OP ARTS AND SCIENCES. 



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prepare as follows : — 5 gr. of tribrommononitrobenzol dissolved in 

 benzol were mixed with an alcoholic solution of the sodic ethylate 

 from 1 gr. of sodium, heated on the water bath just below boiling 

 for some time, and then allowed to stand at a temperature a little 

 above the ordinary for several hours. The red solution thus obtained 

 was filtered from a precipitate which had formed, (this gave a test 

 for bromide with argentic nitrate,) diluted with water, and acidified 

 with dilute sulphuric acid, after which the benzol was separated from 

 the aqueous liquid ; this was extracted with ether, and the combined 

 extracts from the organic solvents purified by crystallization from 

 alcohol until the constant melting point 91° was reached. Sometimes 

 a black tarry product was obtained from the reaction, instead of the 

 white crystals formed if the process had gone well. This tarry mass 

 was worked up most conveniently by distillation with steam, followed 

 "by crystallization of the steam distillate from alcohol. The pure 

 substance was dried at about 70°, and analyzed with the following 

 results : — 



I. 0.1900 gr. of the substance gave by the method of Carius 0.2181 

 gr. of argentic bromide. 

 II. 0.3800 gr. of the substance gave 15.9 c. c. of nitrogen at a tem- 

 perature of 22° and a pressure of 756.5 mm. 



Found. 



II. 



4.72 



The substance is therefore dibromnitrophenetol, and was formed by 

 the replacement of one atom of bromine by the ethoxy radical. 



Properties. — The dibromnitrophenetol crystallizes in bundles of 

 prisms, which are usually somewhat flattened and terminated by a 

 basal plane, also occasionally showing with this two other planes at an 

 obtuse angle to each other. It is white, but turns brown on exposure 

 to the air; melting point 91° ; essentially insoluble in cold water, per- 

 haps very slightly soluble in hot ; alcohol disolves it sparingly when 

 cold, freely when hot ; more soluble in methyl than in ethyl alcohol ; 

 very freely soluble in benzol, chloroform, acetone, or carbonic disul- 

 phide ; freely soluble in ether ; slightly soluble in cold glacial acetic 

 acid, soluble in hot ; very slightly soluble in ligroine. The best solvent 

 for it is hot alcohol. It distils with steam. Strong sulphuric acid 

 has no action in the cold, but when hot gradually forms a black solu- 

 tion ; cold nitric acid has no action on it, but when hot dissolves it, 



