Day: March 8, 2021

The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.4488-22-6, Name is [1,1′-Binaphthalene]-2,2′-diamine, molecular formula is C20H16N2. In a Article£¬once mentioned of 4488-22-6, Quality Control of: [1,1′-Binaphthalene]-2,2′-diamine

The synthesis of homochiral hybrid diamines derived from 1,1?-binaphthyl-2,2?-diamine and alpha-amino acids

A convenient procedure for the preparation of homochiral diamines is presented. Coupling of racemic 1, 1?-binaphthyl-2,2?-diamine with natural N-protected amino acids afforded the corresponding diastereomeric precursors which, following chromatographic separation and deprotection, gave the desired products in good yields. These compounds, called herein hybrid compounds, possess two different stereogenic elements, i.e., the centre containing the L-amino acid residues and the C2 axis, resulting from the 1,1?-binaphthyl moiety. Georg Thieme Verlag Stuttgart.

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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.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

Phase Transition Enthalpy Measurements of Organic and Organometallic Compounds. Sublimation, Vaporization and Fusion Enthalpies From 1880 to 2015. Part 1. C1-C10

A compendium of phase change enthalpies published in 2010 is updated to include the period 1880-2015. Phase change enthalpies including fusion, vaporization, and sublimation enthalpies are included for organic, organometallic, and a few inorganic compounds. Part 1 of this compendium includes organic compounds from C1-C10. Part 2 of this compendium, to be published separately, will include organic and organometallic compounds from C11 to C192. Sufficient data are presently available to permit thermodynamic cycles to be constructed as an independent means of evaluating the reliability of the data. Temperature adjustments of phase change enthalpies from the temperature of measurement to the standard reference temperature, T = 298.15 K, and a protocol for doing so are briefly discussed.

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Electric Literature of 21436-03-3, 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.

Trans/cis isomerization of [RuCl2{H2CC(CH 2PPh2)2)}(diamine)] complexes: Synthesis, spectral, crystal structure and DFT calculations and catalytic activity in the hydrogenation of alpha,beta-unsaturated ketones

Three complexes of the general formula trans/cis-[Ru(II)(dppme) (NN)Cl2] {dppme is H2CC(CH2PPh 2)2 and NN is 1,2-diaminocyclohexane (trans/cis-(1)) and 1-methyl-1,2-diaminopropane (trans-(2)} were obtained by reacting trans-[RuCl2(dppme)2] with an excess amount of corresponding diamine in CH2Cl2 as a solvent. The complexes were characterized by an elemental analysis, IR, 1H, 13C and 31P{1H} NMR, FAB-MS and UV-visible. The trans-(1) (kinetic product) readily isomerizes to the cis-(1) (thermodynamic product) and this process was followed by using 31P{1H} NMR, cyclic voltammetry and UV-vis spectroscopy. The electrochemical studies on complex (1) reveal that the Ru(III)/Ru(II) couples are sensitive to the isomer (trans/cis) formed. The cis-(1) was confirmed by X-ray structure and 31P{ 1H} NMR. Transfer-hydrogenation reactions for reduction of trans-4-phenyl-3-butene-2-one were conducted using complexes trans/cis-(1) and trans-(2). The electronic spectra of cis/trans-(1) in dichloromethane were calculated with the use of time-dependent DFT methods.

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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. 21436-03-3, Name is (1S,2S)-Cyclohexane-1,2-diamine, molecular formula is C6H14N2. In a Article£¬once mentioned of 21436-03-3, name: (1S,2S)-Cyclohexane-1,2-diamine

Synthesis of 1,4-diazines by ring expansion of 1,3-diazines

Fully saturated piperazin-3-one and quinoxalin-3-one derivatives were prepared by reactions of 2-anilino-2-ethoxy-3-oxothiobutanoic acid anilide with aliphatic 1,2-diamines. An unusual ring expansion of the intermediate 1,3-diazines leads to 1,4-diazines. Moreover, quinoxalin-3-one derivatives from chiral trans-1,2-diaminocyclohexane were obtained with diastereoselectivity >95%.

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Related Products of 250285-32-6, An article , which mentions 250285-32-6, molecular formula is C27H37ClN2. The compound – 1,3-Bis(2,6-diisopropylphenyl)imidazolium chloride played an important role in people’s production and life.

Simple and Mild Synthesis of Indoles via Hydroamination Reaction Catalysed by NHC-Gold Complexes: Looking for Optimized Conditions

An efficient heterocyclization of 2-alkynylanilines to indole derivatives has been developed. The reaction proceeds under very mild conditions using small amounts of a gold precatalyst. A range of substrates possessing various functional groups were employed, and the substituted indoles were obtained in very good yields.

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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, SDS of cas: 14187-32-7

Complexation of macrocyclic compounds with metal ions: 2. Mg(II), Ca(II), Sr(II), Ba(II), Cu(II), and Ag(I) in 20 mass % propylene carbonate + ethylene carbonate

The conductance behavior of magnesium, calcium, strontium, barium, copper, and silver perchlorates and their complexes with seven crown ethers have been studied in 20 mass % propylene carbonate + ethylene carbonate. The conductance studies indicate 1:1 complex formation between the metal ion and crown ether. For the alkaline earth metal ions, the order of stability constants with all crown ethers is found to be Mg(II) > Ca(II) > Sr(II) > Ba(II). The limiting ionic conductivities of metal ions and the complexed metal ions are also reported. In addition, complexation studies of Cu(II) and Ag(I) were carried out by potentiometry and voltammetry to compare the results with those obtained by conductivity measurements, which were found to be in good agreement with each other.

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14098-44-3, Name is Benzo-15-crown-5, molecular formula is C14H20O5, belongs to chiral-catalyst compound, is a common compound. In a patnet, once mentioned the new application about 14098-44-3, SDS of cas: 14098-44-3

Syntheses, crystal structures and electrochemical properties of two new supramolecular compounds based on hexamolybdates and crown ethers

Two new supramolecular compounds based on hexamolybdates and crown ethers, [Na(Benzo-15-crown-5)(H2O)(CH3CN)]2Mo6O19 1 and [Na(Dicyclohexyl-18-crown-6)]2Mo6O19 2 have been synthesized and characterized by elemental analysis, IR, TG, single crystal X-ray diffraction and electrochemical analysis. There are dominantly the electrostatic interactions between the crown ether-Na+ complex cations and the Mo6O192- polyanions in the compounds. In 2, the Mo6O192- anions are packed in the AB…AB layers along the c axis and the nearest Ot…Ot distances of neighboring Mo6O192- anions in the A layers are shorter than those in the B layers. The POM-crown ether supramolecular compounds have been used as the bulk-modifier to fabricate the chemically modified carbon paste electrodes (MCPE) successfully. They display well-defined cyclic voltammograms with three two-electron reversible redox couples in acidic aqueous solution, electrocatalytic activities toward the reduction of hydrogen peroxide and good stability due to their insolubility.

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Related Products of 250285-32-6, Catalysts are substances that increase the reaction rate of a chemical reaction without being consumed in the process. 250285-32-6, Name is 1,3-Bis(2,6-diisopropylphenyl)imidazolium chloride, molecular formula is C27H37ClN2. In a Article£¬once mentioned of 250285-32-6

Activation of Michael Acceptors by Halogen-Bond Donors

Extending earlier studies on iodine catalysis, experimental investigations show that various halogen-bond donors can also be employed to accelerate the Michael addition between trans -crotonophenone and indole. Solvent as well as counteranion effects have been analyzed, and kinetic and computational investigations provide additional insights into the mode of activation.

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Application 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.

