Category: chiral-catalyst

The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.14187-32-7, Name is Dibenzo-18-crown-6, molecular formula is C20H24O6. In a Article£¬once mentioned of 14187-32-7, Safety of Dibenzo-18-crown-6

Influence of Polyethers on Properties of Aluminum Dust

A study was made of the dispersing and modifying action of perfluorinated oligopropylene oxide and dibenzo-18-crown-6 ether on aluminum powders being milled in a ball mill used for preparing highly reactive powders.

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Application of 21436-03-3, An article , which mentions 21436-03-3, molecular formula is C6H14N2. The compound – (1S,2S)-Cyclohexane-1,2-diamine played an important role in people’s production and life.

Highly enantioselective fluorescent recognition of mandelic acid derivatives by chiral salen macrocycles

Calixarene-like chiral salen macrocycles can be used for the enantioselective fluorescent recognition of mandelic acid derivatives. It was observed that one enantiomer of mandelic acid causes a 28-fold increase in the fluorescence intensity of a chiral salen macrocycle, whereas the other enantiomer causes only a 14-fold fluorescence enhancement. This highly enantioselective fluorescent response makes chiral salen macrocycles useful for the enantioselective fluorescent recognition of some mandelic acid derivatives.

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In an article, published in an article, once mentioned the application of 1806-29-7, Name is 2,2-Biphenol,molecular formula is C12H10O2, is a conventional compound. this article was the specific content is as follows.Recommanded Product: 2,2-Biphenol

(1)H NMR study of deprotonation and complexation of 2,2′-dihydroxybiphenyl derivatives

Deprotonation and complexation with gallium ion Ga(III) of 2,2′-dihydroxybiphenyl derivatives were studied by (1)H NMR.The pH dependence observed for chemical shifts of aromatic protons allowed us to obtain pKA1 and pKA2 values.Conformational effects for compounds bearing amide groups were described.Coalescence of methyl signals for pH < pKA2 was explained on the basis of intramolecular interactions through hydrogen bond.Spectra of the complexes for ligands containing amide groups with gallium ions showed that the coordination was unsymmetric and of the "salicylate" type. Do you like my blog? If you like, you can also browse other articles about this kind. Recommanded Product: 2,2-Biphenol. Thanks for taking the time to read the blog about 1806-29-7

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The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.14187-32-7, Name is Dibenzo-18-crown-6, molecular formula is C20H24O6. In a Article£¬once mentioned of 14187-32-7, Recommanded Product: 14187-32-7

Microhydration effects on the encapsulation of potassium ion by dibenzo-18-crown-6

We have measured electronic and conformer-specific vibrational spectra of hydrated dibenzo-18-crown-6 (DB18C6) complexes with potassium ion, K +?DB18C6?(H2O)n (n = 1-5), in a cold, 22-pole ion trap. We also present for comparison spectra of Rb +?DB18C6?(H2O)3 and Cs +?DB18C6?(H2O)3 complexes. We determine the number and the structure of conformers by analyzing the spectra with the aid of quantum chemical calculations. The K +?DB18C6?(H2O)1 complex has only one conformer under the conditions of our experiment. For K +?DB18C6?(H2O)n with n = 2 and 3, there are at least two conformers even under the cold conditions, whereas Rb+?DB18C6?(H2O)3 and Cs +?DB18C6?(H2O)3 each exhibit only one isomer. The difference can be explained by the optimum matching in size between the K+ ion and the crown cavity; because the K+ ion can be deeply encapsulated by DB18C6 and the interaction between the K+ ion and the H2O molecules becomes weak, different kinds of hydration geometries can occur for the K+?DB18C6 complex, giving multiple conformations in the experiment. For K+?DB18C6?(H 2O)n (n = 4 and 5) complexes, only a single isomer is found. This is attributed to a cooperative effect of the H2O molecules on the hydration of K+?DB18C6; the H2O molecules form a ring, which is bound on top of the K+?DB18C6 complex. According to the stable structure determined in this study, the K + ion in the K+?DB18C6?(H2O) n complexes tends to be pulled largely out from the crown cavity by the H2O molecules with increasing n. Multiple conformations observed for the K+ complexes will have an advantage for the effective capture of the K+ ion over the other alkali metal ions by DB18C6 because of entropic effects on the formation of hydrated complexes.

