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Reactions of 2,3-diferrocenylcyclopropenilium salts with bis-1,4-N,O-nucleophiles: Novel synthesis, characterization, chemical and electrochemical properties of the 2-(Z-1,2-diferrocenylvinyl)- 4,5-dihydrooxazole derivatives

A new method of synthesis of 2-(Z-1,2-diferrocenylvinyl)-4,5-dihydrooxazoles 3a-f and 5, 2-(Z-1,2-diferrocenylvinyl)-4,5-dihydrooxazol-3-ium salts 4a-f, 4g,h, and 9h-j by reactions of 2,3-diferrocenylcyclopropenylium salts 1a,b with 1,2-amino- and 1,2-N-alkylaminoalcohols in the presence of Et3N is described. The interactions of the salts 4a,d,f and 9h-j with morpholine and piperidine results in the corresponding (E)-2-[(N-2?,3?-diferrocenylacryloyl-2-(N-alkyl)amino]ethylmorpholines and piperidines. The characterization of the new compounds was done by IR, 1H and 13C NMR spectroscopy, mass-spectrometry, elemental analysis, and X-ray diffraction studies. Electrochemical properties of the compounds 3a-d and 4a-d were investigated using cyclic square voltammetry. One adsorption process and two electrochemical processes II and III, attributed to the oxidations of the ferrocene moieties, E0?(II), E0?(III), and comproportionation constant Kcom are reported.

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Reference£º
Chiral nitrogen ligands in late transition metal-catalysed asymmetric synthesis¡ªI. Addressing the problem of ligand lability in rhodium-catalysed hydrosilations,
Nitrogen-Containing Ligands for Asymmetric Homogeneous and Heterogeneous Catalysis

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In heterogeneous catalysis, the catalyst is in a different phase from the reactants. Formula: C9H11NO, At least one of the reactants interacts with the solid surface in a physical process called adsorption in such a way. 126456-43-7, name is (1S,2R)-1-Amino-2,3-dihydro-1H-inden-2-ol. In an article£¬Which mentioned a new discovery about 126456-43-7

Thiourea catalyzed organocatalytic enantioselective Michael addition of diphenyl phosphite to nitroalkenes

Bifunctional thiourea catalyzes the enantioselective Michael addition reaction of diphenyl phosphite to nitroalkenes. This methodology provides a facile access to enantiomerically enriched beta-nitrophosphonates, precursors for the preparation of synthetically and biologically useful beta-aminophosphonic acids. DFT level of computational calculations invoke the attack of the diphenyl phosphite to the nitroolefin by the Re face, this give light to this scarcely explored process update in the literature. The computational calculations support the absolute configuration obtained in the final adducts.

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Reference£º
Chiral nitrogen ligands in late transition metal-catalysed asymmetric synthesis¡ªI. Addressing the problem of ligand lability in rhodium-catalysed hydrosilations,
Nitrogen-Containing Ligands for Asymmetric Homogeneous and Heterogeneous Catalysis

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The impact of pressure and frictional heating on retention, selectivity and efficiency in ultra-high-pressure liquid chromatography

The effects of pressure and frictional heating deserve serious consideration in ultra-high-pressure liquid chromatography (UHPLC) separations, as the pressures used can be three times greater than those in conventional high-performance LC (HPLC). We show that the effects of pressure alone can give useful selectivity effects, especially when separating molecules of different size. Frictional heating effects can cause serious losses in column efficiency and may also give changes in the selectivity of the separation. Nevertheless, the detrimental effect of frictional heating can be reduced, for instance by the judicious selection of column thermostat and particle type. In practical situations, pressure and heating effects occur simultaneously and can cause problems in transferring methods from conventional HPLC to UHPLC. In reversed-phase separations, the typical effect of increased retention with increasing pressure is counteracted by the reduction in retention that usually occurs at elevated temperatures.

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Reference£º
Chiral nitrogen ligands in late transition metal-catalysed asymmetric synthesis¡ªI. Addressing the problem of ligand lability in rhodium-catalysed hydrosilations,
Nitrogen-Containing Ligands for Asymmetric Homogeneous and Heterogeneous Catalysis

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Kinetic resolution of amino alcohol derivatives with a chiral nucleophilic catalyst: Access to enantiopure cyclic cis-amino alcohols

Acylative kinetic resolution of racemic cyclic cis-amino alcohol derivatives with a chiral nucleophilic catalyst proceeds enantioselectively (s = 10-21) at ambient temperature to give enantiopure recovered materials, and the % conversion of the acylation can be readily controlled by the amount of acid anhydride.

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Reference£º
Chiral nitrogen ligands in late transition metal-catalysed asymmetric synthesis¡ªI. Addressing the problem of ligand lability in rhodium-catalysed hydrosilations,
Nitrogen-Containing Ligands for Asymmetric Homogeneous and Heterogeneous Catalysis

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Novel HIV reverse transcriptase inhibitors

The invention is related to compounds of Formula (I), (II), or (III): or a pharmaceutically acceptable salt, solvate, ester, and/or phosphonate thereof, compositions containing such compounds, and therapeutic methods that include the administration of such compounds.

