JACKSON AND GRINDLEY. — ACETALS FROM QUINONES. 445 



Saponijication of Dichlordimethoxyqumone Dihenzoyldimethylacetal. 



The substance was boiled with sulphuric acid of specific gravity 

 1.44, in the manner already described under the corresponding ethyl 

 compound, and the phenomena observed in this case were exactly 

 similar to those presented by the ethyl compound. The product of 

 the reaction was purified by recrystallization from a mixture of 

 chloroform and alcohol until it showed the constant melting point 

 205°-206°, when it was dried at 100°, and analyzed with the following; 

 result : — 



0.2071 gram of the substance gave according to the method of 

 Carius 0.1288 gram of argentic chloride. 



Calculated for 

 CfiCl2(OCH3),(O0OC6H5)2O. Found. 



Chlorine 15.33 15.38 



f- 



This product therefore corresponds to that obtained by the saponi- 

 fication of the ethyl compound, and this view of its nature is confirmed 

 by the striking similarity between these two substances in crystalline 

 foi"m. 



Properties of the Oxide of Dichlordimethoxyhydroquinone Diheii- 

 zoate. — It crystallizes from a mixture of alcohol and chloroform in 

 white well formed rhombic prisms, shorter than they are broad, 

 terminated by a very obtuse octahedron and a basal plane forming a 

 very blunt end ; the j^risms are frequently rendered six-sided by the 

 presence of two basal planes on the acute edges. It melts at 205°- 

 206°, and is readily soluble in chloroform ; soluble in glacial acetic 

 acid, or benzol ; slightly soluble in alcohol, acetone, or carbonic disul- 

 phide ; very sparingly soluble in ether ; insoluble in water. The best 

 solvent for it is a mixture of alcohol and chloroform. 



Dichlordiethoxyquinone Di ethyl acetaldicarhonic Ester, 



C6Cl2(OC2H5),,(OC2H5)2(OCOOC,H,)2. . 



After we had succeeded in replacing the sodium in the salts of the 

 hemiacetals described in this paper with the benzoyl radical, it seemed of 

 interest to see whether other acid chlorides would act in the same way, 

 and we therefore tried the action of chlorocarbonic ester. Four sframs 

 of the sodium salt of dichlordiethoxyquinone diethylhemiacetal sus- 

 pended in absolute alcohol were mixed with a slight excess of chlorocar- 

 bonic ester, and warmed on the steam bath for a few minutes in order 

 to complete the reaction. The solution was filtered while still hot from 



