TRANSFORMATION OF NITROAMINES AND ALLIED SUBSTANCES. 141 
appearance of chloroamine in these solutions led him to the conclusion 
that hydrogen chloride was produced, but he does not determine the 
amount of hydrogen chloride, and thus misses this fact. Without attempt- 
ing to examine his views as to the series of changes (reversible) by which 
he supposes hydrogen chloride to be produced, it may be stated that he does 
not suggest the reduction of chloroamine or hypochlorous acid. Moreover, 
it may be pointed out that the pink or purple colour referred to above, 
which appears during the decomposition of the chloroamine, is without 
doubt identical with the ordinary colour reaction of bleaching powder 
and aniline, and not as is suggested due to a compound, Ar. Nz. Ac, 
produced together with hydrogen chloride in a reversible reaction with the 
acid :—Ar. NCI. Ac-++ Hz = Ar. Nz. Ac+ HCI. 
Summary. 
1. The decomposition of acetylchloroaminobenzene in pure aqueous 
solution, or in the presence of all acids including hydrochloric, ata very low 
concentration is mainly hydrolysis and reduction of the hypochlorous 
acid : 
Ar. NCl. Ac+ H,O >Ar.NH.Ac-+ HClO 
Ar.NH.Ac+ H,O-Ar.NH,-+ CH,.CO,H. 
x(HClO) + Ar. NH,—(Ar. NH, + 20) + «HCl. 
The transformation of the chloroamine into chloroanilides, which 
follows from the formation of hydrogen chloride, is quite subsidiary. 
2. With higher concentrations of hydrogen chloride, more chlorine 
appears in the system from the reaction H’+ Cl’ + HClO =Cl,-+ H,0. 
According to Jakowkin’s measurements, chlorine is nearly completely 
hydroiysed in water at concentrations below 0-05 in the absence of excess 
of hydrogen chloride, whilst on the other hand in solutions of hydrogen 
chloride above 0-1 N, hydrolysis of the chlorine is nearly absent. Hence, 
now that chlorine and anilide are both at relatively high concentrations, 
the transformation of chloroamine to chloroanilide is the main reaction. 
3. With acids other than hydrogen chloride, increase in the concentra- 
tion cannot cause a similar change in the reaction. 
4. The results of the study of the decomposition of chloroamine in 
aqueous solution are in complete harmony with the earlier view as to the 
part played by hydrogen chloride in the conversion of chloroamines to the 
isomeric chloroanilides. 
The Committee asks to be reappointed with a grant of 201. 
The Report is a summary of the work which has been carried out. A 
detailed account of the experimental work will be published later in one 
of the chemical journals. 
Dynamic Isomerism.—Report of the Committee, consisting of 
Professor H. EK. Armstrone (Chairman), Dr. T. M. Lowry 
(Secretary), Professor SypNEY Youna, Dr. C. H. Desscu, 
Dr. J. J. Dopste, and Dr. M. O. Forster. (Drawn up by 
*he Secretary.) 
A. Rotatory Dispersion. 
Tue past year has witnessed the culmination of an investigation that 
has a close relationship to the main line of research for which the 