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Reference£º
Chiral nitrogen ligands in late transition metal-catalysed asymmetric synthesis¡ªI. Addressing the problem of ligand lability in rhodium-catalysed hydrosilations,
Nitrogen-Containing Ligands for Asymmetric Homogeneous and Heterogeneous Catalysis

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Trans-glycosidation process for the synthesis of (2R, 2-alpha-R, 3a) -2-(1- (3,5-bis(trifluoromethyl) phenyl) ethoxy ) -3- (4-fluorophenyl) -1, 4-oxazine

The present invention is concerned with novel processes for the preparation of (2R, 2-alpha-R, 3a)-2-[1-[3,5-bis(trifluoromethyl)phenyl]ethoxy-3-(4-fluorophenyl)-1,4-oxazine. This compound is useful as an intermediate in the synthesis of compounds which possess pharmacological activity.

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Reference£º
Chiral nitrogen ligands in late transition metal-catalysed asymmetric synthesis¡ªI. Addressing the problem of ligand lability in rhodium-catalysed hydrosilations,
Nitrogen-Containing Ligands for Asymmetric Homogeneous and Heterogeneous Catalysis

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Cyclic imidate salts in acyclic stereochemistry: Diastereoselective syn-epoxidation of 2-alkyl-4-enamides to epoxyamides

Reaction of 2-alkyl-4-enamides with I+ and aqueous sodium bicarbonate results in the diastereoselective formation of the corresponding iodohydrins with essentially no iodolactone by-product. The reaction appears to proceed through a cyclic imidate type intermediate. This methodology has been successfully employed for the synthesis of the epoxide intermediate of the orally active HIV-1 protease inhibitor MK-639 (indinavir sulfate).

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Reference£º
Chiral nitrogen ligands in late transition metal-catalysed asymmetric synthesis¡ªI. Addressing the problem of ligand lability in rhodium-catalysed hydrosilations,
Nitrogen-Containing Ligands for Asymmetric Homogeneous and Heterogeneous Catalysis

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Steric and electronic influences on the addition of pyridines to the tricarbonyl(2-methoxycyclohexadienyl)iron(II) cation

Kinetic studies of the reversible addition of pyridines to the cation + (1) provide further support of the dependence of the rate on the steric and electronic nature of the attacking nucleophile.A comparison of plots of log k1 versus pKa for pyridine additions to 1 and to the cations + (3) and + (4) indicate that the accumulation of positive charge in the transition states of these systems decreases along the series C6H7 > 2-MeOC6H6 > C7H9 (i.e. 3 > 1 > 4, in accordance with their decreasing electrophilicities.

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Reference£º
Chiral nitrogen ligands in late transition metal-catalysed asymmetric synthesis¡ªI. Addressing the problem of ligand lability in rhodium-catalysed hydrosilations,
Nitrogen-Containing Ligands for Asymmetric Homogeneous and Heterogeneous Catalysis

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waylen apperception HIV reverse transcriptase inhibitors in accordance with the law of the process for the asymmetric synthesis of one-pot synthesis (by machine translation)

The invention relates to a novel one pot method asymmetric synthesis process of a (S)-6-chlorine-4-cylopropyl ethylnen-4-trifluoromethyl-1,4-dihydro-2H-1,3-benzoxazine-2-ketone (Efavirenz) compound, the compound can be used as an reverse transcriptase inhibitor for human immunodeficiency virus (HIV). The invention also relates to a novel aminoalcohol ligand used for the process.

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Reference£º
Chiral nitrogen ligands in late transition metal-catalysed asymmetric synthesis¡ªI. Addressing the problem of ligand lability in rhodium-catalysed hydrosilations,
Nitrogen-Containing Ligands for Asymmetric Homogeneous and Heterogeneous Catalysis

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Reactivity of Neutral Nitrogen Donors in Planar d8 Metal Complexes. Part 1. The System <1,2-Bis(phenylsulfanyl)-ethane>dichloroplatinum(II) with Pyridines in Methanol. Effect of Basicity and Steric Hindrance

The kinetics of the forward and reverse steps of the process + am <-/-> (+) + Cl(-) (am = one of a number of pyridines and other heterocyclic nitrogen bases covering a wide range of basicity) has been studied in methanol at 25 deg C.Both forward and reverse reactions obey the usual two-term rate law observed in square-planar substitution.The second-order rate constants for the forward reactions, k2f, show only a slight dependence upon the nature of the entering pyridine, and steric hindrance due to the presence of one or two methyl groups in alpha position to the nitrogen markedly decreases the reactivity.The first- and second-order rate constants for the reverse reaction are very sensitive to the basicity of the leaving group and a plot of log k2r against the pKa of the conjugate acids of unhindered pyridines is linear with a slope of -0.56.Steric retardation for monosubstituted alpha-methylpyridines is relatively small.The equilibrium constants for these reactions have been determined from the ratio of the rate constants and a plot of log K against the pKa of the unhindered pyridines is linear with a slope of 0.58.The results are compared with data from the literature and discussed in terms of the reaction profile.

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Reference£º
Chiral nitrogen ligands in late transition metal-catalysed asymmetric synthesis¡ªI. Addressing the problem of ligand lability in rhodium-catalysed hydrosilations,
Nitrogen-Containing Ligands for Asymmetric Homogeneous and Heterogeneous Catalysis