Month: December 2020

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. 12150-46-8, 12150-46-8, C34H28FeP2. A document type is Article, introducing its new discovery.

Controlled acidolysis of hexacarbonyltris(mu-alkoxo)dirhenium(I) anions: Facile synthesis of hexacarbonylbis(mu-alkoxo)-[mu-1,1?-bis(diphenylphosphino)ferrocene] dirhenium(I) complexes and nonacarbonyltris(mu-methoxo)(mu3-methoxo)trirhenium(I)

The complexes [Re2(mu-OR)2(mu-dppf)(CO)6] (R = H, 1; Me, 2; Et, 3; Ph, 4) were synthesized by the controlled acidolysis of the anions [Re2(mu-OR)3(CO)6]- (R = H, Me, Et) and [Re2(mu-OH)(mu-OPh)2(CO)6]- (5), respectively, in the presence of dppf (1,1?-bis(diphenylphosphino)-ferrocene). The dppf ligands in complexes 1-4 undergo a twisting motion in solution at room temperature, which, in the case of 3, is correlated with the restricted rotation of the ethyl groups about the O-CH2 bonds. Complex 3 is an interesting example of an organometallic complex in which the two exchanging positions of the methylen protons of an ethyl group are nonequivalent, while the exchanging positions of the methyl group are equivalent. Controlled acidolysis of [Re2(mu-OMe)3(CO)6]- under 1 atm of CO pressure affords the complex [Re3(mu-OMe)3(mu3-OMe)(CO) 9]- (6), which consists of Re3 triangle held together by one face-capping and three bridging methoxo groups, with no Re-Re bonds. The crystal structures of 1, 3, 5, and 6, were determined by single-crystal X-ray diffraction analysis. The synthetic relationship of dirhenium-dialkoxo, dirhenium-trialkoxo, and trirhenium-tetraalkoxo entities is established.

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Reference£º
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 7650-91-1, Name is Benzyldiphenylphosphine, 7650-91-1.

Synthesis and 13C NMR study of the triangulo-clusters [Pt3(mu-CO)3 – (n)(mu-SO2)(n)(PR3)3] (n = 0-3)

[Pt3(mu-CO)3(PPh3)3] was prepared in high yield by the reaction of [Pt3(mu-CO)3(PPh3)4] with H2O2. The carbonyl ligands in [Pt3(mu-CO)3(PR3)3] (PR3 = PPh3, PPh2Bz, PCy3, P(i)Pr3) may be completely replaced by sulfur dioxide to give [Pt3(mu-SO2)3(PR3)3] or partially by one SO2 to give [Pt3(mu-CO)2(mu-SO2)(PR3)3] (PR3 = PCy3 and P(i)Pr3). On the other hand, the addition of one molar equivalent of carbon monoxide to [Pt3(mu-SO2)3(PR3)3] (PR3 = PCy3; P(i)Pr3) gave the complexes [Pt3(mu-CO)(mu-SO2)2(PR3)3]. Complete simulation of the 13C NMR spectra could be achieved with the help of 195Pt NMR data. (C) 2000 Elsevier Science S.A.

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Reference£º
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

1608-26-0. Let¡¯s face it, organic chemistry can seem difficult to learn. Especially from a beginner¡¯s point of view. Like 1608-26-0, Name is Tris(dimethylamino)phosphine
. In a document type is Article, introducing its new discovery.

NEW CHEMISTRY AND STEREOCHEMISTRY OF ORGANOPHOSPHORUS PSEUDOHALOGENS

Synthesis, chemistry and stereochemistry of organophosphorus-sulfur(selenium)pseudohalogens are discussed and rationalized.

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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 131274-22-1, Name is Tri-tert-butylphosphonium tetrafluoroborate, 131274-22-1.

Spin-Selective Photoreduction of a Stable Radical within a Covalent Donor-Acceptor-Radical Triad

Controlling spin-spin interactions in multispin molecular assemblies is important for developing new approaches to quantum information processing. In this work, a covalent electron donor-acceptor-radical triad is used to probe spin-selective reduction of the stable radical to its diamagnetic anion. The molecule consists of a perylene electron donor chromophore (D) bound to a pyromellitimide acceptor (A), which is, in turn, linked to a stable alpha,gamma-bisdiphenylene-beta-phenylallyl radical (R?) to produce D-A-R?. Selective photoexcitation of D within D-A-R? results in ultrafast electron transfer to form the D+?-A-?-R? triradical, where D+?-A-? is a singlet spin-correlated radical pair (SCRP), in which both SCRP spins are uncorrelated relative to the R? spin. Subsequent ultrafast electron transfer within the triradical forms D+?-A-R-, but its yield is controlled by spin statistics of the uncorrelated A-?-R? radical pair, where the initial charge separation yields a 3:1 statistical mixture of D+?-3(A-?-R?) and D+?-1(A-?-R?), and subsequent reduction of R? only occurs in D+?-1(A-?-R?). These findings inform the design of multispin systems to transfer spin coherence between molecules targeting quantum information processing using the agency of SCRPs.

