Tag: M.W:200-300

Chemistry is an experimental science, and the best way to enjoy it and learn about it is performing experiments.Introducing a new discovery about 4488-22-6, Name is [1,1′-Binaphthalene]-2,2′-diamine, Computed Properties of C20H16N2.

Ethene polymerization behavior of MAO-Activated dichloridotitanium complexes bearing Bi- and tetradentate salicylaldimine derivatives

New chiral bridged tetradentate (N2O2)Ti IVCl2-type complexes bearing dimethylbiphenyl (1-Ti-3-Ti) and previously published, binaphthyl-bridged (4-Ti) complex were synthesized, with high, yields. This was achieved by treating the corresponding Schiff-base ligand (H2L) precursors with Ti(NMe2)4, followed by conversion of these diamido complexes to LTiCl2 derivatives by the addition of excess of Me3SiCl. A. series of unbridged titanium, complexes S-Ti-8-Ti with similar substituents at the phenoxy group were studied and their polymerization properties, after methylaluminoxane (MAO) activation, compared with the above bridged complexes. It was found that the catalysts bearing chiral tetradentate biaryl-bridged salicylaldimine ligands produce multimodal polyethylene (PE) with low activity [below 1.0 kgPE/ (molTihbar)] while their unbridged analogues provide activities that are 10-1000 times greater under similar reaction conditions. The reasons for this dramatic difference in polymerization activities are discussed based, on the stabilities of the different cationic species configurations.

Balanced chemical reaction does not necessarily reveal either the individual elementary reactions by which a reaction occurs or its rate law.Computed Properties of C20H16N2. In my other articles, you can also check out more blogs about 4488-22-6

Reference£º
Chiral Catalysts,
Chiral catalysts – SlideShare

 

Reference of 33100-27-5. Chemistry is an experimental science, and the best way to enjoy it and learn about it is performing experiments.Introducing a new discovery about 33100-27-5, Name is 1,4,7,10,13-Pentaoxacyclopentadecane

Hydrogen Peroxide Coordination to Cobalt(II) Facilitated by Second-Sphere Hydrogen Bonding

M(H2O2) adducts have been postulated as intermediates in biological and industrial processes; however, only one observable M(H2O2) adduct has been reported, where M is redox-inactive zinc. Herein, direct solution-phase detection of an M(H2O2) adduct with a redox-active metal, cobalt(II), is described. This CoII(H2O2) compound is made observable by incorporating second-sphere hydrogen-bonding interactions between bound H2O2and the supporting ligand, a trianionic trisulfonamido ligand. Thermodynamics of H2O2binding and decay kinetics of the CoII(H2O2) species are described, as well as the reaction of this CoII(H2O2) species with Group 2 cations.

If you are hungry for even more, make sure to check my other article about 33100-27-5. Reference of 33100-27-5

Reference£º
Chiral Catalysts,
Chiral catalysts – SlideShare

 

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. 14098-44-3, C14H20O5. A document type is Article, introducing its new discovery., Quality Control of: Benzo-15-crown-5

Benzo- and dibenzo-crown ethers substituted with (azulene-1-yl) azo chromophores. Synthesis and properties

Colored benzo- and dibenzo-crown ethers with (azulene-1-yl) azo chromophores(s) at benzo ring(s) were synthesized in good yields starting from the amines of the benzo- and dibenzo-crown ethers which were diazotized and coupled with azulenes. The obtained crown ethers were characterized and several properties of the generated new dyes were investigated (electronic and NMR-spectra, as well as pKa values, the lipophilicity and the coordination with metal cations).

Interested yet? Keep reading other articles of 14098-44-3!, Quality Control of: Benzo-15-crown-5

Reference£º
Chiral Catalysts,
Chiral catalysts – SlideShare

 

The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.33100-27-5, Name is 1,4,7,10,13-Pentaoxacyclopentadecane, molecular formula is C10H20O5. In a Article£¬once mentioned of 33100-27-5, category: chiral-catalyst

Syntheses of nucleosides with 2?-spirolactam and 2?-spiropyrrolidine moieties as potential inhibitors of hepatitis C virus NS5B polymerase

To discover novel nucleosides as potential antiviral agents, 2?-spirolactam and 2?-spiropyrrolidine-containing nucleoside analogs were envisioned. Efficient synthetic routes were developed with an epoxide opening as the key step to establish the quaternary center at the 2? position, leading to the design and synthesis of uridine analogs 8 and 21, prodrugs 13-16, and cytidine analog 11.

The reactant in an enzyme-catalyzed reaction is called a substrate. Enzyme inhibitors cause a decrease in the reaction rate of an enzyme-catalyzed reaction.I hope my blog about 33100-27-5 is helpful to your research., category: chiral-catalyst

Reference£º
Chiral Catalysts,
Chiral catalysts – SlideShare

 

Chemistry is an experimental science, and the best way to enjoy it and learn about it is performing experiments.Introducing a new discovery about 7181-87-5, Name is 1,3-Dimethyl-1H-benzo[d]imidazol-3-ium iodide, Quality Control of: 1,3-Dimethyl-1H-benzo[d]imidazol-3-ium iodide.

Potent Inhibition of Thioredoxin Reductase by the Rh Derivatives of Anticancer M(arene/Cp*)(NHC)Cl2 Complexes

Metal complexes provide a versatile platform to develop novel anticancer pharmacophores, and they form stable compounds with N-heterocyclic carbene (NHC) ligands, some of which have been shown to inhibit the cancer-related selenoenzyme thioredoxin reductase (TrxR). To expand a library of isostructural NHC complexes, we report here the preparation of RhIII- and IrIII(Cp*)(NHC)Cl2 (Cp? = eta5-pentamethylcyclopentadienyl) compounds and comparison of their properties to the RuII- and OsII(cym) analogues (cym = eta6-p-cymene). Like the RuII- and OsII(cym) complexes, the RhIII- and IrIII(Cp*) derivatives exhibit cytotoxic activity with half maximal inhibitory concentration (IC50) values in the low micromolar range against a set of four human cancer cell lines. In studies on the uptake and localization of the compounds in cancer cells by X-ray fluorescence microscopy, the Ru and Os derivatives were shown to accumulate in the cytoplasmic region of treated cells. In an attempt to tie the localization of the compounds to the inhibition of the tentative target TrxR, it was surprisingly found that only the Rh complexes showed significant inhibitory activity at IC50 values of ?1 muM, independent of the substituents on the NHC ligand. This indicates that, although TrxR may be a potential target for anticancer metal complexes, it is unlikely the main target or the sole target for the Ru, Os, and Ir compounds described here, and other targets should be considered. In contrast, Rh(Cp*)(NHC)Cl2 complexes may be a scaffold for the development of TrxR inhibitors.

Balanced chemical reaction does not necessarily reveal either the individual elementary reactions by which a reaction occurs or its rate law.Quality Control of: 1,3-Dimethyl-1H-benzo[d]imidazol-3-ium iodide. In my other articles, you can also check out more blogs about 7181-87-5

Reference£º
Chiral Catalysts,
Chiral catalysts – SlideShare

 

Related Products of 14098-44-3, Chemistry can be defined as the study of matter and the changes it undergoes. You¡¯ll sometimes hear it called the central science because it is the connection between physics and all the other sciences, starting with biology.14098-44-3, Name is Benzo-15-crown-5, molecular formula is C14H20O5. In a patent, introducing its new discovery.

Ion-pair extraction of uranyl ion from aqueous medium using crown ethers

Ion-pair extraction behaviour of uranyl ion from aqueous solutions was studied at pH 3.0 employing crown ethers viz. benzo 15 crown 5 (B15C5), 18 crown 6 (18C6), dibenzo 18 crown 6 (DB18C6), and dibenzo 24 crown 8 (DB24C8) in chloroform as the organic phase and picric acid as the organophilic counter anion. The stoichiometry of the extracted species corresponded to [UO2(crown ether)(n)]2+ ¡¤[pic-]2 where n = 1.5 for benzo 15 crown 5 and 1 for 18 crown 6 as well as dibenzo 18 crown 6. Adducts of DB24C8 could not be observed as practically no extraction was possible using this reagent. The separation behaviour of fission products from an irradiated uranium target was also studied. An interesting observation on the separation of trivalent lanthanides from uranyl ion is reported.

If you are interested in 14098-44-3, you can contact me at any time and look forward to more communication.Related Products of 14098-44-3

Reference£º
Chiral Catalysts,
Chiral catalysts – SlideShare

 

33100-27-5, Name is 1,4,7,10,13-Pentaoxacyclopentadecane, molecular formula is C10H20O5, belongs to chiral-catalyst compound, is a common compound. In a patnet, once mentioned the new application about 33100-27-5, category: chiral-catalyst

Stereologous Crown Ethers: ?-Donor Participation in the Complexation of Cations?

In the framework of the “stereology concept” the new crown ethers 8, 9, and for comparison 11 have been synthesized and their stability constants with Ag+ ions determined by 1H NMR spectroscopy.The results may be interpreted as evidence for a ?-participation of aromatic nuclei of the ligands in the complexation of certain cations.

Balanced chemical reaction does not necessarily reveal either the individual elementary reactions by which a reaction occurs or its rate law.category: chiral-catalyst. In my other articles, you can also check out more blogs about 33100-27-5

Reference£º
Chiral Catalysts,
Chiral catalysts – SlideShare

 

A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 33100-27-5, Name is 1,4,7,10,13-Pentaoxacyclopentadecane, molecular formula is C10H20O5. In a Article£¬once mentioned of 33100-27-5, category: chiral-catalyst

Formoxylbenzo-15-crown-5 ether functionalized PVA/NWF composite membrane for enhanced 7Li+ enrichment

Few work focuses on the 7Li+ enrichment materials even though each Li isotope plays an important role in the nuclear industry. In this work, we present an efficient composite membrane for 7Li+ enrichment. The composite membrane was prepared using nonsolvent-induced phase separation (NIPS) method, obtained by casting the polymer polyvinyl alcohol (PVA) grafted formoxylbenzo-15-crown-5 (FB15C5) (PVA-g-FB15C5) in DMSO solution on non-woven fabrics (NWF). The composite membrane exhibited a large amount of sponge-like structure with the average pore diameter of 0.36 mum. The dynamic liquid?solid extraction results clearly indicated that the distribution coefficient (Kd) increased dramatically from 136 to 175 mL g?1 with an increase of crown ether immobilization amount from 0.76 to 2.13 mmol g?1, and the equilibrium separation factor (alpha) also increased significantly from 1.013 ¡À 0.002 to 1.065 ¡À 0.002, which is much higher than that obtained using FB15C5 by the liquid?liquid extraction (1.022 ¡À 0.002) and non-porous PVA-g-FB15C5 film via liquid?solid static extraction (1.046 ¡À 0.002). More importantly, 7Li+ concentrated on the composite membrane as a result of the enhanced electron density of the crown ether after grafted onto PVA. In a word, the functional composite membrane exhibits an attractive application potential in the development of green and highly efficient membrane chromatography for lithium isotope adsorptive separation.

Sometimes chemists are able to propose two or more mechanisms that are consistent with the available data.category: chiral-catalyst, If a proposed mechanism predicts the wrong experimental rate law, however, the mechanism must be incorrect.Welcome to check out more blogs about 33100-27-5, in my other articles.

Reference£º
Chiral Catalysts,
Chiral catalysts – SlideShare

 

The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.33100-27-5, Name is 1,4,7,10,13-Pentaoxacyclopentadecane, molecular formula is C10H20O5. In a Article£¬once mentioned of 33100-27-5, SDS of cas: 33100-27-5

ETUDE CRISTALLOGRAPHIQUE ET PAR RPE DU DIAQUA(15-COURONNE-5 ETHER) CUIVRE(II) NITRATE

The crystallographic structure of diaqua (pentaoxa 1,4,7,10,13 cyclopentadecane)Copper(II)nitrate ((NO3)2) has been established by three-dimensional X-ray analysis from diffractometer data.The compoud is monoclinic (space group Pc) with a=14.758(5), b=13.978(4), c=43.914(13) Angstroem, beta=102.19(3) degree, Z=20 (10 independent molecules).Copper admits coordination number SEVEN (5 oxygen atoms from the crown-ether and two water molecules).The ten independent units are very similar and their differences consist mainly in their orientations.The ESR parameters of the compound were measured at ambient temperature on a single crystal.One found, as g-molecular values: g1=2.36, g2=2.35, g3=2.00. These values as well as the optical absorption bands could be reproduced within the framework of an AOM calculation with the following parameters: (e?)ocycle = -4600 cm-1, (e?)oH2O = -5300 cm-1, e?c/e?s = e?s/e? = 0.2; k1 = k2 = 0.94, k3 = 1. Key-Words ESR, Copper(II), pentaoxa 1,4,7,10,13 cyclopentadecane, 15-crown-5-ether

Note that a catalyst decreases the activation energy for both the forward and the reverse reactions and hence accelerates both the forward and the reverse reactions.SDS of cas: 33100-27-5, you can also check out more blogs about33100-27-5

Reference£º
Chiral Catalysts,
Chiral catalysts – SlideShare

 

The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.33100-27-5, Name is 1,4,7,10,13-Pentaoxacyclopentadecane, molecular formula is C10H20O5. In a Article£¬once mentioned of 33100-27-5, Product Details of 33100-27-5

Isotope effects in nucleophilic substitution reactions. VII. The effect of ion pairing on the substituent effects on SN2 transition state structure

The secondary alpha-deuterium kinetic isotope effects and substituent effect found in the SN2 reactions between a series of para-substituted sodium thiophenoxides and benzyldimethylphenylammonium ion are significantly larger when the reacting nucleophile is a free ion than when it is a solvent-separated ion pair comlex.Tighter transition states are found when a poorer nucleophile is used in both the free ion and ion pair reactions.Also, the transition states for all but one substituent are tighter for the reactions with the solvent-separated ion pair complex than with the free ion.Hammett delta values found by changing the substituent on the nucleophile do not appear to be useful for determining the length of the sulfur-alpha-carbon bond in the ion pair and free ion transition states.Key words: Isotope effects, ion pairing, nucleophilic substitution, SN2 reactions, transition states.

Note that a catalyst decreases the activation energy for both the forward and the reverse reactions and hence accelerates both the forward and the reverse reactions.Product Details of 33100-27-5, you can also check out more blogs about33100-27-5

Reference£º
Chiral Catalysts,
Chiral catalysts – SlideShare