714 
MR. P. GRIESS ON A NEW SERIES OE BODIES IN 
It may, I think, be safely deduced from these facts that two distinctly different series of 
compounds are obtained by the substitution of two atoms of hydrogen in benzol by two 
different elements, or groups of atoms, according as this substitution is accomplished, 
and that these two series differ most distinctly in their physical properties, although their 
chemical composition is the same. The great differences between the fusing-points 
form one of the most important means of distinction between the members of the two 
series. The fusing-points of series a lie considerably higher than those of the (3 series ; 
sometimes a difference of 70° C. is observable, as will be seen by the accompanying Table. 
a. Series. 
/ 3 Series. 
Bromonitrobenzol . . 
. 126° C. 
56° C. 
Chloronitrobenzol . . 
. 83° C. 
46° C. 
Nitraniline 
. 141° C. 
108° C.- 
Bromaniline .... 
. 57° C. 
Liquid at the ordinary temperature. 
Chloraniline .... 
Liquid at the ordinary temperature. 
Diazo-amidonitrobenzol 
. 245° C. 
195° C. 
Diazonitrobenzolimide . 
. 71° C. 
53° C. 
The compounds to which the experiments just described gave rise belonged exclu- 
sively to the aniline group. Now there could be little doubt that the homologues of 
aniline, and the similarly constituted bases, migh the also converted into diazo-com- 
pounds. This I have confirmed by experiment, the more readily since it was to be 
foreseen that the decomposition of some of these compounds would give rise to the 
formation of certain bodies which could not have been obtained by the ordinary 
methods, e. g. naphtylic alcohol, the existence of which, however, could not be doubted 
for a moment. 
DIAZOTOLUOL COMPOUNDS. 
These compounds exhibit considerable analogy with regard to preparation, solubility, 
and many other properties to the corresponding aniline derivatives. They seem, how- 
ever, to be somewhat more constant, and to crystallize more readily. 
Nitrate of Diazotoluol, € 7 H 6 N 2 , NH0 3 . 
This substance is best prepared by the action of nitrous acid upon an aqueous solution 
of nitrate of toluidine, but it can also be obtained from diazo-amidotoluol. It forms 
long white needles, which are decomposed on boiling with water, according to the follow- 
ing equation : — 
€ 7 H 6 N 2 , NH03+H 2 0=€ 7 H 8 O+NHOg +N 2 . 
Nitrate of diazotoluol. Cresyl- 
alcohol. 
The other compounds are readily obtained from the nitrate in the ordinary manner. 
