Tag: M.W:100-200

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Method for synthesizing D-proline

The invention belongs to the technical field of synthesis of chiral organic compounds, and especially relates to a method for synthesizing D-proline. The method comprises the following steps: taking pyrrolidine-2-carbaldehyde, dissolving the pyrrolidine-2-carbaldehyde in an organic solvent, adding a catalyst and an organic alkali potassium t-butoxide, and carrying out an asymmetric catalysis hydrogenation reaction to obtain an intermediate II; and carrying out an oxidation reaction on the intermediate II and an oxidant to obtain the product D-proline III. The method for synthesizing D-prolinehas the following advantages: the use amount of the catalyst is small, and the catalyst can be used repeatedly, so the cost is saved; the solvent used in the synthesis process is a common solvent, sothe method has the characteristics of low cost, non-toxicity, no pollution, greenness and environmental protection; and the synthesis method has a simple process, the yield in the invention is higherthan the yield in the prior art, and the optical purity of the obtained product is high, so the method is suitable for industrial production.

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Reference£º
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Chemistry is an experimental science, Safety of N1,N2-Di-tert-butylethane-1,2-diamine, and the best way to enjoy it and learn about it is performing experiments.Introducing a new discovery about 4062-60-6, Name is N1,N2-Di-tert-butylethane-1,2-diamine

Formation and reactivity of gold carbene complexes in the gas phase

A series of ligated gold(I) carbenes (where the ligand is Ph3P, Me2S, or an N-heterocyclic carbene, NHC) were formed in the gas phase by a variety of methods. Gold(I) benzylidenes could be formed using Chens method of dissociating an appropriate phosphorus ylide precursor. The resulting carbene undergoes an addition reaction with olefins to give an adduct. The adduct undergoes a second gas-phase reaction with an olefin, where presumably a cyclopropanation product is displaced by the second olefin molecule. Both steps in the process were analyzed with linear free energy relationships (i.e., Hammett plots). Under collision-induced dissociation conditions, the adduct undergoes competing processes: (1) dissociation of the cyclopropanation product to give ligated gold(I) species and (2) metathesis to give a more stable gold(I) carbene. Attempts to form less stable gold(I) carbenes in the gas phase by Chens approach or by reactions of diazo species with the ligated gold(I) cations were not successful-processes other than carbene formation are preferred or the desired carbene, after formation, rearranges rapidly to a more stable species. In accord with other recent work, the data suggest that coordination to a ligated gold(I) cation in the gas phase may not offer sufficient stabilization to carbenes to prevent competition from rearrangement processes.

Sometimes chemists are able to propose two or more mechanisms that are consistent with the available data. Safety of N1,N2-Di-tert-butylethane-1,2-diamine, If a proposed mechanism predicts the wrong experimental rate law, however, the mechanism must be incorrect.Welcome to check out more blogs about 4062-60-6, in my other articles.

Reference£º
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

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Gold(I)/Xiang-Phos-Catalyzed Asymmetric Intramolecular Cyclopropanation of Indenes and Trisubstituted Alkenes

The first intramolecular enantioselective cyclopropanation of indenes and trisubstituted alkenes was accomplished by using new chiral phosphine X5 derived gold(I) complexes. This reaction is a straightforward, efficient method for constructing [5-3-6] fused-ring compounds with two vicinal all-carbon quaternary stereogenic centers, a core structure shared by numerous pharmacological products, and bioactive compounds. The salient features of this transformation include high enantioselectivity (up to >98% ee), excellent yield (>97%), and nice functional group tolerance.

