Category: 224311-51-7

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Synthesis and characterization of (pi-allyl)palladium(II) complexes containing dialkylbiaryl phosphine ligands

Neutral (pi-allyl)palladium(II) halide complexes, which are air and moisture tolerant, containing dialkylbiaryl (alkyl = cyclohexyl or t-butyl) phosphine ligands, have been synthesized and characterized by 1H, 31P, 13C NMR spectroscopy, X-ray crystallography, and elemental analysis. Exposure of the halide complexes to sodium tetrakis(3,5-bis(trifluoromethyl)tetraphenylborate) (NaB(ArF)4) yields (pi-allyl)palladium(II) cations, in which coordination of the pendent lower ring of the biphenyl moiety of the dialkylbiaryl phosphine ligand occurs. These cations have been characterized by 1H, 31P, 13C NMR spectroscopy, X-ray crystallography, and elemental analysis. The cationic complexes are not fluxional on the NMR timescale and a significant interaction exists between palladium and the arene group.

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Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate

224311-51-7. Let¡¯s face it, organic chemistry can seem difficult to learn. Especially from a beginner¡¯s point of view. Like 224311-51-7, Name is 2-(Di-tert-Butylphosphino)biphenyl. In a document type is Review, introducing its new discovery.

Current methodologies for a sustainable approach to pi-conjugated organic semiconductors

The most effective synthetic methodologies currently employed for producing polymeric semiconductors are affected by cost, safety, and environmental issues which may seriously prevent their large-scale production. In this regard, the application of principles of green chemistry for the development of waste-minimized and cleaner synthetic approaches to semiconductor synthesis is essential for propelling the field of organic electronics. In this review, selected advances in the development of synthetic green strategies for the preparation of poly(arylene) families as well as their implication in the performance of selected opto-electronic devices such as organic thin-film transistors and bulk heterojunction solar cells are summarized.

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Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate

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Annual survey of organometallic metal cluster chemistry for the year 2000

The synthetic, mechanistic, and structural chemistry of organometallic metal cluster compounds is reviewed for the year 2000.

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Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate

Children learn through play, and they learn more than adults might expect. Science experiments are a great way to spark their curiosity, get their minds active, and encourage them to do something that doesn¡¯t involve a screen. 224311-51-7, 224311-51-7, C20H27P. A document type is Review, introducing its new discovery.

Non-classical hydrosilane mediated reductions promoted by transition metal complexes

This article reviews the most recent advances on the study of non-classical mechanisms for the reduction of organic substrates with hydrosilanes catalyzed by transition metals. A wide variety of catalytic cycles that go beyond the classical steps described for Ojima, Chalk-Harrod and modified Chalk-Harrod mechanisms, as representative examples, have been proposed in recent years. In this review, these alternative mechanistic proposals have been analyzed and classified according to the type of substrate, focusing on the reduction/hydrosilylation of carbonyl compounds (ketones and aldehydes), carbon dioxide, silylesters, amides, N-heterocycles, alkyl halides, nitriles, alkenes and alkynes. In spite of the broad diversity of non-classical reaction mechanisms hitherto reported, the catalytic cycles described for each substrate have been arranged in different categories according to their characteristics. The epigraph dedicated to the first type of substrate (carbonyl compounds) comprises most of the mechanisms described in this review for the reduction of polar bonds, which, to some extent, show a relationship to those proposed for non-polar bonds (alkenes and alkynes). Remarkable types of reaction mechanisms that will be dealt with in this work are: ionic mechanisms, ligand-assisted mechanisms, nonhydride mechanisms, NHC-Cu-H mediated mechanisms, and silylene-mediated mechanisms.

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Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate

Let¡¯s face it, organic chemistry can seem difficult to learn. Especially from a beginner¡¯s point of view. Like 224311-51-7, Name is 2-(Di-tert-Butylphosphino)biphenyl. In a document type is Article, introducing its new discovery., 224311-51-7

Synthesis of Ni(II) Complexes Supported by Tetradentate Mixed-Donor Bis(amido)/Phosphine/Phosphido Ligands by Phosphine Substituent Elimination

A convenient nickel-templated phenyl elimination route is described for the synthesis of phosphide-containing multidentate ligands from triarylphosphine precursors. Treating Ni(COD)2 with the neutral bis(amine)/bis(phosphine) ligand precursor H2 4Ph[PNNP] affords bis(amido)/bis(phosphine) complex 1. Treatment of 1 with 1 equiv of KH leads to elimination of a phenyl group from one of the phosphine fragments, generating bis(amido)/phosphine/phosphido complex 3Ph[PNNP]Ni- (2). Alternatively, excess KH or nBuLi affords the bis(amido)/bis(phosphide) complex 2Ph[PNNP]Ni2- (3 or 4, respectively) by elimination of two phenyl substituents. These reactions are high-yielding and provide a unique and straightforward route to chelating phosphido ligands that would otherwise be challenging to synthesize.

