR4] and to a method for preparing same, starting from LiAlH4 and RLi in an aprotic solvent. The invention also relates to compounds according to the general formula Li[AlR4] which can be obtained using the claimed method, and to the use thereof. The invention also relates to the use of a lithium alkyl aluminate Li[AlR4] as a transfer reagent for transferring at least one radical R to an element halide or metal halide and to a method for transferring at least one radical R to a compound E(X)q for preparing a compound according to the general formula E(X)q-pRp, where E=aluminium, gallium, indium, thallium, germanium, tin, lead, antimony, bismuth, zinc, cadmium, mercury, or phosphorus, X=halogen, q=2, 3 or 4, and p=1, 2, 3 or 4. The invention also relates to compounds which can be obtained using such a method, to the use thereof, and to a substrate which has an aluminium layer or a layer containing aluminium on one surface.
A Simple Strategy for the Preparation of P-Chirogenic Trost Ligands with Different Absolute Configurations
Du, Peng,Lu, Xiao-Bing
supporting information, (2020/08/05)
P-chirogenic compounds are useful ligands and organocatalysts in asymmetric synthesis. However, the lack of preparative methods and their configurational instability have significantly hampered their development. Herein, we report a simple strategy for the preparation of enantiomerically pure P,C-chirogenic diphosphines. Amidation of the borane adducts of rac-phosphinobenzoic acids with enantiomerically pure trans-1,2-diaminocyclohexane afforded a 1:2:1 mixture of the diastereomers (C*,C*,Rp,Rp), (C*,C*,Rp,Sp), and (C*,C*,Sp,Sp), which were separated by column chromatography on silica gel. The prepared (C*,C*,Rp,Rp) and (C*,C*,Sp,Sp) stereoisomers were identical to those obtained from the enantiopure phosphines, which were synthesized by a multi-step route using chiral auxiliaries. Hence, this simple, short and convenient route towards P,C-chirogenic diphosphines obviates the use of chiral auxiliaries and enables the access to diphosphines with differently configured P-stereocenters.
NOVEL VINYL PHOSPHINES AND PHOTO-INITIATORS OBTAINABLE THEREFROM
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Page/Page column 47, (2019/10/04)
The present invention relates to a highly efficient process to prepare alkyl and vinyl phosphines which are useful as starting materials for novel bisacylphosphine oxides, bisacylphosphinic acids, salts, and derivatives thereof each bearing a vinyl functionality bound to the phosphorous atom as well as a versatile process for the preparation of the latter.
Exploring the Reactivity of Donor-Stabilized Phosphenium Cations: Lewis Acid-Catalyzed Reduction of Chlorophosphanes by Silanes
Pearce, Kyle G.,Borys, Andryj M.,Clark, Ewan R.,Shepherd, Helena J.
supporting information, p. 11530 - 11536 (2018/09/21)
Phosphane-stabilized phosphenium cations react with silanes to effect either reduction to primary or secondary phosphanes, or formation of P-P bonded species depending upon counteranion. This operates for in situ generated phosphenium cations, allowing catalytic reduction of P(III)-Cl bonds in the absence of strong reducing agents. Anion and substituent dependence studies have allowed insight into the competing mechanisms involved.
Rhodium(I)-Catalyzed Intermolecular Hydroacylation of α-Keto Amides and Isatins with Non-Chelating Aldehydes
Kou, Kevin G. M.,Longobardi, Lauren E.,Dong, Vy M.
supporting information, p. 2233 - 2237 (2015/07/27)
The application of the bidentate, electron-rich bisphosphine ligand, 1,3-bis(dicyclohexyl)phosphine-propane (dcpp), in rhodium(I)-catalyzed intermolecular ketone hydroacylation is herein described. Isatins and α-keto amides are shown to undergo hydroacylation with a variety of non-chelating linear and branched aliphatic aldehydes. Also reported is the synthesis of new bidentate chiral phosphine ligands, and their application in hydroacylation is discussed.
Alkyl group VA metal compounds
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Page 6, (2008/06/13)
A method of preparing Group VA organometal compounds in high yield and high purity by the reaction of a Grignard reagent with a Group VA metal halide in certain ethereal solvents is provided. A method of preparing Group VA organometal hydrides is also provided.
Practical P-chiral phosphane ligand for Rh-catalyzed asymmetric hydrogenation
Liu, Duan,Zhang, Xumu
, p. 646 - 649 (2007/10/03)
A highly electron-donating and conformationally rigid P-chiral bis(trialkylphospholane) ligand 2 (DuanPhos) has been prepared in both enantiomeric forms through a concise synthesis. Rh-2 complex has exhibited remarkably high enantio-selectivities (up to >99% ee) and reactivities (up to 10,000 TON) for the hydrogenation of a wide variety of functionalized prochiral alkenes (5 different types), which provides a very practical catalytic system for the preparation of various synthetically useful chiral compounds. Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005.
Highly pure monoalkylphosphine and method for producing same
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, (2008/06/13)
A highly pure monoalkylphosphine which is useful as a starting material for producing a compound semiconductor, and a method for producing same in high yield are provided. A highly pure monoalkylphosphine represented by the general formula RPH2 (wherein R is an alkyl group having 1 to 8 carbon atoms) has a purity of not less than five nines, and is substantially free of sulfur and silica. In the method of producing said highly pure monoalkylphosphine, anhydrous hydrofluoric acid is used as a catalyst for a reaction between phosphine and an alkene, and the reaction is carried out in the presence of an organic solvent having a boiling point higher than that of the resulting monoalkylphosphine; the resulting reaction mixture is contacted with an alkali solution so that the remaining catalyst is removed into an aqueous phase in the form of a fluoride salt; next, the obtained reaction mixture is contacted with an alkali hydride and the impurities are removed, then distillation is carried out.
Thermal Stability of the tert-Butylphosphine-Trimethylaluminum Complex
Mitrofanov,Yablokov
, p. 1864 - 1866 (2007/10/03)
The tert-butylphosphine-trimethylaluminum complex was prepared. It is a viscous liquid with a low vapor pressure. The equilibrium thermal dissociation of the complex in the 350-385 K range was studied. The enthalpy of dissociation is 63.7±1.5 kJ mol-1. Irrveresible thermal decomposition of the complex starts at 470 K. The decomposition curves have a complex shape. A possible decomposition mechanism is proposed.
