WHICH NITEOGEN IS SUBSTITUTED EOE HYDEOGEN. 
725 
tance, which separates in small indistinct plates on mixing the alcoholic fluid (after the 
reaction is entirely over) with a large quantity of water. In order to free the precipi- 
tate from a trace of a brown substance, which likewise forms in the reaction, it is filtered 
off from the mother-liquor, dried, and then sublimed through paper, according to the 
method proposed by Gorup-Besanez. The substance is thus obtained in the form of 
perfectly white plates, which dissolve easily in ether and hot alcohol, and which crystal- 
lize from the latter very much like naphtaline. The new compound fuses, at 70° C. to 
an oil, which distils at a higher temperature without decomposition. It possesses a 
peculiar aromatic odour like that of cinnamol and benzol combined. 
0T787 grm. of substance gave 0-607 grm. of carbonic acid and 0TQ7 grm. of water. 
These numbers lead to the formula C 12 H 10 . 
Calculated. 
0^ 144 93-50 
H 10 10 ' 6-50 
154 100-00 
Its chemical composition, combined with the before-mentioned physical properties, 
prove that the hydrocarbon is identical with the diphenyl described by Fittig*. Its 
formation may be described by the following equation: — 
2(0 12 H 6 N 4 , 3SH 2 0 4 ) -1- 4€ 2 H 6 0 = 2G 12 H 10 + 4G 2 H 4 0 + N 8 + 6S1I 2 0 4 . 
V ; 1 v j *■ V i K V J 
Sulphate of tetrazodiphenyl. Alcohol. Diphenyl. Aldehyde. 
Nitrate of tetrazodiphenyl is decomposed in a similar manner by boiling alcohol, but 
simultaneously the formation of a yellow nitro-acid takes place, which stands probably 
to the diphenylic alcohol in the same relation as the nitrophenol to phenylic alcohol 
(compare also the corresponding decomposition of nitrate of diazobenzol, p. 683). 
Action of Sulphuric Acid upon Sulphate of Tetrazodiphenyl. 
On heating sulphate of tetrazodiphenyl dissolved in a small quantity of oil of vitriol, 
a violent evolution of nitrogen gas is observed. The brown liquid which remains after 
the reaction Has ceased contains, besides the excess of sulphuric acid employed, two new 
sulpho-acids, which can be separated by means of their barium-salts. For this purpose 
the brown liquid is diluted with at least thirty times its volume of water, boiled, and 
saturated with carbonate of barium. The precipitated sulphate of barium is then fil- 
tered off, the saline solution evaporated to dryness on the water-bath, and the residue 
several times extracted with hot water. The portion remaining undissolved is the 
* If the diphenyl, prepared according to my method, has not been previously sublimed through paper as 
described, it crystallizes only in the form of small indistinct silvery white plates, which are so different from 
the large naphtaline-like plates described by Fittig, that they appear at first sight to be crystals of quite a dif- 
ferent compound. 
Found. 
92-70 
6-65 
5 d 2 
