1076 
TAB LE: VIE 
AIClz; = 0.2; sulphonchloride = 0.1 n. 
| | 
t (aa) Ke 
0 | 60.8 End 
| | The AICI; 
| so | on | aso 
| ma | onm ARE 
240 | 3.4 | 0.0120 extent. 
When compared with table I, the reaction constant has become 
10 times greater; also it is constant till the end. The lesser value 
at the commencement will, probably, have been caused by the fact 
that the benzene was not yet saturated with the catalyst which is 
but slightly soluble therein. 
Hence, it must be observed that the relation given above only 
applies to partly paralysed AICI,; the free aluminiumchloride has 
a much more powerful action. 
We can now go a step further. The above reaction may be ima- 
gined to take place in two phases: 
i aaa | 
I BrC,H,80,C1. AIC], + C,H, = BrC,H,SO,CIAICI,C,H, 
Il BrC,H,S0,CLAICI,C,H, = BrC,H,SO,C,H,AICI, + HCI 
The first (1) represents the real catalytic reaction which shows us 
the formation of a ternary compound, called by one of us the 
dislocation. 
[This dislocation applies here to the benzene because that of the 
other molecule in the formation of BrC,H,SO,Cl. AICI, has already 
taken place before the starting of the reaction. The arrows indicate 
that the benzene is rendered active by all the AICI,]. 
The second (II) is the elimination of the hydrogen chloride. 
If now we supposed that I would proceed with infinite velocity 
in regard to Il we should measure the reaction of decomposition of 
the ternary compound and the constant thereof could not be depen- 
dent on the concentration of the aluminium chloride. Only by assu- 
ming that I proceeds slowly in regard to II we obtain the course 
of the reaction as found by us’). 
1) Not the existence of a similar ternary compound is, therefore, essential because the 
course of the reaction shows that it breaks up, but the act of its formation called by one 
of us dislocation. (Also compare Dissertation H. J. Prins Delft 1912 p. 12 and 54). 
