720 
ME. P. GrEIESS ON A NEW SEEIES OE BODIES IN 
of phenylic acid. I propose, therefore, to designate Fittig’s hydrocarbon, G 12 H 10 , as 
diphenyl, and to call benzidine diamidodiphenyl. 
Nitrate of Tetrazodiphenyl, € 24 H 6 N 4 , 2NH0 3 . 
This compound is most readily and copiously obtained by passing nitrous acid through 
a cold concentrated aqueous solution of nitrate of diamidobenzidol, when only traces of 
a brown amorphous body are formed, whilst from an alcoholic solution the latter is 
deposited in considerable quantities. When a sufficient current of gas has been passed 
through the solution, the brown body is separated by filtration, the filtrate mixed with 
twice its volume of strong alcohol, and ether added as long as any white crystals are depo- 
sited. By once more dissolving the crystals in a very small quantity of water, and 
reprecipitating with alcohol and ether, they are obtained perfectly pure : it will be readily 
perceived that this mode of preparation closely resembles that for the preparation of 
nitrate of diazobenzol, which body presents a striking analogy to the nitrate of tetrazo- 
diphenyl. The latter crystallizes in white or slightly yellowish-tinged needles, which 
are readily soluble in water, more difficultly so in alcohol, and insoluble in ether. On 
heating they explode with the same violence as the analogous diazo-compound. 
Sulphate of Tetrazodiphenyl, C 12 H 6 N 4 , 3 SH 2 0 4 . 
After mixing a concentrated aqueous solution of the nitrate of tetrazodiphenyl with a 
sufficient quantity of cold sulphuric acid, diluted previously with its own bulk of water, 
this new body separates, on the addition of strong alcohol, either in the form of a white 
crystalline powder, or in white needles. If alcohol does not completely precipitate it, 
ether must be added to complete its separation. It is very soluble in water. On heating 
in a dry state an explosion ensues. 
I. 0'820 grm. of substance gave, on direct precipitation with chloride of barium, 
0-811 grm. of sulphate of barium. 
II. 0-441 grm. gave 0-4355 grm. of sulphate of barium. 
Calculated. 
Found. 
2G 12 H 6 N 4 412' 
’ i 
58-36 
' i. ii.' 
3SH 2 0 4 294 
41-64 
41-60 41-54 
706 
100-00 
This compound partakes of the nature of an 
acid salt. 
Platinum-salt of the Hydrochlorate of Tetrazodiphenyl , € 12 H 6 N 4 , 2HC1, 2Pt Cl 2 . 
This salt is precipitated from a moderately dilute solution of the nitrate or sulphate 
by means of bichloride of platinum. It forms light-yellow very small narrow plates. 
By employing a very dilute solution^ it falls slowly, in small, elongated, well-formed 