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Reference£º
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Chemistry is the experimental and theoretical study of materials on their properties at both the macroscopic and microscopic levels.In a patent£¬ Quality Control of: 6,6′-Dimethyl-2,2′-bipyridine, Which mentioned a new discovery about 4411-80-7

Heteroleptic Cu(I) bis-diimine complexes of 6,6?-dimesityl-2, 2?-bipyridine: A structural, theoretical and spectroscopic study

A series of heteroleptic Cu(I) complexes containing 6,6?-dimesityl-2, 2?-bipyridine and phenanthroline-, bipyridine-, and biquinoline-based ligands is studied. The HETPHEN strategy is utilized to synthesize the heteroleptic complexes, which are stable in solution. The X-ray crystal structures of the complexes are presented; the solid-state four-coordinate Cu(I) geometries are quantified by using the tau4 parameter. A feature of the crystal structures is the intramolecular pi-stacking between the mesityl ring(s) and the diimine ligand; the phen-based complexes exhibit stacking between the phen ligand and one of the mesityl rings, creating a “Pac-Man” motif. On the other hand, the bpy-based complexes show different types of packing interaction, with both mesityl rings “clamping down” on the bpy based ligand to give pi-stacking. Cyclic voltammetry is used to examine the redox chemistry of the complexes. The most positive potentials for the oxidation process are observed for the complexes with bulky substituents ortho to the coordination nitrogens atoms, i.e., 2,9-dimethyl-1,10-phenanthroline and 6,6?-dibromo-2,2?-bipyridine. The Cu(I) MLCT transitions of the complexes are investigated by resonance Raman spectroscopy in concert with TD-DFT calculations. The resonance Raman spectra of complexes containing substituted biquinolines are straightforward, in that vibrational bands of the biquinoline-based ligand are selectively enhanced over bpy(Mes)2 bands. This is consistent with the purple color of the complexes, due to the lower energy of the biquinoline-based LUMO compared to the bpy(Mes)2 LUMO. All the phen- and bpy-based complexes show enhancement of bpy(Mes)2 bands.

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Reference£º
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, Recommanded Product: (1R,2R)-Cyclohexane-1,2-diamine, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 20439-47-8, Name is (1R,2R)-Cyclohexane-1,2-diamine, molecular formula is C6H14N2. In a Article, authors is Mimoun, Hubert£¬once mentioned of 20439-47-8

Enantioselective reduction of ketones by polymethylhydrosiloxane in the presence of chiral zinc catalysts

Enantioselective reduction of ketones, particularly acetophenones, by polymethylhydrosiloxane (PMHS) to the corresponding secondary alcohols can be achieved with high yields and enantiomeric excesses (ee’s) up to 88% in the presence of chiral zinc catalysts (eq 1). Two catalytic systems have been developed giving similar ee’s: (i) System A: ZnEt2 + chiral diimine or diamine 1-10. (ii) System B: Zn(carboxylate)2 + chiral diamine activated by Vitride. System B is inexpensive, stable, and ready to use in toluene, providing either (R) or (S) chiral secondary alcohols with 70-80% ee in the presence of (S,S)-or (R,R)-N,N?-ethylenebis-(1-phenylethylamine) (ebpe, 6). The reduction has been carried out at the 1 kg scale without scale-up problems. The ligand is cheap and is recovered at the end of reaction by simple distillation from residues of the organic phase. Both precursors ZnMe2¡¤(S,S)-ebpe (A) and Zn(dea)2¡¤(S,S)-ebpe (B) for systems A and B, respectively, have been isolated and characterized by X-ray structure and exhibit the same catalytic properties and the same ee’s for the reduction of acetophenone as the in situ prepared catalytic system. The complex ZnEt2¡¤(S,S)-ebpe) (A?) reacts with benzaldehyde to give the seven-membered ring dimer complex La in which benzaldehyde inserts into the Zn-N bond of complex A?. Acetophenone also reacts with A? to give a similar seven-membered ring dimer complex Lb. Both La and Lb are catalysts for the enantioselective reduction of acetophenone by PMHS and gave activities and ee’s similar to those of A?. Synthetic and mechanistic aspects of this new economical method are discussed in this paper.

