ON QUINONE. WALLACE. 307 



pure -water. When dried as much as possible with a suction- 

 pump, it was heated while still on the filter-paper in a hot-air 

 closet for three hours at 125C. As the precipitate adheres so 

 closely to the filter paper, a suction pump and a platinum cone 

 are practically indispensable in carrying out the above filtra- 

 tion. The brown mass was then removed from the filter 

 paper, dissolved in ethyl alcohol and filtered. On evaporation 

 of the alcohol, the remaining residue was the same as obtained 

 by the other method. An analysis gave the following 

 results : 



(The same analyses of the substance as given above, are 

 also given here for comparison.) 



0.1492 gram of substance gave 0.3605 gram C0 2 

 and 0.0598 gram of H 2 O. 



c 



H 



Quinone and Phenylmagnesium Bromide. 



An ethereal solution of 6 grams of quinone was added 

 gradually to a solution of phenylmagnesium bromide obtained 

 by dissolving 3.5 grams of magnesium ribbon in 25 grams of 

 brornbenzene and 40 grams of absolute ether. On standing 

 for a day, 75 grams of water and dilute hydrochloric acid, 

 enough to acidify the mixture, were added. The brown pre- 

 cipitate produced was filtered off and the ethereal solution 

 separated as in the former compounds. The precipitate was 

 washed with hot water, then ether, and left to dry. The 

 residue left from dissolving in and evaporating from ethyl 

 alcohol was small. Its properties were similar to the com- 

 pounds obtained from methyl iodide and ethyl bromide. The 

 product obtained from phenyl bromide and methyl iodide has 

 not yet been analysed. The pure substance, however, could 