Balanced chemical reaction does not necessarily reveal either the individual elementary reactions by which a reaction occurs or its rate law.131274-22-1. In my other articles, you can also check out more blogs about 131274-22-1

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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 the experimental science by definition. We want to make observations to prove hypothesis. For this purpose, we perform experiments in the lab. 166330-10-5, Name is (Oxybis(2,1-phenylene))bis(diphenylphosphine)166330-10-5, introducing its new discovery.

Synthetic studies on furanosteroids: Construction of the viridin core structure via diels-alder/ retro- diels-alder and vinylogous mukaiyama aldol-type reaction

The synthesis of the viridin class of furanosteroids core skeleton from the readily available 2,3-dihydro-4-hydroxyinden-1-one (6) is described. Our strategy was broken down into three parts: (1) Synthesis of functionalized alkyne oxazoles of type 5; (2) intramolecular Diels-Alder/retro-Diels-Alder reaction of 5 followed by tautomerization and elaboration of R to give silylated furanonaphthols 4 bearing an aldehyde side chain; and (3) annulation of ring A by intramolecular vinylogous Mukaiyama aldol-type cyclization. Two major challenges were faced in the last step: (i) furanonaphthol derivatives bearing a beta-hydroxyaldehyde functionality (R1 = OH) suffered from dehydration to the E-enal, which is geometrically incapable of cyclization, and (ii) the functionality at C17 had a strong influence on the conversion of 4 to 3, as exemplified by the failure of the free ketone (X = O) or its derivatives (X = H, OH; X = H, OAc) to cyclize. In the end, success was realized with the analogous C17-norketone (X = H, H).

166330-10-5, Sometimes chemists are able to propose two or more mechanisms that are consistent with the available data. If a proposed mechanism predicts the wrong experimental rate law, however, the mechanism must be incorrect.Welcome to check out more blogs about 166330-10-5, in my other articles.

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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 the science of change. But why do chemical reactions take place? Why do chemicals react with each other? The answer is in thermodynamics and kinetics.In a document type is Article, 29949-84-6, the author is Feng, Jiaxu and a compound is mentioned, 29949-84-6, Tris(3-methoxyphenyl)phosphine, introducing its new discovery.

Phosphine-catalyzed (3+2)/(2+3) sequential annulation involving a triple nucleophilic addition reaction of gamma-vinyl allenoates

A phosphine-catalyzed (3+2)/(2+3) sequential annulation involving a triple nucleophilic addition reaction of gamma-vinyl allenoates was successfully developed. The reaction provided efficient and more practical access to functionalized hydropyrroloimidazolones with good to excellent yields under mild reaction conditions. Notably, gamma-vinyl allenoate served as a triple-electrophilic intermediate in this protocol.

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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

564483-19-8, An article , which mentions 564483-19-8, molecular formula is C29H45P. The compound – Di-tert-butyl(2′,4′,6′-triisopropyl-[1,1′-biphenyl]-2-yl)phosphine played an important role in people’s production and life.

Design and preparation of new palladium precatalysts for C-C and C-N cross-coupling reactions

A series of easily prepared, phosphine-ligated palladium precatalysts based on the 2-aminobiphenyl scaffold have been prepared. The role of the precatalyst-associated labile halide (or pseudohalide) in the formation and stability of the palladacycle has been examined. It was found that replacing the chloride in the previous version of the precatalyst with a mesylate leads to a new class of precatalysts with improved solution stability and that are readily prepared from a wider range of phosphine ligands. The differences between the previous version of precatalyst and that reported here are explored. In addition, the reactivity of the latter is examined in a range of C-C and C-N bond forming reactions.

