Tag: M.W:200-300

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Cooperative Reactivity in an Extended-Viologen-Based Cyclophane

A tetracationic pyridinium-based cyclophane with a box-like geometry, incorporating two juxtaposed alkyne functions, has been synthesized. The triple bonds are reactive through cycloadditions toward dienes and azides, promoted by the electron-withdrawing nature of the pyridinium rings, as well as by the strain inherent in the cyclophane. The cycloadditions proceeded in high yields, with the cyclophane reacting faster than its acyclic analogue. While the cyclophane contains two reactive triple bonds, there is no evidence for a stable monofunctional intermediate-only starting material and the difunctional product have been detected by 1H NMR spectroscopy. Molecular modeling of the energy landscape reveals a lower barrier for the kinetically favored second cycloaddition compared with the first one. This situation results in tandem cascading reactions within rigid cyclophanes, where reactions at a first triple bond induce increased reactivity at a distal second alkyne.

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.Related Products of 538-58-9, you can also check out more blogs about538-58-9

Reference£º
Synthesis and Crystal Structure of a Chiral?C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur¨Cnitrogen¨Coxygen ligand derived from aminothiourea and sodium?D-camphor-¦Â-sulfonate

538-58-9, Name is 1,5-Diphenylpenta-1,4-dien-3-one, belongs to chiral-oxygen-ligands compound, is a common compound. category: chiral-oxygen-ligandsIn an article, once mentioned the new application about 538-58-9.

REACTIONS OF 4,5-DIAMINO-3-METHYL-1-PHENYLPYRAZOLE WITH DIARYLIDENEACETONES

The reaction of 4,5-diamino-3-methyl-1-phenylpyrazole with dibenzylideneacetone and its 4,4′-derivatives has been studied; the reactions lead to aromatic 1H-2,3-dihydropyrazolo<5,4-b>-1,5-diazepine derivatives.The reaction pathway has also been identified.

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

Reference£º
Synthesis and Crystal Structure of a Chiral?C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur¨Cnitrogen¨Coxygen ligand derived from aminothiourea and sodium?D-camphor-¦Â-sulfonate

The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.Recommanded Product: 1,5-Diphenylpenta-1,4-dien-3-one, Name is 1,5-Diphenylpenta-1,4-dien-3-one, molecular formula is C17H14O, Recommanded Product: 1,5-Diphenylpenta-1,4-dien-3-one. In a Article, authors is Al-Majid, Abdullah Mohammed£¬once mentioned of Recommanded Product: 1,5-Diphenylpenta-1,4-dien-3-one

Synthesis of pyridine-dicarboxamide-cyclohexanone derivatives: Anticancer and alpha-glucosidase inhibitory activities and in silico study

An efficient and practical method for the synthesis of 2,6-diaryl-4-oxo-N,N0-di(pyridin-2 -yl)cyclohexane-1,1-dicarboxamide is described in this present study, which occurs through a double Michael addition reaction between diamide and various dibenzalacetones. The reaction was carried out in dichloromethane (DCM) in the presence of 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU). The anticancer activities of the synthesized compounds were evaluated in several cancer cell lines, including MCF-7, MDA-MB-231, SAS, PC-3, HCT-116, HuH-7 and HepG2 cells. From these experiments, we determined that MDA-MB-231 was the most sensitive cancer cell line to the compounds 3c, 3e, 3d, 3j and 3l, which exhibited variable anticancer activities (3l [IC50 = 5 ¡À 0.25 muM] > 3e [IC50 = 5 ¡À 0.5 muM] > 3c [IC50 = 7 ¡À 1.12 muM] > 3d [IC50 = 18 ¡À 0.87 muM] > 3j [IC50 = 45 ¡À 3 muM]). Of these, 3l (substituted p-trifluoromethylphenyl and chloropyridine) showed good potency (IC50 = 6 ¡À 0.78 muM) against HCT-116 colorectal cancer cells and exhibited high toxicity against HuH-7 liver cancer cells (IC50 = 4.5 ¡À 0.3 muM). These values were three times higher than the values reported for cisplatin (IC50 of 8 ¡À 0.76 and 14.7 ¡À 0.5 muM against HCT-116 and HuH-7 cells, respectively). The highest a-glucosidase inhibitory activity was detected for the 3d, 3i and 3j compounds. The details of the binding mode of the active compounds were clarified by molecular docking studies.

