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Chemistry. — "On the sU Isomeric ttibroinouji/lenes." By Dr. F. M. 

 Jaeger and J. J. Blanksma. (Communicated by Prof. A. ¥. 

 Holleman). 



The six isomeric tribromotoluenes were prepared in J 880 by 

 Nevile and Winther ^) and again in 1903 in a different manner by 

 Jaeger^) with tlie object of studying tlie connection between mole- 

 cular and crystallographic symmetry with isomeric benzene derivatives. 

 In order to be able to extend this study to another series of com- 

 pounds with an analogous chemical character we have now prepared 

 the isomeric tribromoxylenes and give a short review of the mode 

 of formation of these substances; we intend publishing a more extended 

 report later on in the "Recueil". 



Tribromo-6>-xylenes. 



These substances are prepared by starting from the orthoxylidines 

 1-2-3 and 1-2-4 according to the subjoined scheme : 



The orthoxylidines were treated in glacial acetic acid with the 

 calculated amount of bromine and in the dibromoxylidines thus 

 obtained the NH^-group was replaced by Br according to Sandmeyer's 

 method. The tribromoxylenes thus obtained were purified by distilla- 

 tion in steam. 



Tribromo-7/^xylenes. 



È. 2-4-6-tribronio-//i-xylene was prepared in different ways. 



a. Starting from symmetrical xylidine, 



The sym. xylidine was converted into tribromo-sym. -xylidine and 



1) Ber. 13. 974. 



2j Dissertation, Leiden, 1903. 



