Tag: M.W:300-400

Chemistry is an experimental science, and the best way to enjoy it and learn about it is performing experiments.Introducing a new discovery about 185449-80-3, Name is (S)-N,N-Dimethyldinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepin-4-amine, name: (S)-N,N-Dimethyldinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepin-4-amine.

Enantioselective synthesis of cis-fused cyclooctanoids via rhodium(I)-catalyzed [4 + 2 + 2] cycloadditions

Catalytic multicomponent [m + n + o]-type cycloadditions offer efficient, atom-economical routes to diverse complex carbocycles. Recently, such transformations have emerged as unique strategies for medium ring carbocycle synthesis. Despite the important developments in this area, however, highly enantioselective [m + n + o]-type processes accessing medium ring carbocycles have yet to be developed. Herein, a rhodium-catalyzed [4 + 2 + 2] cycloaddition of allenedienes with allenes enabling the direct stereoselective synthesis of cis-fused cyclooctanoids is reported. These cycloadditions are successful with a diverse range of -components and demonstrate the potential for high levels of enantioselectivity in a [4 + 2 + 2] process.

Balanced chemical reaction does not necessarily reveal either the individual elementary reactions by which a reaction occurs or its rate law.name: (S)-N,N-Dimethyldinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepin-4-amine. In my other articles, you can also check out more blogs about 185449-80-3

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Electric Literature of 14187-32-7. Let¡¯s face it, organic chemistry can seem difficult to learn. Especially from a beginner¡¯s point of view. Like 14187-32-7, Name is Dibenzo-18-crown-6. In a document type is Article, introducing its new discovery.

Synthesis and crystal structure of two-dimensional network DB18-C-6 complex: [Na(DB18-C-6)]2[Pt(SCN)6]

A novel dibenzo-18-crown-6 (DB18-C-6) complex [Na(DB18- C-6)]2[Pt(SCN)6] (1) has been synthesized and characterized by elemental analysis, IR spectrum and X-ray diffraction analysis. The complex belongs to triclinic, space group P-1 with cell dimensions: a = 1.2500(3), b = 1.2825(3), c = 1.9342(4) nm, alpha = 106.82(3), beta = 102.51(3), gamma = 103.04(3), V = 2.7562 nm3, Z = 2, Dcalcd = 1.579 g/cm3, F(000) = 1316, R1 = 0.0364, wR2 = 0.0771. The complex shows a two-dimensional network structure of [Na(DB18-C-6)]+ complex cations and [Pt(SCN)6]2- complex anion bridged by Na-N interactions between adjacent [Na(DB18-C-6)]+ and [Pt(SCN)6]2- units.

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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, name: Dibenzo-18-crown-6

IR spectroscopic study of scandium extraction from sulfuric acid by solid-phase extractants based on tributyl phosphate, di-2-ethylhexylphosphoric acid, dibenzo-18-crown-6, and their mixtures

Solid-phase extractants (TVEKS) containing tributyl phosphate (TBP, I), di-2-ethylhexylphosphoric acid (D2EHPA, II), dibenzo-18-crown-6 (DB18C6, III), and their mixtures were prepared. The extraction of scandium by these extradants from a sulfuric acid solution with a concentration of 6 mol/l was studied. It was found by IR spectroscopy that in the extraction of scandium by TVEKS-III the Sc3+ ions were incorporated into macrocycle cavities to form a host-guest complex. The extraction of scandium by TVEKS-I occurred by a hydration-solvation mechanism: [TBP¡¤H3O]x + [Sc(SO4)y]¡¤zHSO4 -. In the synthesis of TVEKS-II. the conformation of D2EHPA was changed because of a decrease in the water content without formation of chemical bonds between the extradant and the polymer matrix. Based on IR spectroscopic data, a conclusion on the cation-exchange mechanism of scandium extraction by TVEKS-II was drawn. In TVEKS-(III + II) and TVEKS-(III + I), the crown ether interacted with an organophosphorus compound to result in an antagonistic effect in the extraction of the metal ion.

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 14187-32-7 is helpful to your research., name: Dibenzo-18-crown-6

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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. 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

Nuclear magnetic resonance study of the stoichiometry and stability of several Li+-crown ether complexes in various acetonitrile-nitrobenzene mixtures

Lithium-7 NMR spectrometry was used to study the complexation reaction between lithium ions and several 12-, 15- and 18-membered crown ethers in a number of binary acetonitrile-nitrobenzene mixtures. Formation constants of the resulting 1:1 complexes in different solvent mixtures were determined by computer fitting of the chemical shift-mole ratio data. There is an inverse relationship between the complex stability and the amount of acetonitrile in the mixed solvent. Among different sized crown ethers used, 15-crowns were found to form the most stable Li+ complexes in the series. The influence of substitution on the macrocyclic rings on the stability of the resulting complexes is discussed.

Balanced chemical reaction does not necessarily reveal either the individual elementary reactions by which a reaction occurs or its rate law.Recommanded Product: 14187-32-7. In my other articles, you can also check out more blogs about 14187-32-7

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Synthetic Route of 39648-67-4, 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. 39648-67-4, C20H13O4P. A document type is Article, introducing its new discovery.