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Reference£º
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

564483-18-7, Name is 2-(Dicyclohexylphosphino)-2′,4′,6′-tri-i-propyl-1,1′-biphenyl, molecular formula is C33H49P, belongs to chiral-phosphine-ligands compound, is a common compound. In a patnet, assignee is DING, FA-Xiang564483-18-7, once mentioned the new application about 564483-18-7

NOVEL SPIROPIPERIDINE PROLYLCARBOXYPEPTIDASE INHIBITORS

Compounds of structural formula (I) are inhibitors of prolylcarboxypeptidase (PrCP). The compounds of the present invention are useful for the prevention and treatment of conditions related to enzymatic activity of PrCP such as abnormal metabolism, including obesity; diabetes; metabolic syndrome; obesity related disorders; and diabetes related disorders.

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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 1608-26-0, 1608-26-0, Name is Tris(dimethylamino)phosphine
, molecular formula is P[N(CH3)2]3.

Ancillary ligand effects upon dithiolene redox noninnocence in tungsten Bis(dithiolene) complexes

An expanded set of compounds of the type [W(S2C 2Me2)2L1L2]n (n = 0: L1 = L2 = CO, 1; L1 = L2 = CNtBu, 2; L1 = CO, L2 = carbene, 3; L 1 = CO, L2 = phosphine, 4; L1 = L2 = phosphine, 5. n = 2-: L1 = L2 = CN-, [6] 2-) has been synthesized and characterized. Despite isoelectronic formulations, the compound set reveals gradations in the dithiolene ligand redox level as revealed by intraligand bond lengths, upsilonCCchelate, and rising edge energies in the sulfur K-edge X-ray absorption spectra (XAS). Differences among the terminal series members, 1 and [6]2-, are comparable to differences seen in homoleptic dithiolene complexes related by full electron transfer to/from a dithiolene-based MO. The key feature governing these differences is the favorable energy of the CO pi* orbitals, which are suitably positioned to overlap with tungsten d orbitals and exert an oxidizing effect on both metal and dithiolene ligand via pi-backbonding. The CN- pi* orbitals are too high in energy to mix effectively with tungsten and thus leave the filled dithiolene pi* orbitals unperturbed. This work shows how, and the degree to which, the redox level of a noninnocent ligand can be modulated by the choice of ancillary ligands(s).

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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 the science of change. But why do chemical reactions take place? Why do chemicals react with each other? The answer is in thermodynamics and kinetics.In a document type is Article, 161265-03-8, the author is Fox, Daniel J. and a compound is mentioned, 161265-03-8, (9,9-Dimethyl-9H-xanthene-4,5-diyl)bis(diphenylphosphine), introducing its new discovery.

A model iridium hydroformylation system with the large bite angle ligand xantphos: Reactivity with parahydrogen and implications for hydroformylation catalysis

Iridium complexes containing the large bite angle bisphosphine ligand xantphos have been synthesized and their reactivity studied. Several of these complexes are the first reported Ir(xantphos) systems to be characterized by X-ray diffraction. Variable-temperature NMR spectroscopic studies of IrI(CO)2(xantphos) (1-I) and Ir(COEt)(CO)2-(xantphos) (8) show two separate dynamic processes in which the phosphorus donors and the backbone methyl groups of the xantphos ligand are exchanged. The addition of parahydrogen (p-H2) to 1-I leads to the formation of two dihydride isomers including one in which both hydride ligands are trans to the phosphorus donors, suggestive of an Ir(I) xantphos intermediate with the ligand chelated in a trans-spanning fashion (2b). The bromide and chloride Ir(I) analogues (1-Br and 1-Cl) also form this isomer upon reaction with parahydrogen, with 1-Cl yielding only this dihydride species. The trihydride complex IrH 3(CO)(xantphos) (7) has been prepared, and its exchange with free hydrogen at elevated temperature is confirmed by reaction with p-H2. The hydride complexes IrH(CO)2(xantphos) (6) and IrH 3(CO)(xantphos) (7), as well as the propionyl complex 8, are modest catalysts for the hydroformylation of 1-hexene and styrene under mild conditions. The addition of p-H2 to 8 permits direct observation of the propionyl dihydride species IrH2(COEt)(CO)(xantphos) (9) under both thermal and photolytic conditions, as well as unusual but weak polarization of the aldehydic proton of the propanal product that forms upon reductive elimination from 9.

But sometimes, even after several years of basic chemistry education,, 161265-03-8 it is not easy to form a clear picture on how they govern reactivity! Read on for other articles about 161265-03-8!

Reference£º
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