Category: 14098-44-3

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The Reaction of Polycyclic Alkoxysilylamides of Li, Na, and K with Organic Lewis Bases

Independently of the ligand at the nitrogen atom (tert-butyl or trimethylsilyl) the polycyclic and dimeric lithium (alkoxysilyl)-tert-butylamide 1 or lithium (alkoxysilyl)silylamide 2 react with bases like pyridine, tetrahydrofuran, or dioxane to form the acid-base adducts 1a, 1b, 1c, and 2a of similar structure.An X-ray structure analysis of 1b confirms the base tetrahydrofuran being coordinated by the oxygen to one of the lithium atoms while the other is surrounded by oxygen and nitrogen atoms of the siloxyamide ligand.The two metal atoms have different coordination numbers (3 versus 4), the shorter distances are found at the one with less neighbours.Even an excess of the base does not lead to complexes in which the two metal atoms within the molecule have equal degree of saturation or have an equal environment.Nevertheless this situation can be reached with the corresponding sodium compound 3, which forms 3a by contact with pyridine.In this product the two sodium atoms have an identical coordination sphere being bound to three nitrogen and one oxygen atom.A compound with different sodium atoms is formed when 3 is treated with alpha,alpha’-bipyridine.This astonishing unsymmetry in the coordination of the two metal atoms is not realized in the corresponding potassium compound 4a, formed from 4 and alpha,alpha’-bipyridine (equally coordinated potassium atoms).The existence of acid-base adducts of 3 and 4 with phenanthroline and different crown ethers has been proven. – Key Words: Lewis acid-base adducts / Alkali metal amides / Chelated metals

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Analysis of reactions between crown ethers and alkali or alkaline earth metal cations in aqueous solutions by capillary zone electrophoresis

Complex formation constants of six crown ethers, benzo- 12-crown-4, benzo- 15-crown-5, benzo-18-crown-6, dibenzo-18-crown-6, dibenzo-21-crown-7, and dibenzo-24-crown-8 (B12C4, B15C5, B18C6, DB18C6, DB21C7, and DB24C8, respectively) with alkali and alkaline earth metal cations have been measured in aqueous solutions by capillary zone electrophoresis. The procedure involved the measurement of change in the electrophoretic mobility of the ligands upon increasing the metal ion concentration in the carrier electrolyte solution. A substantial increase in apparent electrophoretic mobility was observed for the crown ethers with increasing concentrations of the metal ions. The variations in increased electrophoretic mobility were attributed to the different stability of the complexes formed between the cations and the crown ether. The complex formation constants obtained with alkali metal cations were in the orders of: K+ > Na+ > Rb+ > Cs+ (B18C6), K+ > Na+ > Rb+ > Cs+ (DB18C6), Rb+ > Cs+ > K+ (DB21C7), and Rb+ > Cs+ (DB24C8); while with alkaline earth metal cations it was: Ba2+ > Sr2+ > Ca2+ (B18C6) and Ba2+ > Sr2+ (DB18C6). All the ligands examined showed no change in their apparent electrophoretic mobility upon changing Li+ and Mg2+ concentrations, indicating less reactivity with the cations. From the results obtained in this study, the electrophoretic method was proved to be preferable for analyzing the reactivity of the crown ethers and the selectivity toward metal cations.

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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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Dendritic effects of crown ether-functionalized dendrimers on the solvent extraction of metal ions

The ability of a series of crown ether-functionalized dendrimers to function as alkali metal picrate extraction agents is assessed by liquid-liquid extraction and 1H NMR titration experiments. Crown ether-functionalized dendrimers that contain Frechet-type poly(benzyl ether) dendrons of different generation as building blocks display different extraction characteristics toward alkali metal cations. Positive and negative dendritic effects depending on the generation of the dendrimer are assigned in the complexation behaviour of the dendritic host compounds.

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Na+ Complexation of New Multidentate Polyether Ligands – Rapid Estimation of Complexation Constants by 23Na NMR Spectroscopy

A new 23Na NMR method for fast and simple estimation of Na+ complex stabilities is reported and applied to various polyether ligands.Synthesis of the new coronands and podands amongst the employed substrates are given.

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Nitration of benzo crown ethers with potassium nitrate in polyphosphoric acid

A general method for the nitration of benzo crown ethers with potassium nitrate in polyphosphoric acid has been developed. Mono- and dinitro derivatives of benzo-12-crown-4, benzo-15-crown-5, dibenzo-18-crown-6, and dibenzo-24-crown-8 have been prepared. The role of complex formation in the regioselective tendency for the nitration of dibenzo-18-crown-6 has been demonstrated.

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Transition-metal Complexes of Crown Ether Benzodithiolenes

Three new dithiolene ligands have been synthesized, two of which have the novel feature of a crown ether ring attached directly to the benzene ring of an aryl dithiolene.Complexes with transition metals have been prepared and their (1)H, (13)C NMR, UV/VIS and electrochemical properties recorded.The information obtained appears to reflect variations in the degree of delocalisation in the metallodithiolene ring within the series of complex types.

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Establishment of an efficient synthetic route to 3,4:3?,4?-bis(3,6,9-trioxaundecane-1,11-dioxy)benzil

3,4:3?,4?-Bis(3,6,9-trioxaundecane-1,11-dioxy)benzil (1) [bis(crown ether)benzil] was prepared by three different routes in which the third route C, including the method of Sonogashira-coupling, was the most efficient method with the overall yield of 50%. Further, the method of synthesizing the novel compound 3,4:3?,4?-bis[3,4-(3,6,9-trioxaundecane-1,11-dioxy)]benzoin (6) [bis(crown ether)benzoin], which has not yet been prepared appropriately, was also provided.

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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. 14098-44-3, Name is Benzo-15-crown-5, molecular formula is C14H20O5. In a Article£¬once mentioned of 14098-44-3, SDS of cas: 14098-44-3

Synthesis and structural characterization of a new supermolecular compound: H3PW12O40¡¤6C14H20O5¡¤16H2O (C14H20O5 = benzo-15-crown-5)

The new supermolecular compound, H3PW12O40¡¤6C40H20O5¡¤16H2O (C14H20O5 = benzo-15-Crown-5), was synthesized in methanol solution and structurally characterized by elemental analysis, IR, 1H NMR and single crystal X-Ray diffraction. It was shown that PW12O40/3- anions possess alpha-Keggin structure with crystallographic disorder. The disorder averages the W-W distances and W-O(b/c)-W angles, but the vibrational ellipsoids of oxygen atoms are not elongated obviously. In the compound, water blocks are formed, which are hydrogen-Bonded to crown ether molecules. Since crown ether molecules fetter the movement of water molecules and oxonium ions, the conductivity is lower (rho(r.t.) < 10-7 S cm-1). The compound crystallizes in the triclinic space group PI? with a = 14.154(3), b = 15.598(3), c = 18.023(3) A?, alpha = 67.17(3), beta = 89.83(3), gamma = 83.27(3), V = 3638.1(13) A?3, Z = 1 and R1(wR2) =0.0655(0.1701). (C) 2000 Elsevier Science B.V. Sometimes chemists are able to propose two or more mechanisms that are consistent with the available data.SDS of cas: 14098-44-3, If a proposed mechanism predicts the wrong experimental rate law, however, the mechanism must be incorrect.Welcome to check out more blogs about 14098-44-3, in my other articles.

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Syntheses and spectroscopic characterization of double-armed benzo-15-crown-5 derivatives and their sodium and potassium complexes

A series of new benzo-15-crown-5 derivatives (1-6) containing formyl and imine groups were prepared. New formyl crown ethers (1 and 2) were prepared by reaction of 4?,5?-bis(bromomethyl)benzo-15-crown-5 with 2-hydroxy-3-methoxybenzaldehyde (o-vanillin) and 2-hydroxy-5-methoxybenzaldehyde in the presence of NaOH. New Schiff bases (3-6) were synthesized by the condensation of corresponding aldehydes with 1,3-diaminopropane and 1,4-diaminobutane. Sodium and potassium complexes (1a-6a and 1b-6b) of the crown compounds forming crystalline complexes of 1:1 (Na+:ligand) and 1:2 (K+:ligand) stoichiometries were also synthesized. The structures of the aldehydes 1 and 2, imines 3-6 and complexes (1a-3a and 1b-3b) were confirmed on the basis of elemental analyses, IR, 1H- and 13C-NMR, and mass spectroscopy.

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