Category: 14187-32-7

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, Formula: C20H24O6

Modified Crown Ether Catalysts. 2. Synthesis of Alkanoyl-, Aroyl-, alpha-Hydroxyalkyl- and Alkylbenzo and Alkylcyclohexano Crown Ethers

Improved procedures for the synthesis and purification of alkanoyl- and aroylbenzo crown ethers are reported.Several new alkanoyl- and alpha-hydroxyalkylbenzo crown ethers were prepared.Alkylbenzo crown ethers were prepared in high yield by the Raney nickel catalyzed hydrogen-transfer reductions of the corresponding acyl- or hydroxyalkylbenzo crown ether compounds.The reduction of the tosylhydrazones of acylbenzo crown ethers with sodium borohydride in acetic acid also yielded the corresponding alkyl derivate.Attempted reduction of the acyl- and alpha-hydroxyalkylbenzo crown ethers by catalytic hydrogenation over palladium catalysts was unsuccessful apparently due to strong binding of the crown ethers to the catalyst.Alkylcyclohexano crown ethers were prepared by catalytic hydrogenation of the aromatic rings of the corresponding alkylbenzo crown ethers.

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14187-32-7, Name is Dibenzo-18-crown-6, molecular formula is C20H24O6, belongs to chiral-catalyst compound, is a common compound. In a patnet, once mentioned the new application about 14187-32-7, name: Dibenzo-18-crown-6

Equilibria in the B(C6F5)3-H2O system: Synthesis and crystal structures of H2O¡¤B(C6F5)3 and the anions [HOB(C6F5)3]- And [(F5C6)3B(mu-OH)B(C6F 5)3]-

Addition of water to the Lewis acid B(C6F5)3 gives the neutral compound H2O¡¤B(C6F5)3¡¤-2H 2O while the reaction between B(C6F6)3 and KOH-H2O in the presence of dibenzo-18-crown-6 gives [K(dibenzo-18-crown-6)]+[HOB(C6F5) 3]- which crystallises together with the adduct H2O¡¤B(C6F5)3; the new binuclear borate anion [(F5C6)3B(muOH)B(C6F 5)3]- is formed as a salt with the cation [Ir(eta5C5H5)(C8H 12)H]+ by addition of H2O to B(C6F5)3 in the presence of [Ir(eta5-C5H5)(C8H12)].

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4′,4”- AND 4′,5”-DI-sec-BUTYL-2,3:11,12-DIBENZO-18-CROWN-6 – AN IONOPHORE FOR MAGNESIUM IN NATURAL AND MODEL SYSTEMS

The ionophoric properties of the di-sec-butyl derivatives of dibenzo-18-crown-6 have been studied in natural and model membranes.It has be shown that the di-sec-butyl substituents in the benzene rings of dibenzo-18-crown-6 impart to the cyclopolyether the properties of an ionophore for magnesium.The Mg(2+)/Ca(2+) selectivity of the cyclopolyether investigated was 4.8 according to results obtained on artificial membranes and mitochondria.

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In an article, published in an article, once mentioned the application of 14187-32-7, Name is Dibenzo-18-crown-6,molecular formula is C20H24O6, is a conventional compound. this article was the specific content is as follows.Computed Properties of C20H24O6

Effect of the Acetonitrile-Water Solvent on the Energy of Complex Formation of the Na+ and K+ Ions with the 18-Crown-6 and Dibenzo-18-Crown-6 Ethers

Stability constants of 1:1 complexes of the 18-crown-6 and dibenzo-18-crown-6 ethers with alkali metal ions (Na+ and K+) in water, acetonitrile, and their mixtures at 278-318 K were determined by potentiometry, conductometry, and UV spectrophotometry. Thermodynamic parameters of the complex formation (DeltaG, DeltaH, and TDeltaS) were calculated. Thermodynamic models (schemes) of the complex formation of the metal ions with the crown ethers were proposed, and contributions of solvation of the metal ions, ligands, and metal complexes into the increasing stability of the complexes on passing from water to acetonitrile were quantitatively estimated.

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Stilbene and Azobenzene Diazonium Compounds as Dye Reagents for Crown Ethers

The change of light absorption of six coloured diazonium compounds (1, 2a, 2b, 3, 4, 5) on complexation with five 18-crown-6 derivatives (6-10) in 1,2-dichloroethane was investigated.In the benzene, stilbene and azobenzene series complexation produces only hypsochromic shifts of the intramolecular ct-band of the diazonium ions up to 140 nm.The extend of the shift is effected by ion pairing.The ct-transition energy of the complexes diazonium ion is independent on the present anion in contrast to the uncomplexed compounds.The colour changes are not caused by host to guest charge transfer or E/Z-isomerisation of the stilbene and azobenzene derivatives.A quantitative explanation of the colour changes is given basing on an electrostatic interaction model.

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Synthetic Route 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

The Effects of Alkali Cation Complexation on the Fluorescence Properties of Crown Ethers

The effects of alkali metal complexation on the fluorescence properties of two crown ethers (a podand and a coronand) were investigated.Metal ion binding leads to changes in fluorescence intensity along with slight shifts in the emission maxima.This is attributed to a rigidization of the fluorophore and an interaction of the metal ion with non-bonding electrons of the crown ethers.The effects on the spectra are more pronounced in fluorescence than in absorption.Fluorescence titration with metal ions provides a simple and sensitive means for the determination of comp lexation constants, which were found to be highly dependent upon the water content of the methanol solution.Halide counterions, in particular iodide, act as dynamic fluorescence quenchers with Stern-Volmer constants that are different for the sodium and potassium complexes, respectively. – (Keywords: Complexation; Crown ether; Fluorescence; Solvent effects)

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Structural and electronic characterization of multi-electron reduced naphthalene (BIAN) cobaloximes

Reported here are the syntheses and characterization of cobaloximes that feature a bis(imino)acenaphthene (BIAN) appended ligand. The X-ray crystal structures and spectroscopy (1H NMR or EPR) of the complexes within the series [Co(aqdBF2)2(MeCN)2] (1), [Co(aqdBF2)(MeCN)2]- (2) and [Co(aqdBF2)2(MeCN)2]2- (3, 3?) are reported and the 3-electron reduced complex [Co(aqdBF2)2(MeCN)2]3- (4) has been prepared in situ and characterized by 1H NMR spectroscopy. The X-ray crystal structures revealed the presence of a 6-coordinate CoII species (1), a 5-coordinate CoI species (2), and a 4-coordinate complex (3, 3?). In the case of complex 3, evidence from single crystal EPR spectroscopy (g|| = 2.017, g? = 1.987; <10 G linewidths) in conjunction with DFT calculations indicate that the EPR signal originates from a delocalized ligand-based unpaired spin. The frontier orbitals obtained from DFT calculations on 1, 2, 3, & 4 support the electronic assignments that were observed spectroscopically. The cathodic cyclic voltammogram (CV) of the solvato congener in DMF solution, namely [Co(aqdBF2)2(DMF)2], exhibits three reversible redox events near -1.0, -1.5 and -2.0 V vs. Fc/Fc+. Catalytic proton reduction was observed by CV near the third redox peak. Compared with other cobaloximes (Ecat = -1.0 V), the delay of catalytic onset arises from the existence of a series of resonance-stabilized intermediates. If you are hungry for even more, make sure to check my other article about 14187-32-7. Reference of 14187-32-7

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14187-32-7, Name is Dibenzo-18-crown-6, molecular formula is C20H24O6, belongs to chiral-catalyst compound, is a common compound. In a patnet, once mentioned the new application about 14187-32-7, Safety of Dibenzo-18-crown-6

3:1: 1 adduct of orthophosphoric acid, dibenzo-18-crown-6, and water: Synthesis and crystal structure

A 3:1: 1 crystalline adduct of orthophosphoric acid, crown ether dibenzo-18-crown-6, and water, 3H3PO4 ¡¤ Db18C6 ¡¤ H2O (I), is synthesized and studied by X-ray diffraction analysis. The orthorhombic structure of compound I (space group Pmn2 1, a = 23.123 A?, b = 12.595 A?, c = 4.922 A?, Z = 2) is solved by a direct method and refined by full-matrix least squares in the anisotropic approximation to R = 0.061 by all 1894 independent reflections. One H3PO4 molecule and Db18C6 and H2O molecules lie on the crystallographic plane m. The H3PO4 molecules are randomly disordered. The H atoms of the H3PO4 and H 2O molecules are not objectively revealed because of high disordering. The Db18C6 and H2O molecules form the host-gust molecular complex [Db18C6 ¡¤ H2O] through hydrogen bonds. All H3PO4 molecules are hydrogenbonded to form infinite layers lying parallel to the xz plane. The [Db18C6 ¡¤ H2O] molecular complexes are arranged between the layers. Pleiades Publishing, Ltd., 2010.

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Application 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.

Charge transfer complexes of crown ethers with neutral organic ?-acceptor, 2-dicyanoethylene 1,3-indane dione

The interaction of benzo-15-crown-5, dibenzo-18-crown-6 and dibenzo-24-crown-8 with 2-dicyanoethylene 1,3-indane dione in CH2Cl2 has been described in terms of the formation of 1:1 molecular complexes.The magnitude of association constants and thermodynamic parameters indicate cooperative interactions of oxygens with the acceptors.The 1H and 13C NMR spectra of the complexes show that ?-? interactions are a major source of ground state stabilization in these complexes.

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Nuclear magnetic resonance and ab initio theoretical studies of 18-crown-6, benzo- and dibenzo-18-crown-6 and their alkali-metal complexes

The formation of alkali-metal ion complexes with the crown ethers, 18-crown-6(18c6), benzo-18c6 and dibenzo-18c6 has been investigated. Theoretical studies of structural changes on complexation, binding energies and changes in electron distribution have been carried out using ab initio quantum theoretical methods. A complementary study of the NMR chemical shifts and coupling constants has also been used to obtain information on complexation and structural changes. The overall views of the structural changes and their relation to ion selectivity as determined by the theoretical and NMR investigations are in agreement. In most cases the structural parameters found bear a close relation to those obtained in crystallographic work on the complexes, where such results are available. An attempt has been made to include solvent effects in aqueous solution by computing the energy of the reaction in which some water molecules in the coordination shell of the metal ion are replaced by the crown ether. When this is done, the ion selectivity sequence predicted from the theoretical work is in conformity with existing (incomplete) experimental data.

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