Organocatalytic C(sp3)-H Functionalization via Carbocation-Initiated Cascade [1,5]-Hydride Transfer/Cyclization: Synthesis of Dihydrodibenzo[b,e]azepines

Carbocation-initiated cascade [1,5]-hydride transfer/cyclization and dimerization reactions were developed to synthesize dihydrodibenzo[b,e]azepine and octahydrodipyrroloquinoline derivatives in high yields. These redox-neutral C(sp3)-H functionalization-involving cascade reactions feature transition-metal-free, high atom- and step-economy, and environmental friendliness with water as the sole byproduct.

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Related Products of 39648-67-4, An article , which mentions 39648-67-4, molecular formula is C20H13O4P. The compound – (R)-4-Hydroxydinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepine 4-oxide played an important role in people’s production and life.

HNTf2-Catalyzed Synthesis of Hydrodibenzofurans by an Epoxidation/Semipinacol Rearrangement Cascade

Described here is a highly efficient synthesis of hydrodibenzofurans, an important structural unit lacking general access, in particular, with contiguous quaternary stereocenters. In the presence of HNTf2 as the superior catalyst and mCPBA as an oxidant, the readily available styrene substrates underwent a one-pot cascade process comprising epoxidation, semipinacol rearrangement, and hemiketal formation to furnish hydrodibenzofurans with good efficiency and diastereoselectivity.

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Application of 14187-32-7, Catalysts are substances that increase the reaction rate of a chemical reaction without being consumed in the process. 14187-32-7, Name is Dibenzo-18-crown-6, molecular formula is C20H24O6. In a Article£¬once mentioned of 14187-32-7

Microwave-assisted synthesis of dibenzo-crown ethers

Microwave-assisted organic synthesis (MAOS) for dibenzo-substituted crown ethers is presented. Two routes were developed: (1) one-pot MAOS for symmetric dibenzo-crown ethers (DBC) and (2) a two-step MAOS via diphenol intermediates for both symmetric and asymmetric DBCs. MAOS were carried out in open or closed vessels, with or without temperature control at various microwave settings using different bases and reactants. Open vessel MAOS was limited by the volatility of reactants hence was less preferred than the closed vessel MAOS. DBC formation was highly affected by the cation size of the base, which acted as a template ion during DBCs ring closure. Closed vessel MAOS without temperature control was found most appropriate for DBC synthesis. Symmetric DBCs were conveniently obtained via one-pot MAOS whereas asymmetric DBCs were obtained from two-step MAOS via diphenol intermediates. The method was found expedient as it afforded satisfactory yields at considerably shorter reaction time than those in conventional methods.

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 14187-32-7 is helpful to your research., Application of 14187-32-7

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Reference of 14187-32-7, Catalysts are substances that increase the reaction rate of a chemical reaction without being consumed in the process. 14187-32-7, Name is Dibenzo-18-crown-6, molecular formula is C20H24O6. In a Article£¬once mentioned of 14187-32-7

Preparation of a Polymer-supported Diol and Its Use in isolating Aldehydes and Ketones from Mixtures and as a Protecting Group for Aldehydes and Ketones

Reaction of cross-linked chloromethylated polystyrenes with 3-mercaptopropane-1,2-diol and sodium hydroxide under phase-transfer conditions gave polymers containing diol residues.A range of aldehydes and ketones were successfully bound to these polymers via acetal formation.The aldehydes and ketones were released by treating the products with aqueous dioxane in the presence of toluene-p-sulphonic acid.The polymer-supported diol could be used to isolate aldehydes or ketones from mixtures with other compounds and to separate a 3-oxosteroid from a 17- or a 20- oxosteroid.The supported diol was successfully used to protect the aldehyde group of undec-10-enal whilst the terminal vinyl group was transformed into -CH2CH2OCOPh.Attempts to monoprotect dicarbonyl compounds were unsuccessful.

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 14187-32-7 is helpful to your research., Reference of 14187-32-7

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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. 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, Safety of (R)-4-Hydroxydinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepine 4-oxide

A facile synthesis of tris(indolyl)propanes by concerted 1,2- and 1,4-friedel-crafts attack of indoles to alpha,beta-unsaturated aldimines

The Friedel-Crafts reaction of indoles with a wide range of alpha,beta-unsaturated aldimines catalysed by binaphthyl phosphoric acid is demonstrated. The resulting tris(indolyl)propanes are presumably generated by a concerted 1,2- and 1,4-nucleophilic attack to the conjugated imines. According to the preliminary bioassay results, the compound 4e exhibits moderate activity against pancreatic cancer cells.

Balanced chemical reaction does not necessarily reveal either the individual elementary reactions by which a reaction occurs or its rate law.Safety of (R)-4-Hydroxydinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepine 4-oxide. In my other articles, you can also check out more blogs about 39648-67-4

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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. 14187-32-7, Name is Dibenzo-18-crown-6, molecular formula is C20H24O6. In a Article£¬once mentioned of 14187-32-7, COA of Formula: C20H24O6

Solid (dibenzo-18-crown-6)KC60: Significant enhanced air-stability and appearance of a strong 13C NMR signal of C60- below 200 K with an unexpected negative chemical shift

Two novel properties, which arise primarily from intermolecular interactions between two aryl rings of the crown ether and neighbouring C60-, are found in solid (dibenzo-18-crown-6)KC60, viz. significantly enhanced air-stability and appearance of a strong 13C NMR signal of C60- below 200 K with an unexpectedly negative chemical shift.

Balanced chemical reaction does not necessarily reveal either the individual elementary reactions by which a reaction occurs or its rate law.COA of Formula: C20H24O6. In my other articles, you can also check out more blogs about 14187-32-7

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