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Related Products of 1436-59-5. Let¡¯s face it, organic chemistry can seem difficult to learn. Especially from a beginner¡¯s point of view. Like 1436-59-5, Name is cis-Cyclohexane-1,2-diamine. In a document type is Article, introducing its new discovery.

Carbamoylphosphonate matrix metalloproteinase inhibitors 6: cis-2-aminocyclohexylcarbamoylphosphonic acid, a novel orally active antimetastatic matrix metalloproteinase-2 selective inhibitor-synthesis and pharmacodynamic and pharmacokinetic analysis

cis-2-Aminocyclohexylcarbamoylphosphonic acid (cis-ACCP) was evaluated in vitro and in two in vivo cancer metastasis models. It reduced metastasis formation in mice by ?90% when administered by a repetitive once daily dosing regimen of 50 mg/kg via oral or intraperitoneal routes and was nontoxic up to 500 mg/kg, following intraperitoneal administration daily for two weeks. Pharmacokinetic investigation of cis-ACCP in rats revealed distribution restricted into the extracellular fluid, which is the site of action for the antimetastatic activity and rapid elimination (t1/2 ? 19 min) from blood. Sustained and prolonged absorption (t1/2 ?126 min) occurred via paracellular mechanism along the small and large intestine with overall bioavailability of 0.3%. The in vivo concentrations of cis-ACCP in the blood in rats was above the minimal concentration for antimetastatic/MMP- inhibitory activity, thus explaining the prolonged action following once daily administration. Finally, 84% of the intravenously administered cis-ACCP to rats was excreted intact in the urine.

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The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.14187-32-7, Name is Dibenzo-18-crown-6, molecular formula is C20H24O6. In a Article£¬once mentioned of 14187-32-7, Application In Synthesis of Dibenzo-18-crown-6

Synthesis and complexing property of four-bridged crownopaddlanes

A new series of crown compounds crownopaddlanes 3a-c bearing three cyclobutane rings were prepared by means of intramolecular [2+2] photocycloaddition of styrene derivatives. The yield of crownopaddlane 3b possessing five ethereal oxygen atoms was remarkably high 52% with the addition of sodium borofluoride in the photoreaction system. As this template effect suggests, 3b showed extraordinarily high Na+-selectivity with high efficiency on the liquid-liquid extraction of alkali metal picrates, though 3a having four ethereal oxygen atoms did not extracted any cations in this system. The high Na+-selectivity of 3b was further clarified by the equilibrium stability constants (log Ka) for Na+ (5.85) and K+ (2.91) in acetonitrile solution. The complexation of 3b to Na+ cation was also examined by X-ray crystallography. Crownopaddlane 3c bearing six ethereal oxygen atoms also efficiently and selectively extracted alkali metal cations, compared with conventional 18-crown-6 derivatives.

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The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.21436-03-3, Name is (1S,2S)-Cyclohexane-1,2-diamine, molecular formula is C6H14N2. In a Article£¬once mentioned of 21436-03-3, category: chiral-catalyst

Enantioselective Michael addition of alpha,alpha-disubstituted aldehydes to maleimides organocatalyzed by chiral primary amine-guanidines

New primary amine-guanidines derived from the monoguanylation of (1S,2S)- and (1R,2R)-cyclohexane-1,2-diamine have been prepared and used as chiral organocatalysts for the enantioselective conjugate addition of alpha,alpha-disubstituted aldehydes to maleimides. The corresponding Michael adducts bearing a new stereocenter were generally obtained in high or quantitative yields and with good enantioselectivities (up to 93% ee).

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In an article, published in an article, once mentioned the application of 39648-67-4, Name is (R)-4-Hydroxydinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepine 4-oxide,molecular formula is C20H13O4P, is a conventional compound. this article was the specific content is as follows.SDS of cas: 39648-67-4

PROCESS FOR THE PREPARATION OF ENCLOMIPHENE CITRATE HAVING NEEDLE SHAPED CRYSTAL HABIT.