Sometimes chemists are able to propose two or more mechanisms that are consistent with the available data. Recommanded Product: 1,5-Diphenylpenta-1,4-dien-3-one, If a proposed mechanism predicts the wrong experimental rate law, however, the mechanism must be incorrect.Welcome to check out more blogs about 538-58-9, in my other articles.

Reference£º
Synthesis and Crystal Structure of a Chiral?C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur¨Cnitrogen¨Coxygen ligand derived from aminothiourea and sodium?D-camphor-¦Â-sulfonate

Synthetic Route of 538-58-9, 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. Synthetic Route of 538-58-9, C17H14O. A document type is Article, introducing its new discovery.

Pd-aminoclay nanocomposite as an efficient recyclable catalyst for hydrogenation and suzuki cross coupling reactions

A highly water dispersible Pd-aminoclay nanocomposite is found to be effective catalytic system for the hydrogenation of alpha,beta-unsaturated carbonyl compounds and Suzuki coupling reactions in aqueous media. The catalytic hydrogenation of alpha,beta-unsaturated carbonyl compounds proceeds at room temperature to afford the corresponding products in excellent yields with high chemoselectivity. The cross coupling of aryl bromides and iodides with aryl boronic acids proceeds efficiently under aqueous conditions at 90 C to afford the corresponding biaryls in excellent yields with high selectivity. The Suzuki reaction proceeds smoothly even in the absence of external base due to the basic nature of the catalyst support. The catalyst could be easily recovered and recycled three times without a significant loss of activity in hydrogenation and Suzuki cross coupling reactions. Copyright

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Reference£º
Synthesis and Crystal Structure of a Chiral?C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur¨Cnitrogen¨Coxygen ligand derived from aminothiourea and sodium?D-camphor-¦Â-sulfonate

Application of 538-58-9, Chemistry is the science of change. But why do chemical reactions take place? Why do chemicals react with each other? The answer is in thermodynamics and kinetics.In a document type is Article, and a compound is mentioned, 538-58-9, 1,5-Diphenylpenta-1,4-dien-3-one, introducing its new discovery.

Poly(N,N’-dibromo-N-ethyl-benzene-1,3-disulfonamide), N,N,N’,N’- tetrabromobenzene-1,3-disulfonamide as new reagents for conjugate addition of indole, pyrrole with a,b-unsaturated ketones

Poly(N,N’-dibromo-N-ethyl-benzene-1,3-disulfonamide) [PBBS] and N,N,N’,N’-tetrabromobenzene-1,3- disulfonamide[TBBDA] were used as efficient reagents for conjugate addition of indole and pyrrole with a,b-unsaturated ketones and also, double-conjugate 1,4-addition of indoles to dibenzylidenacetones. Iranian Chemical Society 2012.

The prevalence of solvent effects in heterogeneous catalysis in condensed media has motivated developing quantitative kinetic, spectroscopic, and theoretical assessments of solvent structuresyou can also check out more blogs about538-58-9 . Application of 538-58-9

Reference£º
Synthesis and Crystal Structure of a Chiral?C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur¨Cnitrogen¨Coxygen ligand derived from aminothiourea and sodium?D-camphor-¦Â-sulfonate

Reference of 538-58-9, Catalysts function by providing an alternate reaction mechanism that has a lower activation energy than would be found in the absence of the catalyst. In some cases, the catalyzed mechanism may include additional steps.In a article, 538-58-9, molcular formula is C17H14O, introducing its new discovery.

Direct Formation of Reactive Alkynyltrichlorotins from 1-Alkynes, SnCl4, and Bu3N. A Mild Alkynylation Reagent of Aldehydes, Acetals, and Enones

A reagent system of 1-alkyne, SnCl4, and Bu3N alkynylates aldehydes, acetals,and enones under mild reaction conditions giving acetylenic alcohols, acetylenic ethers, and acetylenic ketones, respectively, in high yields.Alkynyltrichlorotins are shown to be the reactive species for these reactions.

