( 680 ) 



Quantity of 

 by-product in % 



Quantity of b)--prod. in 

 100 partsof main prod. 



compounds. One would feel inclined to attribute this to "steric 

 disturbances" introduced into Organic Chemistry by V. Meijer, were 

 it not that the specific volume of chlorine and of bromine in the 

 dichloro- and bibromolienzenes dilfers but little. 



Perhaps it is rather the atomic weight of chlorine and bromine 

 which has some connection with the above. For further particulars 

 concerning this research the "Recueil" should be consulted. 



Amsterdam, Org. cliem. Lab. of the University, January 1906. 



Chemistry. — "The intvoduction of halogen atoms into the benzene 

 core in the reduction of aromatic nitro-comjwiuids" . By 

 Dr. J. J. Blanksma. (Communicated by Prof. A. F. Holleman). 



(Communicated in the meeting of January 27, 1006). 



Some lime ago I cited and communicated some experiments ') 

 which showed that, in some cases, in the reduction of aromatic 

 nitrocompounds, halogen atoms may be removed from the benzene 

 core. In 1901 an article by Pinnow ") appeared in which a 

 fairly large number of cases are mentioned, where halogen atoms 

 are introduced into tlie benzene core in the reduction of aromatic 

 nitrocompounds. Pinnow endeavours to find the conditions under 

 which this secondary reaction is as much as possible prevented in 

 order to prex'ent formation of halogenised amidocompounds as by- 

 products, alongside the amidocompounds. 



1) Proc. 30 Maixh 1904, Recueil 24, 320. 

 "-) Journ. fiu- Pralit. Glicm. (:2j 63, 352. 



