306 THE ACTION OF ORGANO-MAGNESIUM COMPOUNDS 



The compound was extremely hygroscopic. An analysis of 

 the same sample as analysed above, but before the continued 

 drying at high temperature, gave the following results: 



0.1298 gram of substance gave 0.2876 gram C0 2 and 

 0.0619 gram H 2 O. 



C 60.42$ 



H 5.29$ 



The total yield was about 10 per cent of the quinone used. 

 The colour of a concentrated alcoholic solution of this sub- 

 stance is dark brown; one cubic centimeter of this concen- 

 trated solution added to 200 c. c. of water is pink ; and the addi- 

 tion of a drop of any alkali gives a grass green, while a drop 

 of acid will restore the pink again. This substance reduces an 

 alkaline solution of potassium permanganate, and is apparently 

 oxidized by adding bromine water to an alcoholic solution of 

 it. By either of these treatments an amorphous product with 

 a light yellow colour was obtained. 



A method of precipitation of this same substance was 

 developed. About 0.4 gram of the same sample as analysed 

 above, was dissolved in a few cubic centimeters of sodium 

 hydroxide and diluted with water to one liter. The green 

 solution was heated to boiling, acidified with strong hydro- 

 chloric acid and then the brown precipitate thus formed 

 allowed to settle. A tall cylindrical jar was used, as it offered 

 a smaller bottom surface and a greater column of water, thus 

 making it possible, when the precipitate had settled, to syphon 

 the solution off, leaving but little with the precipitate. The 

 precipitate was heated again with another liter of dilute 

 hydrochloric acid, 10 volumes of water to 1 volume of acid, 

 Sp. G. 1.2, and allowed to settle. The decantation was 

 repeated three times with the same quantity of dilute acid each 

 time. The fourth dilution was filtered while hot through a 

 hot-water funnel and washed thoroughly with hydrochloric- 

 acid of the same dilution as above , the last washing being with 