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Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate

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Multinuclear silver(i) XPhos complexes with cyclooctatetraene: Photochemical C-C bond cleavage of acetonitrile and cyanide bridged Ag cluster formation

Cationic mono-, di-, tri- and tetra-nuclear silver complexes with Buchwald-type phosphane (XPhos) and cyclooctatetraene (COT) have been synthesized and characterized. Formation of [(XPhos-Ag)n(COT)][SbF6]n (n = 1 and 2) complexes was confirmed by single-crystal X-ray crystallography and multinuclear NMR spectroscopy. Variable-temperature NMR spectroscopy in CD2Cl2 solution shows the fluxionality of the COT ring in the mono-Ag(i) XPhos complex. Fluxionality of COT was also confirmed in the case of the di-Ag(i) XPhos complex by solid-state and solution 31P NMR spectroscopy. The C-C bond cleavage of coordinated acetonitrile [XPhos-Ag(i)-NCCH3] resulting in cyanide bridged Ag cluster formation [(XPhos-Ag)2(mu-CN)n(mu-Ag)n-1] (n = 1, 2, 3 and 4) upon light excitation of [(XPhos-Ag)n(COT)] was confirmed by HRESI-MS, UV-Absorption and HR-TEM.

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Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate

Chemistry is an experimental science, and the best way to enjoy it and learn about it is performing experiments.Introducing a new discovery about 224311-51-7, Name is 2-(Di-tert-Butylphosphino)biphenyl, 224311-51-7.

Unusual reactivity of group 14 hydrides toward organic halides: Synthetic studies and application to functional materials

Extensive investigation of functional organosilicon and organogermanium compounds has identified various valuable applications in organic chemistry and advanced materials. This review summarizes the major developments of metal-mediated coupling reactions between group 14 hydrides and organic halides during the last decade with an emphasis on our own studies. High reactivity and selectivity have been achieved for C-Si and C-Ge bond formations under mild conditions. This transformation shows good functional group compatibility, and can serve as a powerful tool for the synthesis of medicinal, pharmaceutical, agrochemical, electrical, and photoluminescent compounds. Ground-and excited-state properties of fluorescence materials have been investigated by DFT and TD-DFT calculations, and several important aspects of the experimental observations have been validated. Direct functionalization of H-terminated Si and Ge surfaces has been demonstrated utilizing Pd-mediated arylation reactions, illustrating the potential for further development of the Pd-catalyzed reactions for the organic modification of semiconductor surfaces.

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Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate

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Dramatic mechanistic switch in Sn/AuI group exchanges: Transmetalation vs. oxidative addition

The mechanism of Ph/X exchange in reactions involving SnPhnBu3 and [AuXL] complexes switches dramatically from the usual concerted mechanism involving Ar/X mixed bridges when X = Cl, to an unexpected oxidative addition/reductive elimination pathway via an AuIII intermediate when X = vinyl.

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Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate

With the rapid development and complex challenges of chemical substances, new drug synthesis pathways are usually the most effective.224311-51-7,2-(Di-tert-Butylphosphino)biphenyl,as a common compound, the synthetic route is as follows.

Under nitrogen atmosphere, a mixture of 4-[[4-[2-[(tert-butoxycarbonyl)[(2R)-2-(3-chlorophenyl)-2-hydroxyethyl]amino]ethyl]phenyl]sulfonyl]phenyl trifluoromethanesulfonate (265 mg), palladium(II)acetate (5 mg), 2-[bis(tert-butyl)phosphino]biphenyl (12 mg), and powdered potassium phosphate (177 mg) in toluene (2.6 ml) was heated to 100¡ã C. for 10 hours.After being allowed to cool to room temperature, the mixture was concentrated and the residue was purified by column chromatography (silica gel, hexane/ethyl acetate) to give ethyl 4-[4-[[4-[2-[(tert-butoxycarbonyl)[(2R)-2-(3-chlorophenyl)-2-hydroxyethyl]-amino]ethyl]phenyl]sulfonyl]phenoxy]benzoate (93 mg) as a white amorphous. NMR (CDCl3, delta): 1.36 (9H, br s), 1.40 (3H, t, J=7 Hz), 2.60-3.05 (2H, m), 3.05-3.60 (4H, m), 4.27 (1H, br s, OH), 4.38 (2H, q, J=7 Hz), 4.86 (1H, m), 6.90-7.45 (10H, m), 7.86 (2H, d, J=8 Hz), 7.90 (2H, d, J=8 Hz), 8.07 (2H, d, J=8 Hz) (+)ESI-MS (m/z): 702 (M+Na)+

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Reference£º
Patent; FUJISAWA PHARMACEUTICAL CO., LTD.; US2004/106653; (2004); A1;,
Phosphine ligand
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate

With the rapid development and complex challenges of chemical substances, new drug synthesis pathways are usually the most effective.224311-51-7,2-(Di-tert-Butylphosphino)biphenyl,as a common compound, the synthetic route is as follows.

Example 9 A mixture of 5-(3-bromophenoxy)isophthalonitrile (75 mg), 3-hydroxybenzotrifluoride (61 mg), palladium(II) acetate (11 mg), tripotassium phosphate (0.106 g) and 2-(di-tert-butylphosphino)biphenyl (18 mg) in dry toluene was heated at reflux under a nitrogen atmosphere for 24 hours. Water and ethyl acetate were added to the cooled mixture, followed by acidification with aqueous hydrochloric acid (2M). The phases were separated and the organic layer dried over magnesium sulphate, concentrated and purified by flash chromatography. Elution with 5percent ethyl acetate/i-hexane gave 5-[3-(3-trifluoromethylphenoxy)phenoxy]isophthalonitrile (Compound 77, 32 mg), NMR 7.62 (1H, s); 7.52-7.37 (5H, m); 7.31 (1H, s); 7.25 (1H, d); 6.92 (1H, dd); 6.82 (1H, dd); 6.73 (1H, t).

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Reference£º
Patent; Cornell, Clive; Cramp, Michael Colin; Gingell, Michael; Westaway, Susan; US2003/181334; (2003); A1;,
Phosphine ligand
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate