Tag: M.W:100-200

Synthetic Route of 344-25-2, The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.344-25-2, Name is H-D-Pro-OH, molecular formula is C5H9NO2. In a Article，once mentioned of 344-25-2

Bacterial defense mechanisms have evolved to protect bacteria against predation by nematodes, predatory bacteria, or amoebae. We identified novel bacterial alkaloids (pyreudiones A?D) that protect the producer, Pseudomonas fluorescens HKI0770, against amoebal predation. Isolation, structure elucidation, total synthesis, and a proposed biosynthetic pathway for these structures are presented. The generation of P. fluorescens gene-deletion mutants unable to produce pyreudiones rendered the bacterium edible to a variety of soil-dwelling amoebae.

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Reference：
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， Recommanded Product: 105-83-9, Which mentioned a new discovery about 105-83-9

Eight oxamato-bridged heterotrinuclear NiIICuIINiII complexes of formula {[Ni(H2O)(dpt)]2(mu-Cu(H2O)(opba))} (ClO4)2 (1), {[Ni(H2O)(dien)]2(mu-Cu(pba))}(ClO4) 2·6H2O (2), {[Ni(H2O)(Medpt)]2(mu-Cu(OHpba))} (ClO4)2·4H2O (3), {[Ni(H2O)- (dien)]2(mu-Cu(Me2pba))} (ClO4)2·2.5H2O (4), {[Ni(H2O)(dpt)]2(mu-Cu(Me2pba))} (ClO4)2·2H2O (5), {[Ni(H2O)(dien)]2(mu- Cu(OHpba))}(ClO4)2·4H2O (6), {[Ni2(dpt)2(mu-Cu(H2O) (pba))]2(mu-N3)2}Na2 (ClO4)4·6H2O (7), and {[Cu(H2O)2(dpt)Ni2- (H2O)(dpt)2](mu-H2 Me2pba(2-))}(ClO4)4·3H2O (8) in which opba = o-phenylenbis(oxamato), pba = 1,3- propylenebis(oxamato), OHpba = 2-hydroxy-1,3-propylenebis(oxamato), Me2pba = 2,2-dimethyl-1,3-propylenbis(oxamato), dpt = 3,3?-diaminodipropylamine, dien = 2,2?-diaminodiethylamine, and Medpt = 3,3?-diamino-N-methyldipropylamine were synthesized and characterized. The crystal structures of 1, 7, and 8 were solved. For complex 1, the trinuclear entities are linked by hydrogen bonds forming a one-dimensional system, and for complex 8, the presence of van der Waals interactions gives a one-dimensional system, too. For complex 7, the trinuclear entities are self-assembled by azido ligands, given a hexanuclear system; each of these hexanuclear entities are self-assembled through two [Na(O)3(H2O)3] octahedral-sharing one-edge entities, given a one-dimensional system. The magnetic behavior of complexes 2-7 was investigated by variable-temperature magnetic susceptibility measurements. Complexes 2-6 exhibit the minimum characteristic of this kind of polymetallic species with an irregular spin state structure. The J value through the oxamato bridge varied between -88 cm-1 (for 6) and -111.2 cm-1 (for 5). For complex 7, the values obtained were J1 = -101.7 cm-1 (through the oxamato ligand) and J2 = -3.2 cm-1 (through the azido ligand).

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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， Formula: C5H9NO2, Which mentioned a new discovery about 344-25-2

The central effects of L-proline, D-proline and trans-4-hydroxy-L-proline were investigated by using the acute stressful model with neonatal chicks in Experiment 1. Sedative and hypnotic effects were induced by all compounds, while plasma corticosterone release under isolation stress was only attenuated by L-proline. To clarify the mechanism by which L-proline and D-proline induce sedative and hypnotic effects, the contribution of the strychnine-sensitive glycine receptor (glycine receptor) and N-methyl-D-aspartate glutamate receptor (NMDA receptor) were further investigated. In Experiments 2-3, the glycine receptor antagonist strychnine was co-injected intracerebroventricular (i.c.v.) with L-proline or D-proline. The suppression of isolation-induced stress behavior by D-proline was attenuated by strychnine. However, the suppression of stress behavior by L-proline was not attenuated. In Experiment 4, the NMDA receptor antagonist (+)-MK-801 was co-injected i.c.v. with L-proline. The suppression of stress behavior by L-proline was attenuated by (+)-MK-801. These results indicate that L-proline and D-proline differentially induce sedative and hypnotic effects through NMDA and glycine receptors, respectively.

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

Electric Literature 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

Herein, we report the syntheses, spectral and structural characterization, and magnetic behavior of four new dinuclear terephthalato-bridged copper(II) complexes with formulae [Cu2(trpn)2(mu-tp)](ClO 4)2·2H2O (1), [Cu2(aepn) 2(mu-tp)(ClO4)2] (2), [Cu2(Medpt) 2(mu-tp)(H2O)2](ClO4)2 (3) and [Cu2(Et2dien)2(mu-tp)(H 2O)](ClO4)2 (4) where tp = terephthalate dianion, trpn = tris(3-aminopropyl)-amin, aepn = N-(2-aminoethyl)-1,3- propanediamine, Medpt = 3,3?-diamino-N-methyldipropylmine and Et 2dien = N,N-diethyldiethylenetriamine. The structures of these complexes consist of two mu-tp bridging Cu(II) centers in a bis(monodentate) bonding fashion. The coordination geometry of the Cu(II) ions in these compounds may be described as close to square-based pyramid (SP) with severe significant distortion towards trigonal bipyramid (TBP) stereochemistry in 1. The visible spectra of the complexes in aqueous solutions are in complete agreement with the assigned X-ray geometry around the Cu(II) centers. Also, the solid infrared spectral data for the stretching frequencies of the tp-carboxalato groups, the nu(COO-) reveals the existence of bis(monodentate) coordination mode for the bridged terephthalate ligand. The susceptibility measurements at variable temperature over the range 2-300 K are reported. Despite the same bonding mode of the tp bridging ligand, there has been observed slight antiferromagnetic coupling for the compounds 1 and 4 with J values of -0.5 and -2.9 cm3 K mol-1, respectively, and very weak ferromagnetic coupling for 2 and 3 with J values of 0.8 and 10.1 cm3 K mol-1, respectively. The magnetic results are discussed in relation to other related mu-terephthalato dinuclear Cu(II) published compounds.

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

Chemistry is traditionally divided into organic and inorganic chemistry. HPLC of Formula: C6H11NO2. The former is the study of compounds containing at least one carbon-hydrogen bonds.In a patent，Which mentioned a new discovery about 3105-95-1

A new diastereoselective pathway for the total synthesis of (+)-dexoxadrol, first asymmetric synthesis of (-)-epi-dexoxadrol and formal synthesis of conhydrine and (+)-lentiginosine is presented using commercially available (-)-pipecolinic acid. The key reactions utilized are Sharpless asymmetric dihydroxylation and Wittig reaction. The paper further describes the study of effect of protecting groups on dihydroxylation of a terminal olefin in piperidine ring system.

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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， Recommanded Product: 6,6′-Dimethyl-2,2′-bipyridine, Which mentioned a new discovery about 4411-80-7

The stability of a variety of bidentate N-base adducts of MoO 2Cl2 and (CH3)ReO3 (MTO) was investigated in thf and CH2C12 as solvents. The formation constants were determined from the spectrophotometric data based on 1:1 adduct formation. The adduct formation constants for [MoO2Cl 2L2](L2 = bidentate nitrogen ligand) are 104-106 times higher than those for [(CH 3)ReO3L2] with the same ligands under the same conditions. The adduct stability of both systems is very sensitive to the electronic nature of the ligands and increases with their donor ability. Hammett correlations of the formation constants against sigmagive relatively large negative values for the reaction constants (pRe = -5.9, p Mo = -6.6). The stability is also governed by steric and strain factors. Thus, sterically hindered 6,6′-disubstituted 2,2′ -bipyridines do not form ad ducts with MTO, and only 6,6′-dimethyl- and 6,6′-diphenyl- 2,2′-bipyridines form adducts with MoO2Cl2. However, these adducts are much less stable than other methyl derivatives of 2,2′-bipridine adducts. The steric strain between the two methyl groups in 3,3-dimethy 1-2,2′-bipyridine influences the bipyridine planarity upon complexation and reduces the adduct stability. The thermodynamic parameters (enthalpy and entropy) were determined from temperature-dependence studies. The adduct stability is mainly due to the strongly exothermic binding of the nitrogen-bidentate ligand. The entropy change is small and has little effect on adduct stability.Wiley-VCH Verlag GmbH & Co, KGaA.

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Reference：
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， category: catalyst-ligand, Which mentioned a new discovery about 2926-30-9

A one-step oxidative fluorination for carbon-fluorine bond formation from well-defined nickel complexes with oxidant and aqueous fluoride is presented, which enables a straightforward and practical 18F late-stage fluorination of complex small molecules with potential for PET imaging.

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

Synthetic Route of 20439-47-8, The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.20439-47-8, Name is (1R,2R)-Cyclohexane-1,2-diamine, molecular formula is C6H14N2. In a Article，once mentioned of 20439-47-8

The first bifunctional thiourea catalyzed asymmetric Michael addition reactions of nitroalkanes to 2-furanones are described. The highly functionalized gamma-lactones with two or three consecutive stereogenic carbons were obtained in high yields (up to 99%), high diastereoselectivities (up to >20: 1 dr) and enantioselectivities (up to >99% ee).

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Reference：
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， category: catalyst-ligand, Which mentioned a new discovery about 581-50-0

Polymerization initiators are produced by contacting elemental calcium metal with pyridine-type compounds.

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

Synthetic Route of 20439-47-8, The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.20439-47-8, Name is (1R,2R)-Cyclohexane-1,2-diamine, molecular formula is C6H14N2. In a Article，once mentioned of 20439-47-8

A novel chelating chiral bis(formamidine-urea) ligand was synthesized and used to prepare the corresponding Ni and Cu11 complexes. Spectroscopic and X-ray crystallographic analysis of the former revealed that the urea moiety of the acyclic tetradentate ligand is deprotonated and binds to the square-planar Ni2+ ion through amide nitrogen atoms. This complex showed quasi-reversible redox behavior in cyclic voltammetry, with E1/2 = 640 mV vs. Cp2Fe+/Cp2Fe corresponding to the NiIII/NiII couple. The Cu complex was shown by EPR spectroscopy to also adopt a square-planar geometry [g? = 2.25 (A? = 184 G), g? = 2.06 at 6 K], and reduction was found to be irreversible, perhaps due to the rigid nature of the tetradentate ligand. The nickel complex was found to be a modestly active catalyst for epoxidation of electron-rich alkenes under Mukaiyama’s conditions, likely involving a radical mechanism. Wiley-VCH Verlag GmbH & Co. KGaA, 2006.

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