424 PROCEEDINGS OP THE AMERICAN ACADEMY. 



Properties of Dichlordlphenoxyquinone, C6Cl2(C6H50)202. — The 

 substance crystallizes from benzol iu beautiful red needles arranged ia 

 rosettes. It melts at 243°, and is very slightly soluble in alcohol even 

 when hot, less so when cold, insoluble in cold and boiling water, diffi- 

 cultly soluble in boiling benzol, and only very slightly soluble in the 

 cold ; it is sparingly soluble in cold chloroform, more easily in hot, 

 slightly soluble in cold glacial acetic acid, but easily when the acid is 

 boiling; in ether, ligroine, carbonic disulphide, or acetone, it is insoluble. 

 The three strong acids have no visible effect on it, hot or cold. It is 

 readily saponified by a solution of sodic hydrate, forming chloranilic 

 acid. It is not affected by sulphurous acid at 100° under the ordinary 

 pressure, but is easily reduced to the corresponding hydroquinone by 

 warming with hydriodic acid, or by the action of glacial acetic acid and 

 zinc dust. 



Dichlordiphenoxyhydroquinone, C6Cl2( C6H50)2(OH)2. 



This substance was prepared by mixing dichlordlphenoxyquinone 

 with hydriodic acid (boiling between 123° and 126°), and heating for 

 some time on the steam bath. The product formed by this reduction 

 was purified by crystallization from boiling dilute alcohol (50 per cent) 

 until it showed the constant melting point of 197°. The analysis of 

 the substance dried at 100° gave the following results : — 



I. 0.2147 gram of the substance gave on combustion 0.4678 gram of 



carbonic dioxide and 0.0723 gram of water. 

 II. 0.1578 gram of the substance gave by the method of Carius 0.1244 

 gram of argentic chloride. 



Found. 

 I. 11. 



59.41 

 3.73 



19.49 



The change from the quinone to the hydroquinone is quantitative. 



Properties of Diclilordiplienoxyhydroquinone. — It crystallizes from 

 dilute alcohol (50 per cent) in large colorless prisms, or in little needles 

 very much branched, forming thick arborescent masses which melt at 

 197°-198°, and are readily soluble in ethyl alcohol, methyl alcohol, 

 or acetone ; soluble in carbonic disulphide or hot glacial acetic acid ; 

 slightly soluble in chloroform, cold glacial acetic acid, or ether. It is 

 insoluble in water, either cold or hot, benzol, or ligroine. Dilute or 

 strong sulphuric acid or hydrochloric acid does not act on the di- 



