( •'^17 ) 



Wlioreiis ShlJr, inodifios tlic |iro]i(H-li(in of i>rf/io-jiiini sli<>'iill_v iii 

 tavniir of' llic purii llicrc is pi-csciil Ih'i-(> a luiifli strnnii'cr iiitlut'jice 

 (if AHïi-, in ra\(iiii- of tlic inihu. 



I'arlicularlv iiilprestiiiji here is tln' iiilliK'iicc on llio ainoiint of 

 hciizvl Itfoniiilp. Altliontili willi onlv 0. 002 mol. no niodification of 

 tliose |)i'((|i(ii-|ions is pcrci'iilihli', lliis licconics so proiioiiiiced with 

 doul)l(' llic (|iianlit\ llial |)raclicall\ no more iicn/.vl lironiide i,s 

 fonned. This resnh is xciy slrikin^ and desoi-\cs a cdosei- stndv. 



Wilh foi-ric lH'onii(h_' (hls phenomenon was repeated: this appeared 

 to he a still more po\\(M'fnl catalvzei' than ainniininm hromide, ay 

 the limit of its activity is sitnated still considei'ahly lower as may 

 be seen from the subjoined table: 



T A B 1. E IV. 

 Temp. 50^; 50 eM.' toluene -f- 2.5 cM.' bromine. Dark. 



('omposition of' iho 

 MolFeBrj i Benzyl- mixture, 



on 1 mol Br„ | bromide ort'io | para 



' hromnlnlufne 



Here, liie qnanlity of miho is a,u-ain depressed l)y the calaly/.er. 



\\\\\\ pli(i.iplitiriis trii-lilin-itlr as cataly/.er Dr. van dkh I..\.\n has 

 only made one experiment which, in accordance with Eudm.vnx's 

 iiuestiji-atton, ^aN'e an increase in the amount of b(Mr/.yl bromide. 



T A W 1. H V. 

 Temp. 51'; 50 cM.' toluene -\- 3 ciM.' bromine. Dai'lc. 



Mol P Br, Benzyl- Bromotoluenes 



on '1 mol Br, tirnmide ,, 1 



' orllio para 



1 45.4 41.8 ' .-18.2 



0.02 54.7 , 41.4 | 58. ü 



