308 THE ACTION OF ORGANO-MAGNESIUM COMPOUNDS 



be obtained easily enough by following either of the methods 

 of procedure described in the separation of the ethyl bromide 

 compound, preferably the hydrochloric acid precipitation 

 method, and the analysis thus procured if materials or time 

 allowed. 



On a partial evaporation of the ethereal solution, a quan- 

 tity of quinhydrone crystallized, which was filtered and 

 recrystallized from ether. It had a practically constant melting 

 point of 170C. 



Analyses gave the following results : 



I. 0.1372 gram of substance gave 0.3330 gram C0 2 

 and 0.0584 gram H 2 O. 



II. 0.1224 gram of substance gave 0.2984 gram C0 2 

 and 0.0531 gram H 2 O 



Calculated for Found. 



C M H W 4 . I II Mean 



. C 66.02$ 66.19$ 66.48$ 66.33$ 



H 4.63$ 4.73$ 4.82$ 4.77$ 



The carbon and hydrogen were both too high. This was 

 expected as the sample had a slight odour of diphenyl. 



The residue remaining after the complete evaporation of 

 the ether was extracted with 75 c.c. of carbon tetrachloride , 

 25 c.c. at a time. The carbon tetrachloride was then distilled 

 off and there remained in the flask a product which did not 

 boil until the temperature nearly reached 250C. The portion 

 distilling from 250-260C. solidified in the condenser tube was 

 collected and crystallized from alcohol. The product con- 

 s'., ied of transparent lustrous plates which had a constant 

 melting point of 70C. An analysis gave the following results, 

 which prove it to be diphenyl. 



0.1210 gram of substance gave 0.4143 gram C0 2 

 and 0.0731 gram H 2 O. 



Calculated for Found. 



* GgHsCeH,;. 



93.45$ 93.38$ 



II 6.55$ 6.71$ 



