Zinc ethanoate

The reaction of zinc ethanoate with 1,4,8,11-tetrathiaundecane gives the trimetallic complex (116) which transmetallates on treatment with [Ni(H20)6]2+. 

Zinc ethanoate behaves similarly to mercury(II) ethanoate on reaction with 2-(2-pyridyl)benzothiazole and gives complexes of a ring-opened ligand.928... 

Acetic acid, zinc salt dicarbomethoxy zinc zinc (II) acetate zinc diacetate zinc ethanoate. 

It is prepared commercially by treating benzene diazonium chloride with sodium sulphite and then reducing the mixture with zinc dust and ethanoic acid. It can also be prepared by reduction of benzene diazonium chloride with SnCl. ... 

Treatment with PCI5 gives phthalyl chloride reduction with zinc and ethanoic acid or NaOH gives phthalide. Fusion with urea gives phthalimide. 

The larger cations of Group 1 (K, Rb, Cs) can be precipitated from aqueous solution as white solids by addition of the reagent sodium tetraphenylborate, NaB(C( H5)4. Sodium can be precipitated as the yellow sodium zinc uranium oxide ethanoate (sodium zinc uranyl acetate). NaZn(U02)3(CH3C00)y. 9H2O. by adding a clear solution of zinc uranyl acetate in dilute ethanoic acid to a solution of a sodium salt. 

The precipitate is soluble in free mineral acids (even as little as is liberated by reaction in neutral solution), in solutions containing more than 50 per cent of ethanol by volume, in hot water (0.6 mg per 100 mL), and in concentrated ammoniacal solutions of cobalt salts, but is insoluble in dilute ammonia solution, in solutions of ammonium salts, and in dilute acetic (ethanoic) acid-sodium acetate solutions. Large amounts of aqueous ammonia and of cobalt, zinc, or copper retard the precipitation extra reagent must be added, for these elements consume dimethylglyoxime to form various soluble compounds. Better results are obtained in the presence of cobalt, manganese, or zinc by adding sodium or ammonium acetate to precipitate the complex iron(III), aluminium, and chromium(III) must, however, be absent. 

Quinaldinic acid. Zinc > 100 mg in a solution acidified with acetic ( ethanoic) acid to pH 3-4. Heat to boiling and add 3 per cent sodium quinaldate solution with stirring until precipitation is complete (25 per cent excess should be used). Cool to room temperature, filter and wash the precipitate with cold water and then a little ethanol. Dry at 105-110 °C and weigh as Zn(C10H6O2N)2,H2O (Section 11.50). 

Determination of chlorate as silver chloride Discussion. The chlorate is reduced to chloride, and the latter is determined as silver chloride, AgCl. The reduction may be performed with iron(II) sulphate solution, sulphur dioxide, or by zinc powder and acetic (ethanoic) acid. Alkali chlorates may be quantitatively converted into chlorides by three evaporations with concentrated hydrochloric acid, or by evaporation with three times the weight of ammonium chloride. 

Claims were refuted [9] that in Reformatsky reactions with ethyl bromo-ethanoate and acetophenone (or benzophenone), magnesium gave results inferior to those obtained with zinc [10]. 

With Iodine. As is the case with magnesium (see Sect. 5.3.1) iodine has been applied [58] in a Barbier-type reaction with propargyl bromide and cyclohexanone. More recently, in a Reformatsky reaction under sonication [59], use was made of iodine-activated zinc. In the absence of iodine the sonicated mixture of zinc, ethyl 2-bromo-ethanoate and acetophenone reacted slowly and gave no addition product recovery of the ester and the ketone were quantitative. 

Although in some cases the ozonide can be isolated, these compounds are generally fragile and decompose explosively. Usually, the ozonides are reductively decomposed immediately after formation with zinc (Zn) in acetic add (ethanoic acid, CH3CO2H) or dimethyl sulfide [( 113)28] to give two equivalents of aldehyde, two equivalents of ketone, or one equivalent of each (depending upon the structure of the alkene). The overall process of ozonization coupled with reductive hydrolysis is known as ozonolysis. 

More generally, reduction of cyclic anhydrides such as phthalic anhydride (benzene-1,2-dicarboxylic acid anhydride) with zinc (Zn) in ethanoic acid (acetic acid, CH3CO2H) results in the formation of cyclic esters (lactones) (Scheme 9.114). As shown, the zinc (Zn) metal is oxidized (to zinc oxide [Zn02]), while the... 

Scheme 9.114. A representation of the reduction of phthalic anhydride (benzene-1,2-dicarboxylic acid anhydride) to the corresponding lactone with zinc (Zn) in ethanoic acid (acetic acid).

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