Nickel II chloride

The higher iodides, however, tend to be unstable and decomposition occurs to the lower iodide (PI5 -> PI3). Anhydrous chlorides and bromides of some metals may also be prepared by the action of acetyl (ethanoyl) halide on the hydrated ethanoate (acetate) in benzene, for example cobalt(II) and nickel(II) chlorides ... 

Nickel forms yellow anhydrous halides NiXjlX = F. Cl. Br) and a black iodide Nil2 all these halides are made by direct combination of the elements, and the chloride by reaction of sulphur dichloride oxide with the hydrated salt. All dissolve in water to give green solutions from which the hydrates can be crystallised the solutions contain the ion [NifHjOls], and the chloride crystallises as NiCl2.6H2O, nickel(II) chloride hexahydrate. 

Yields were improved to >37% by the addition of sodium sulfite to the reaction mixture. Apart from the sulfite, the C -component unit has the greatest influence on the yield of foHc acid. The use of nickel(II) chloride as an additive has been claimed to give higher yields (25). 

Bis-(triphenylpbospbine)nickel(II) chloride [14264-16-5] M 654.2, m 225 (dec). Wash with glacial AcOH and dry in vac over H2SO4 and KOH until AcOH is removed. [J Chem Soc 719 1958.]... 

Besides the above mentioned method of Tomoda [phthalonitrile, nickel(II) acetate, 1,8-diaza-bicyclo[5.4.0]undec-7-ene, pen tan-1-ol], nickel phthalocyanine (PcNi) is prepared from phthalonitrile and nickel(II) acetate in 2-(dimethylamino)ethanol117 or with nickel(II) chloride in quinoline.1 30-1 59-277-278 The formation of PcNi also takes place without solvent137 or with nickel(II) acetate in ethylene glycol.127... 

Answer (a) Nickel(II) chloride dihydrate (b) aluminum fluoride ... 

In Gegenwart von Tetrakis-[pyridin]-nickel-diperchlorat oder Nickel(II)-chlorid in Athanol mit Tetrabutylammonium-perchlorat als Leitsalz erhalt man unter partieller Hy-drierung und Oligomerisation aus Butadien-(1,3) all-trans-Hexadecatetraen-(1,6,10, J4) in Gegenwart von Bis-[triphenylphosphin]-nickel(II)-chlorid wird Octatrien-(l,3,7) er-halten4. 

Whilst this will be satisfactory when dealing with kinetic data in which reactions involving the solvent will not explicitly appear in the rate equations, it is not appropriate when we consider equilibrium constants. As an exercise, consider the formation of [Ni(en)3] from aqueous solutions of nickel(ii) chloride and en (en = H2NCH2CH2NH2) write the equations with the inclusion and the omission of the water molecules. Can you recognize the driving force for the formation of the chelate in each case ... 

Thiophenes can also be desulfurized to alkenes (RCH2CH=CHCH2R from 115) with a nickel boride catalyst prepared from nickel(II) chloride and NaBILj in methanol.It is possible to reduce just one SR group of a dithioacetal by treatment... 

Determine the correct chemical formulas of potassium permanganate, dinitrogen tetroxide, nickel(II) chloride hexahydrate, sodium hydrogen phosphate, and iron(Itl) oxide. 

Nickel(II) chloride hexahydrate Nickel(II) is, and chloride is Cl". To achieve electrical neutrality, there must be two Cl and one. Hexa indicates six water molecules ... 

What mass of nickel(II) chloride hexahydrate is required to prepare 250. mL of aqueous solution whose concentration is 0.255 M ... 

Begin by finding the chemical formula from the name, nickel(II) chloride hexahydrate. Chloride ion carries -1 charge, and the (II) indicates that nickel is a +2 cation. Electrical neutrality requires two chlorides for every nickel. The name also tells us that the salt contains six water molecules for each unit of nickel(II) chloride. Thus, each formula unit of the salt contains one cation, two Cl anions,... 

C03-0033. Caicuiate the moiarities of the ions present in the soiution of nickel(II) chloride hexahydrate prepared in Exampie. ... 

The most important feature of a dilution is that the number of moles of solute does not change during the dilution. Consider the dilution of an aqueous solution of nickel(II) chloride, as shown in Figure 3-22. The photo shows that the green color, which is due to the ions, fades when the solution is diluted. This fading is visible evidence that the concentration decreases. At the molecular level, there are the same numbers of and Cl ions in the solution before the dilution and after the dilution. However, because the volume of the solution increases, the concentration of the new solution is lower than the concentration of the original solution. 

C19-0062. Draw a sketch that shows a molecular view of the charge transfer processes that take place at a nickel electrode in contact with aqueous nickel(II) chloride, undergoing oxidation ... 

In contrast to 4, 2-acetylpyridine iV-methylthiosemicarbazone, 3a, formed yellow-green, paramagnetic, octahedral [Ni(3a)2A2] complexes with nickel(II) chloride and bromide. The neutral form of the ligand was proposed to be NN eoordinated [180]. Brown, paramagnetic [Ni(3a-H)2] was prepared from nickel(II) acetate with NNS coordination, and its d-d spectrum and ligand field... 

Lutidylphenylketone thiosemicarbazone, 38, and nickel(II) chloride, bromide, or iodide yield [Ni(38-H)2]A2 with NNS coordination based on infrared spectra [187]. All three complexes are electrolytes and the cations are dimeric with sulfur atoms acting as bridges interdimer interactions via sulfur are present. The electronic spectra suggest a nickel(Il) stereochemistry other than tetrahedral or octahedral for these paramagnetic complexes. 

Solution studies of nickel(II) complexes of 2,6-diacetylpyridine bis(thiosemi-carbazone), 28, have been carried out [147]. From a refluxed methanolic solution containing 28 and nickel(II) chloride, [Ni(28)Cl2] was isolated which behaved as a 1 1 electrolyte in methanol [152], Based on spectral information it is proposed that the complex is a distorted octahedron with a SNNNS pentadentate ligand. 

Several strategies closely related to the Peterson synthesis have been developed for diene and polyene generation. Angell, Parsons and coworkers reported a mild method for the diene installation on a carbonyl group using a y-bromoallylsilanc reagent in the presence of excess chromous chloride and a catalytic amount of nickel(II) chloride (equation 102)180. 

The use of transition metals for the facilitation of substitution reactions on vinylic carbon has proven to be quite successful. For example, vinylic chlorides in the presence of nickel(II) chloride react with trialkyl phosphites to substitute phosphorus for the halide (Figure 6.17j.71-72 While reminiscent of a direct Michaelis-Arbuzov reaction, including final dealkylation by a chloride ion, the reaction actually involves an addition-elimination process. It appears that chloride provides a more facile reaction than bromide, a characteristic noted in several reaction systems. 

These products can be reduced by sodium borohydride in combination with nickel(II) chloride to the corresponding 8-hydroxy--y-lactones in 90-95% yield.1... 

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