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Reference£º
Synthesis and Crystal Structure of a Chiral?C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur¨Cnitrogen¨Coxygen ligand derived from aminothiourea and sodium?D-camphor-¦Â-sulfonate

The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.category: chiral-oxygen-ligands, Name is 1,5-Diphenylpenta-1,4-dien-3-one, molecular formula is C17H14O, category: chiral-oxygen-ligands. In a Article, authors is Hussain, Sohair Mohamed£¬once mentioned of category: chiral-oxygen-ligands

SYNTHESIS OF SOME 5H-PYRANO- AND 5H-PYRIDO<2',3':4,5>PYRIDO<2,1-b>BENZOTHIAZOL-5-ONE DERIVATIVES

The addition reactions of 3-hydroxy-1H-pyrido<2,1-b>benzothiazol-1-one, 1, have been investigated.Thus, 1 added to aryl isocyanates to give the 2-carbamoyl derivatives 2a,b and to activated alkenes to give the 2-alkylated derivatives 5a-c.Compound 1 reacted also with alpha-substituted cinnamonitriles, 6a-l, to give different products 7, 12, 13 and 15 according to the nature of the substituent in 6.Compounds with the ring systems pyrido<2',3':4,5>pyrido<2,1-b>benzothiazole and pyrano<2',3':4,5>pyrido<2,1-b>benzothiazole have been obtained.The first ring system is a new one.

One of the oldest and most widely used commercial enzyme inhibitors is aspirin, category: chiral-oxygen-ligands, which selectively inhibits one of the enzymes involved in the synthesis of molecules that trigger inflammation. you can also check out more blogs about 538-58-9

Reference£º
Synthesis and Crystal Structure of a Chiral?C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur¨Cnitrogen¨Coxygen ligand derived from aminothiourea and sodium?D-camphor-¦Â-sulfonate

Synthetic Route of 538-58-9, Because a catalyst decreases the height of the energy barrier, its presence increases the reaction rates of both the forward and the reverse reactions by the same amount.538-58-9, Name is 1,5-Diphenylpenta-1,4-dien-3-one, molecular formula is C17H14O. In a article£¬once mentioned of 538-58-9

Wavelength dependent phototransformation of dibenzylideneacetonedibromide

Dibenzylideneacetonedibromide (1) gives three different products 2, 3 and 4, when its solution in chloroform is irradiated by electromagnetic radiation at different wavelengths. The structures of these products have been confirmed by spectral analysis or co-TLC and mixed m.p. with authentic samples.

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Reference£º
Synthesis and Crystal Structure of a Chiral?C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur¨Cnitrogen¨Coxygen ligand derived from aminothiourea and sodium?D-camphor-¦Â-sulfonate

The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.HPLC of Formula: C17H14O, Name is 1,5-Diphenylpenta-1,4-dien-3-one, molecular formula is C17H14O, HPLC of Formula: C17H14O. In a Article, authors is Yi, Wen-Bin£¬once mentioned of HPLC of Formula: C17H14O

One-pot fluorination followed by Michael addition or Robinson annulation for preparation of alpha-fluorinated carbonyl compounds

Fluorination followed by the Michael addition or Robinson annulation of 1,3-dicarbonyl compounds is introduced for the synthesis of acyclic and cyclic alpha-fluoro-beta-ketoesters and alpha-fluoro-1,3-diketones. The decarboxylation step can also be added to the reaction sequence. High efficiency is achieved by the microwave heating and atom economic one-pot synthesis.

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Reference£º
Synthesis and Crystal Structure of a Chiral?C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur¨Cnitrogen¨Coxygen ligand derived from aminothiourea and sodium?D-camphor-¦Â-sulfonate

Electric Literature of 538-58-9, Chemistry is the science of change. But why do chemical reactions take place? Why do chemicals react with each other? The answer is in thermodynamics and kinetics.In a document type is Article, and a compound is mentioned, 538-58-9, 1,5-Diphenylpenta-1,4-dien-3-one, introducing its new discovery.

REACTION OF SELENONIUM KETO YLIDE WITH DIBENZYLIDENE DERIVATIVES OF KETONES

The reaction of selenium monoketo ylides with the dibenzylidene derivatives of ketones (acetone, cyclopentanone, cyclohexanone) only takes place at one double bond of the dienone by a mechanism of the <1+2>-cycloaddition type with the formation of two isomeric cyclopropyl ketones.In the case of the dibenzylidene derivative of bicyclo<3.3.1>nonan-3-one the type of reaction, i.e., <1+2>– or <1+4>-cycloaddition, is determined by the direction of attack by the selenonium ylide (axial or equatorial).

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Reference£º
Synthesis and Crystal Structure of a Chiral?C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur¨Cnitrogen¨Coxygen ligand derived from aminothiourea and sodium?D-camphor-¦Â-sulfonate