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Reference£º
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Reference of 2177-47-1, The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.2177-47-1, Name is 2-Methyl-1H-indene, molecular formula is C10H10. In a Patent£¬once mentioned of 2177-47-1

Process for preparing 1-indanones

The present invention relates to a process for preparing 1-indanones of formula I: 1and isomers thereof, wherein R1, R2, R3, R4, R5, and R6 independently represent H or a C1-C20 hydrocarbon group or R1 and R2 or R2 and R3 or R3 and R4 and/or R5 and R6 together with the carbon atoms to which they are attached form a saturated or unsaturated 5- or 6-membered ring, said hydrocarbon group and/or said ring optionally containing one or more hetero atoms, said ring optionally being substituted with a C1-C4 hydrocarbon group, said process comprising reacting a compound of formula II: 2wherein R1, R2, R3, R4, R5, and R6 have the same meaning as defined above, with a chlorinating agent, followed by reaction with a Friedel-Crafts catalyst. The invention further relates to the preparation of the corresponding indenes.

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Reference£º
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Application of 3105-95-1, The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.3105-95-1, Name is H-HoPro-OH, molecular formula is C6H11NO2. In a Patent£¬once mentioned of 3105-95-1

SERINE PROTEASES, THEIR ACTIVITY AND THEIR SYNTHETIC INHIBITORS

The present invention relates to new compounds of the general formula: Z-Xaa-Y’, in which Xaa is an amino acid, Z is a protecting group and Y’ is one of various types of ring structures. The new compounds have a modulating activity on serine proteases. The invention further relates to the use of the compounds in therapy and diagnosis and to a method of purifying the serine protease DPPIV.

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Reference£º
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Synthetic Route of 105-83-9, The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.105-83-9, Name is N1-(3-Aminopropyl)-N1-methylpropane-1,3-diamine, molecular formula is C7H19N3. In a Article£¬once mentioned of 105-83-9

ACTIVATION OF NITROSO GROUP WITH THIOLS. A NEW TRANSFORMATION OF PRIMARY AMINES TO ORGANIC SULFIDES OR THIOLS

Aliphatic primary amines reacted with 2-mercaptobenzothiazole in the presence of t-butylnitrite at room temperature to give condensation products, 2-(alkylthio)benzothiazole.

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Reference£º
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Chemistry is the experimental and theoretical study of materials on their properties at both the macroscopic and microscopic levels.In a patent£¬ COA of Formula: C9H23N3, Which mentioned a new discovery about 3030-47-5

Fabrication of nitrogen-doped hollow carbon nanospheres with variable nitrogen contents using mixed polymer brushes as precursors

Design and synthesis of heteroatoms-doped porous carbon model materials with controllable nitrogen contents and similar pore structure are of great importance for fundamental understanding of the correlation between their intrinsic properties and applications. Herein, we report a synthetic strategy for synthesis of nitrogen-doped hollow carbon nanospheres with variable nitrogen contents, similar pore structure and morphology by pyrolysis of mixed polymer brushes formed through surface-initiated atom transfer radical polymerization of monomer mixtures of styrene and 4-vinylpyridine. With increasing 4-vinylpyridine fractions in the monomer mixture, nitrogen contents in the final carbon products increase up to about 5.5 wt%. As example applications, electrocatalytic performance for oxygen reduction reactions in both basic and acidic media and carbon dioxide adsorption properties of the thus-formed materials are investigated to evaluate the synthetic approach. The results reveal that the higher nitrogen contents doped in carbon do not guarantee the better performance for either electrocatalysis or carbon dioxide adsorption. It is the fraction of pyridinic nitrogen that dominates the electrocatalytic activity and carbon dioxide adsorption capacity. The findings demonstrate that mixed polymer brushes are promising precursors for the formation of heteroatoms-doped carbon materials, particularly as model materials for fundamental understanding their structure?properties correlations.

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Reference£º
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Application of 6974-97-6, The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.6974-97-6, Name is 4,7-Dimethyl-1H-indene, molecular formula is C11H12. In a Patent£¬once mentioned of 6974-97-6

Process for preparing 2-aryl-substituted indenes

A process is disclosed for preparing 2-aryl-substituted indenes by reacting an indene with an arene compound substituted with an halogen atom, preferably a iodine atom, or with an organosulphonate group, said reaction being carried out in a basic medium in the presence of a palladium catalyst. The compounds obtainable by this process can be used to prepare metallocene compounds with transition metals such as titanium, zirconium or hafnium, which are useful as catalyst components in the polymerization of olefins.

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Reference£º
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI