Category: chiral-catalyst

The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.39648-67-4, Name is (R)-4-Hydroxydinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepine 4-oxide, molecular formula is C20H13O4P. In a Article£¬once mentioned of 39648-67-4, HPLC of Formula: C20H13O4P

Asymmetric rearrangement of racemic epoxides catalyzed by chiral Br¡ãnsted acids

This paper describes a chiral Br¡ãnsted acid catalyzed asymmetric 1,2-rearrangement of racemic epoxides via a hydrogen-shift process for the synthesis of chiral aldehydes, and, followed by a reduction, a variety of optically active alcohols can be furnished in moderate yields with up to 50% ee. Especially, a facile one-pot synthesis of chiral alcohols directly from simple alkenes by a sequential epoxidation, rearrangement, and reduction has also been realized.

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 39648-67-4 is helpful to your research., HPLC of Formula: C20H13O4P

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Electric Literature of 1436-59-5, An article , which mentions 1436-59-5, molecular formula is C6H14N2. The compound – cis-Cyclohexane-1,2-diamine played an important role in people’s production and life.

A systematic study of the interactions between chemical partners (metal, ligands, counterions, and support) involved in the design of Al 2O3-supported nickel catalysts from diamine-Ni(II) chelates

1.5 Ni wt %/Al2O3 catalysts have been prepared by incipient wetness impregnation using [Ni(diamine)x(H 2O)6-2x]Y2 precursors (diamine = 1,2-ethanediamine (en) and trans-1,2-cyclohexanediamine (tc); x = 0, 1, and 2; Y = NO3- and Cl-), to avoid the formation, during calcination, of difficult-to-reduce nickel aluminate. N2 was chosen for thermal treatment to help reveal and take advantage of the reactions occurring between Ni2+, ligands, counterions, and support. In the case of [Ni(en)2(H2O)2]Y2 salts used as precursors, in situ UV-vis and DRIFT spectroscopies show that after treatment at 230AC Ni(II) ions are grafted to alumina via two OAl bonds and that the diamine ligands still remain coordinated to grafted nickel ions but in a monodentate way, bridging the cation with the alumina surface. With Y = Cl-, the chloride counterions desorb as hydrogen chloride, and hydrogen released upon decomposition of the en ligands is able to reduce a fraction of nickel ions into metal as evidenced by XPS. In contrast, with Y = NO3-, compounds such as CO or NO are formed during thermal treatment, indicating that nitrate ions burn the en ligands. After thermal treatment at 500AC, a surface phase containing Ni(II) ions forms, characterized by XPS and UV-vis spectroscopy. Temperature-programmed reduction shows that these ions can be quantitatively reduced to the metallic state at 500AC, in contrast with the aluminate obtained when the preparation is carried out from [Ni(H2O)6]2+, which is reduced only partly at 950AC. On the other hand, a total self-reduction of nickel complexes leading to 2-5-nm metal particles is obtained upon thermal treatment via the hydrogen released by a hydrogen-rich ligand such as tc, whatever the Y counterion. An appropriate choice of the ligand and the counterion allows then to obtain selectively Ni(II) ions or a dispersed reduced nickel phase after treatment in N2, as a result of the reactions occurring between the chemical partners present on alumina. A 2005 American Chemical Society.

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Electric Literature of 2133-34-8. Chemistry is an experimental science, and the best way to enjoy it and learn about it is performing experiments.Introducing a new discovery about 2133-34-8, Name is (S)-Azetidine-2-carboxylic acid

HETEROCYCLIC CETP INHIBITORS

Compounds of formula Ia and Ib [image] wherein A, B, C and R1 are described herein.

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In an article, published in an article, once mentioned the application of 21436-03-3, Name is (1S,2S)-Cyclohexane-1,2-diamine,molecular formula is C6H14N2, is a conventional compound. this article was the specific content is as follows.name: (1S,2S)-Cyclohexane-1,2-diamine

Cytotoxicity and Structural Analyses of 2,2?-Bipyridine-, 4,4?-Dimethyl-2,2?-bipyridine- and 2-(2?-Pyridyl)quinoxalineplatinum(II) Complexes

Platinum anticancer complexes incorporating 2,2?-bipyridine (bpy), 4,4?-dimethyl-2,2?-bipyridine (44Me2bpy) or 2-(2?-pyridyl)quinoxaline (2pq) as polyaromatic ligands and the S,S or R,R isomer of 1,2-diaminocyclohexane as ancillary ligands in the form [Pt(PL)(AL)]2+ have been synthesised and characterised. X-ray diffraction was used to elucidate the structure and stacking behaviour of the complexes, revealing interesting properties that may impact their biological activity. Pulsed gradient spin-echo NMR experiments elucidated the aggregation behaviour of these complexes in solution. The cytotoxicity of each complex was assessed against the L1210 murine leukaemia, HT29 human colon carcinoma and U87 human glioblastoma cell lines and compared to other complexes within this class. The complexes incorporating 44Me2bpy were found to be the most potent at inhibiting cell growth with IC50 values for the S,S isomer (0.13-0.5 muM) less than that for cisplatin (0.36-11 muM), oxaliplatin (0.9-1.8 muM) or carboplatin (>50 muM). Most complexes were found to be very effective against HT29 colon carcinoma cells.

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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, Quality Control of: 1,4,7,10,13-Pentaoxacyclopentadecane

Structure of *15-crown-5

Quality Control of: 1,4,7,10,13-Pentaoxacyclopentadecane. In my other articles, you can also check out more blogs about 33100-27-5

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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. 2133-34-8, Name is (S)-Azetidine-2-carboxylic acid, molecular formula is C4H7NO2. In a Patent£¬once mentioned of 2133-34-8, Computed Properties of C4H7NO2

HETEROCYCLYL COMPOUNDS FOR THE TREATMENT OF AUTOIMMUNE DISEASE

The present invention relates to compounds of formula (I), wherein R1 to R3, A and Q are as described herein, and their pharmaceutically acceptable salt, enantiomer or diastereomer thereof, and compositions including the compounds and methods of using the compounds.

Sometimes chemists are able to propose two or more mechanisms that are consistent with the available data.Computed Properties of C4H7NO2, If a proposed mechanism predicts the wrong experimental rate law, however, the mechanism must be incorrect.Welcome to check out more blogs about 2133-34-8, in my other articles.

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Related Products of 1806-29-7. Let¡¯s face it, organic chemistry can seem difficult to learn. Especially from a beginner¡¯s point of view. Like 1806-29-7, Name is 2,2-Biphenol. In a document type is Article, introducing its new discovery.

Chemoselective synthesis of new dibenzo[d,f]-1,3-dioxepines and 12H-dibenzo[dg]-1,3-dioxocines

A new series of dibenzodioxepine and dibenzodioxocine derivatives was prepared starting from aliphatic and aromatic aldehydes, underlining the chemoselectivity of both the catalyst and the biphenol, also confirming the importance of the hydrogen atom in a position to the carbonyl group.

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Related Products of 14187-32-7, 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. 14187-32-7, C20H24O6. A document type is Article, introducing its new discovery.

Syntheses of cis- and trans-dibenzo-30-crown-10 derivatives via regioselective routes and their complexations with paraquat and diquat

(Chemical Equation Presented) cis-Dibenzo-30-crown-10 (cis-DB30C10) diester and trans-dibenzo-30-crown-10 (trans-DB30C10) diester were synthesized regioselectively with reasonable yields. These two isomers were further reduced to cis-dibenzo-30-crown-10 diol (1) and trans-DB30C10 diol (2), respectively. The complexations of cis-and trans-DB30C10 diols with paraquat (3) and diquat (4) were investigated by 1H NMR, mass spectrometry, UV-vis spectroscopy, and single-crystal X-ray analysis. The reversible control of complexations of 1?3 and 2?3 by adding small molecules (KPF 6 and dibenzo-18-crown-6) was demonstrated by 1H NMR. The addition of 2 molar equiv of KPF6 is enough to dissociate 2?3 and 1?3 completely while the subsequent addition of 2 molar equiv of DB18C6 allows the two complexes to reform. However, 2 molar equiv of KPF6 cannot dissociate 1?4 and 2?4 completely. Because the DB30C10 cavity has a better geometry fit with paraquat 3 than with diquat 4, 4-based complexes have much higher association constants than the corresponding 3-based complexes. In the crystal structure of 1?4, the two hydroxymethyl groups of the crown ether 1 were joined by a “water bridge” to form a “supramolecular cryptand” while this kind of supramolecular cryptand structure was not observed in the crystal structure of 2?4. This is a possible reason for the increase in association constant from 2?4 (3.3 ¡Á 104 M-1) to 1?4 (5.0 ¡Á 104 M-1).

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Reference of 33100-27-5, Catalysts are substances that increase the reaction rate of a chemical reaction without being consumed in the process. 33100-27-5, Name is 1,4,7,10,13-Pentaoxacyclopentadecane, molecular formula is C10H20O5. In a Article£¬once mentioned of 33100-27-5

Molecular recognition of crown ethers by beta-lactose in aqueous solutions

Densimetric and viscosimetric measurements have been combined to conform the associate formation of beta-lactose with 15-crown-5 but not with 18-crown-6 in dilute aqueous solution.

The proportionality constant is the rate constant for the particular unimolecular reaction. the reaction rate is directly proportional to the concentration of the reactant. I hope my blog about 33100-27-5 is helpful to your research., Reference of 33100-27-5

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Synthetic Route of 1806-29-7, An article , which mentions 1806-29-7, molecular formula is C12H10O2. The compound – 2,2-Biphenol played an important role in people’s production and life.

METHOD FOR PRODUCING HYDROXYPHENYLCYCLOHEXANOL COMPOUND

A method comprising a step of stirring a composition containing a biphenol compound represented by the formula (1): wherein, R1 and R2 represent each independently an alkyl group having 1 to 3 carbon atoms, and m and n represent each independently an integer of 0 to 2, a secondary alcohol and a nickel catalyst, for producing a hydroxyphenylcyclohexanol compound represented by the formula (2): wherein, R1, R2, m and n represent the same meaning as described above, with the proviso that the above-described secondary alcohol has a different structure from that of the hydroxyphenylcyclohexanol compound represented by the above-described formula (2).

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