The present invention relates an improved and well reproducible process for the preparation of Enclomiphene citrate having needle shaped crystal habit, and moreover, it is also related to a solid form of Enclomiphene citrate.

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In an article, published in an article, once mentioned the application of 1436-59-5, Name is cis-Cyclohexane-1,2-diamine,molecular formula is C6H14N2, is a conventional compound. this article was the specific content is as follows.SDS of cas: 1436-59-5

Intermetallic bonds in metallophilic mercuraazametallamacrocycles of synthetic design

22-Membered mercuraazametallamacrocycles 6, 7, and 12 have been synthesized by dipodal condensation (2 + 2) of bis(o-formylphenyl)mercury (11) and 1,2-disubstituted amines. Reduction of macrocycle 6 with sodium borohydride afforded novel 11-membered mercuraazametallamacrocycle 13. Macrocycle 6, when treated with [Cu(CH3CN)4]ClO4 and Cu(OCOCH 3)2/NH4PF6, formed orange-colored CuI complexes 14 ([6¡¤Cu]ClO4) and 15 ([6¡¤Cu]PF6), respectively, whereas red-colored complex 16 ([12¡¤Cu]ClO4) was obtained from the reaction of 12 with [Cu(CH3CN)4]ClO4. Similarly, complexes 17 ([6¡¤Ag]ClO4) and 18 ([6¡¤Ag]PF6) were synthesized by the reaction of 6 with the corresponding silver salts. The reaction of 6 with Hg(OCOCH3)2/NH4PF 6 led to the formation of hydroxo-bridged complex 19. The reaction of macrocycle 7 with Pd(C6H5CN)2Cl2 gave access to novel complex 9a. The macrocycles and the complexes have been characterized by elemental analysis, NMR (1H, 13C, 199Hg), fluorescence spectroscopy, and cyclic voltammetry. The molecular structures of organomercury precursors Hg{1-C6H 4-2-(CH2OH)}2 (10) and Hg{1-C6H 4-2-(CHO)}2 (11) and macrocycles 6, 7, and 12 show almost linear geometry around mercury; however, 13 shows a bent structure, i.e., significant deviation of the C-Hg-C angle from linearity. 22-Membered mercuraazametallamacrocycles 6, 7, and 12 are stabilized by secondary Hg…N intramolecular interaction and have an “hour-glass”-like conformation. The molecular structures of 14, 17, and 9a showed metallophilic interactions. The metal ions (CuI and AgI) are coordinated not only to the four nitrogens but also to two mercury atoms, forming a distorted octahedral geometry around the metal ions.

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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. 21436-03-3, C6H14N2. A document type is Article, introducing its new discovery., SDS of cas: 21436-03-3

Optically active dioxatetraazamacrocycles: Chemoenzymatic syntheses and applications in chiral anion recognition

Two new C2 and D2 symmetrical dioxatetraaza 18-membered macrocycles [(R,R)-1 and (S,S,S,S)-2] are efficiently synthesized in enantiomerically pure forms by a chemoenzymatic method starting from (¡À)-trans-cyclohexane-1,2-diamine. The protonation constants and the binding constants with different chiral dicarboxylates are determined in aqueous solution by means of pH-metric titrations. The triprotonated form of (S,S,S,S)-2 shows moderate enantioselectivity with malate and tartrate anions (DeltaDeltaG = 0.62 and 0.66 kcal mol-1, respectively), being the strongest binding observed in both cases with the L enantiomer. Good enantiomeric discrimination is obtained with tetraprotonated (R,R)-1 and N-acetyl aspartate, the complex with the D-enantiomer being 0.92 kcal mol-1 more stable than its diastereomeric counterpart. Despite the lack of enantioselectivity of tri-and tetraprotonated (R,R)-1 for the tartrate anion, a very good diastereopreference for meso-tartrate is found. All these experimental results allow us to propose a model for the host-guest structure based on coulombic interactions and hydrogen bonds.

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