The distribution of weight in chemical change is readily expressed in the form of equations by the aid of these symbols; the equation 2HC1+Zn =ZnCl2+H2, for example, is to be read as meaning that from 73 parts of hydrochloric acid and 65 parts of zinc, 136 parts of zinc chloride and 2 parts of hydrogen are produced.
Bernthsen (Ann., 1884, 224, p. 1) condensed diphenylamine with fatty acids, in the presence of zinc chloride.
Fischer); by heating salicylic aldehyde with aniline and zinc chloride to 260° C. (R.
A solution of zinc chloride is easily produced from the metal and hydrochloric acid; it cannot be evaporated to dryness without considerable decomposition of the hydrated salt into oxychloride and hydrochloric acid, but it may be crystallized as ZnC1 2 H 2 O.
At a boiling heat, zinc chloride dissolves in any proportion of water, and highly concentrated solutions, of course, boil at high temperatures; hence they afford a convenient medium for the maintenance of high temperatures.
Pharmacology And Therapeutics Of Zinc Compounds Zinc chloride is a powerful caustic, and is prepared with plaster of Paris in the form of sticks for destroying warts, &c. Its use for this purpose at the present day is, however, very rare, the knife or galvanocautery being preferred in most cases.
It may be prepared by fusion of ortho-toluene sulphonic acid with potash; by the action of phosphorus pentoxide on carvacrol; or by the action of zinc chloride on camphor.
Tafel, Ber., 1886, 19, p. 1924), by distilling the amido-acids with lime, by heating phenols with zinc chloride ammonia (V.
The secondary amines may be of two types-namely,the purely aromatic amines, and the mixed secondary amines, which contain an aromatic residue and an alkyl group. The purely aromatic amines result upon heating the primary amines with their hydrochlorides, and, in some cases, by heating a phenol with a primary amine and anhydrous zinc chloride.
When heated with monobasic saturated acids and zinc chloride it yields acridines.
The olefines may be synthetically prepared by eliminating water from the alcohols of the general formula CnH2n+1 OH, using sulphuric acid or zinc chloride generally as the dehydrating agent, although phosphorus pentoxide, syrupy phosphoric acid and anhydrous oxalic acid may frequently be substituted.
Sand, Ber., 1900, 33, pp. 1 34 0 et seq.), and those with a tertiary carbon atom yield double salts with zinc chloride.
It is a gas at ordinary temperature, and may be liquefied, the liquid boiling at -5° C. It combines with acetyl chloride in the presence of zinc chloride to form a ketone, which on warming breaks down into hydrochloric acid and mesityl oxide (I.
Heated with anhydrous sodium acetate and acetic anhydride it gives cinnamic acid; with ethyl bromide and sodium it forms triphenyl-carbinol (C 6 H 5) 3 C OH; with dimethylaniline and anhydrous zinc chloride it forms leuco-malachite green C6H5CH[C6H4N(CH3)2]2; and with dimethylaniline and concentrated hydrochloric acid it gives dimethylaminobenzhydrol, C 6 H 5 CH(OH)C 6 H 4 N(CH 3) 2.
In Burnett's process a solution of zinc chloride is forced into the pores of the wood.
Anthragallol is synthetically prepared by the condensation of benAoic and gallic acids with sulphuric acid OH i [[Cooh + I 10h - 2h20+ Hooc /Oh]] or from pyrogallol and phthalic anhydride in the presence of sulphuric acid or zinc chloride.
It may be synthetically obtained by distilling oxindole (C 8 H 8 NO) with zinc dust; by heating orthonitrocinnamic acid with potash and iron filings; by the reduction of indigo blue; by the action of sodium ethylate on orthoaminochlorstyrene; by boiling aniline with dichloracetaldehyde; by the dry distillation of ortho-tolyloxamic acid; by heating aniline with dichioracetal; by distilling a mixture of calcium formate and calcium anilidoacetate; and by heating pyruvic acid phenyl hydrazone with anhydrous zinc chloride.
with zinc chloride and glacial acetic acid at 145° C. it yields resacetophenone (HO) 2 C 6 H 3 Coch 3 (M.
The most modern and the most generally accepted method is volumetric, and is based on the reaction between zinc chloride and potassium ferrocyanide, by which insoluble zinc ferrocyanide and soluble potassium chloride are formed; the presence of the slightest excess of potassium ferrocyanide is shown by a brownish tint being imparted by the solution to a drop of uranium nitrate.
The ore is given only a partial chloridizing roast, on account of the great loss in silver that would be caused by the formation of zinc chloride.
Closely related to flavoline is flavaniline or (a)-para-aminophenyl-y-methylquinoline, which is formed when acctanilide and anhydrous zinc chloride are heated together for many hours at 250-270° C. (0.
Fischer and C. Rudolph, Ber., 1882, 15, p. 1500), or by heating orthoand para-aminoacetophenone with zinc chloride to 90° C. (0.
Molten anhydrous zinc chloride gives zinc (+) and chlorine (- ), equations 1 and 2.
Fischer); by heating salicylic aldehyde with aniline and zinc chloride to 260Ã‚° C. (R.
A concentrated solution of zinc chloride converts starch, cellulose and a great many other organic bodies into soluble compounds; hence the application of the fused salt as a caustic in surgery and the impossibility of filtering a strong ZnC1 2 solution through paper (see Cellulose).
Calm, Bert, 1882, 15, p. 616); by heating a-naphthol with calcium chloride-ammonia to 270Ã‚° C.; and by heating pyromucic acid, aniline, zinc chloride and lime to 300Ã‚° C. (F.
It is a gas at ordinary temperature, and may be liquefied, the liquid boiling at -5Ã‚° C. It combines with acetyl chloride in the presence of zinc chloride to form a ketone, which on warming breaks down into hydrochloric acid and mesityl oxide (I.
It forms hydroxyhydrocollidine when heated with acetamide and anhydrous zinc chloride (F.
with zinc chloride and glacial acetic acid at 145Ã‚° C. it yields resacetophenone (HO) 2 C 6 H 3 Coch 3 (M.
Closely related to flavoline is flavaniline or (a)-para-aminophenyl-y-methylquinoline, which is formed when acctanilide and anhydrous zinc chloride are heated together for many hours at 250-270Ã‚° C. (0.
Fischer and C. Rudolph, Ber., 1882, 15, p. 1500), or by heating orthoand para-aminoacetophenone with zinc chloride to 90Ã‚° C. (0.
Molten anhydrous zinc chloride gives zinc (+) and chlorine (-), equations 1 and 2.
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