Photophysical properties of 2,2′- and 4,4′-biphenyldiols

The photophysical properties of 2,2′- and 4,4′-biphenyldiols were investigated in aqueous and various organic solvents using optical absorption, steady-state and time-resolved fluorescence measurements. The investigated properties were correlated with the prototropic equilibria between the neutral, monoanionic and dianionic forms of the biphenyldiols. The monoanionic form of 2,2′-biphenyldiol is found to be exceptionally stable and shows interesting solvatochromism in polar protic and aprotic solvents. In solvents having appreciable proton-accepting power, 2,2′-biphenyldiol undergoes deprotonation, causing the coexistence of both the neutral and monoanionic forms in solutions. In presence of a strong proton acceptor, e.g. triethylamine, 2,2′-biphenyldiol undergoes complete deprotonation in a polar solvent like acetonitrile. In a nonpolar solvent, like cyclohexane, however, 2,2′-biphenyldiol forms ground-state intermolecularly hydrogen bonded complex with triethylamine. The photophysical properties of 2,2′-biphenyldiol have been found to be drastically different from those of 4,4′-biphenyldiol. The differences are explained on the basis of the presence and absence of intramolecular hydrogen bonding in the two compounds.

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Synthetic Route 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

Oxa-thia-, oxa-selena and crown ether macrocyclic complexes of tin(ii) tetrafluoroborate and hexafluorophosphate-synthesis, properties and structures

The reactions of Sn(BF4)2 and Sn(PF6) 2 with crown ethers and oxa-thia- or oxa-selena-macrocycles are complex, with examples of fragmentation of the fluoroanions, and cleavage of the ligands observed, in addition to adduct formation. The reaction of Sn(BF 4)2 with 15-crown-5 or 18-crown-6 produced the sandwich complex [Sn(15-crown-5)2][BF4]2 with 10-coordinate tin, and [Sn(18-crown-6)(H2O)][BF4] 2¡¤2H2O which has an hexagonal pyramidal tin centre with two long contacts to lattice water molecules (overall 7 + 2 coordination). [Sn(18-crown-6)(PF6)][PF6] is formed from 18-crown-6 and Sn(PF6)2, but the hexafluorophosphate ions hydrolyse readily in these systems to produce F- which coordinates to the tin to produce [Sn(18-crown-6)F][PF6], which can also be made directly from Sn(PF6)2, 18-crown-6 and KF in MeCN. The structure contains a hexagonal pyramidal coordinated Sn(ii) cation with an apical fluoride. The oxa-thia macrocycle [18]aneO4S2 forms [Sn([18]aneO4S2)(H2O)2(PF 6)][PF6], from which some crystals of composition [Sn([18]aneO4S2)(H2O)2(PF 6)]2[PF6][F] were obtained. The cation contains an approximately planar O4S2 coordinated macrocycle, with two coordinated water molecules on one side of the plane and a weakly bound (kappa2) PF6- group on the opposite face, and with the fluoride ion hydrogen bonded to the coordinated water molecules. In contrast, the oxa-selena macrocycle, [18]aneO4Se2, produces an anhydrous complex [Sn([18]aneO4Se2)(PF 6)2] which probably contains coordinated anions, although it decomposes quite rapidly in solution, depositing elemental Se, and hence crystals for an X-ray study were not obtained. Reacting Sn(BF4) 2 and [18]aneO4Se2 or [18]aneO 4S2 also causes rapid decomposition, but from the latter reaction crystals of the 1,2-ethanediol complex [Sn([18]aneO4S 2){C2H4(OH)2}][BF4] 2 were isolated. The structure reveals the coordinated macrocycle and a chelating diol, with the O-H protons of the latter hydrogen bonded to the [BF4]- anions. This is a very rare, structurally authenticated example of ring opening/cleavage of an oxa-thia macrocycle. The new complexes were characterised by microanalysis, IR, 1H, 19F{1H} and 31P{1H} NMR spectroscopy as appropriate, and X-ray structures are reported for [Sn(15-crown-5) 2][BF4]3[H3O]¡¤H2O, [Sn(18-crown-6)(H2O)][BF4]2¡¤2H 2O, [Sn(18-crown-6)F][PF6], [Sn([18]aneO4S 2)(H2O)2(PF6)]2[PF 6][F] and [Sn([18]aneO4S2){C2H 4(OH)2}][BF4]2. The complexes are compared and contrasted with chloro-tin(ii) complexes of crown ethers, germanium(ii) and lead(ii) analogues.

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