14 MR. WATSON SMITH ON ISODINAPI ITHYL - 



F. Lossen found that dinaphthyl could b? obtained from 

 monobromnaphthalin by the action of podium, just as 

 Fittig had obtained diphenyl from monobf ombenzol : 



C H 7 

 2C IO H.Br + 2Na = 2NaBr + p I0 H 



At the same time he (Lossen) found there 1 was a ^o a small 

 quantity of a polymer formed, which he obtained as a cho- 

 colate-brown powder, scarcely at all soluble in alcohol, but 

 more so in ether. It was easily soluble m carbonic di- 

 sulphide. 



II. Dr. Lossen also found that he coulf 1 obtain dinaph- 

 thyl by the oxidizing action, upon naphth« a l m J °* a mixture 

 of manganese peroxide and sulphuric acid : 



2 Clo ^| H -0=^ I °^j + i! z O. 



This mixture he found acted energetically upon naph- 

 thalin, there being liberated, with strong effervescence, 

 much carbonic dioxide. When the actioA was completed, 

 the contents of the retort in which the process was carried 

 on were diluted with water, mangane se sulphate and 

 phthalic acid were dissolved out, and unaltered manganese 

 peroxide and a resinous body left behind. The undissolved 

 portion was boiled with absolute alcohol j an0 - the impure 

 body crystallized out from the filtered solution was re- 

 peatedly recrystallized from alcohol. Th e dinaphthyl was 

 thus obtained in pearly shining scales of a ver y bght yellow 

 colour. Lossen found that it was only possible to obtain 

 the body quite colourless by sublimation. 



Thus obtained, dinaphthyl was found to be much more 

 easily soluble in ether than in alcohol, cry s ^ a l nzm g there- 

 from in moss-like clusters. By slowly coc' nn g a solution of 

 this body in a mixture of ether and alcohol *t was obtained 

 crystallized in well -formed regular octar ie dra. It is very 

 soluble in carbonic disulphide. Benzol dissolves it to 



