JACKSON AND GRINDLEY. — ACETAL3 PROM QUINONES. 429 



color vvheu washed with alcohol and ether, aud theu dried for a short 

 time over sulphuric acid aud paraffiue. It was then analyzed with 

 the following results : — 



I. 0.2410 gram of the substance gave on combustiou 0.3459 gram 

 of carbonic dioxide and 0.1064 gram of water. 

 II. 0.2005 gram of the substance gave on combustiou 2943 gram 

 of carbonic dioxide and 0.9720 gram of water. 



III. 0.1920 gram of the substance gave by the method of Carius 



0.1851 gram of argentic chloride. 



IV. 0.2372 gram of the substance gave by the method of Carius 



0.2233 gram of argentic chloride. 



Found. 



IV. 



23.28 



These results indicate that the substance is a dimethoxydichlor- 

 quinone, to which two molecules of methyl alcohol have been added. 

 To confirm this view of its composition the sodium salt was prepared 

 and analyzed as follows. An excess of the insoluble compound was 

 added to a solution of sodic methylate in a large ([uautity of methyl 

 alcohol. As the sodium salt formed is soluble in methyl alcohol,* 

 while the original compound is not, it was easy by filtering to obtain a 

 pure solution of the salt, from which it was then precipitated by 

 adding an excess of ether. The precipitate was repeatedly washed 

 with ether by decantation, transferred to a weighed platinum crucible, 

 dried over sulphuric acid and paraffine, and analyzed with the follow- 

 ino; results : — 



'» 



I. 0.2372 gram of the salt gave 0.0828 gram of sodic sulphate. 

 II. 0.2887 gram of the salt gave 1025 gram of sodic sulphate. 



Calculated for Found. 



CeCl2(0CH3)30„(Cn30Na)2(CH30H)j. I. II. 



Sodium 11.24 11.31 11.50 



As these analyses indicate that the salt contains two molecules of 

 methyl alcohol of crystallization, an attempt was next made to detei'- 

 mine the amount of volatile matter which it contained, with the 

 following result : — 



* In the preparation of the original substance the sodium salt was obtained 

 as a precipitate, because the amount of methyl alcohol used was not enough to 

 dissolve it. 



