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Chemistry. — ''Additive compounds of s. trtnitrohenzene.'" Bj Prof. 

 P. VAN RoMBURGH. (Communicated bj Prof. C. A. Lobry de 

 Bruyn). 



(Communicated in the meeting of February 27, 1904.) 



A communication from Jacks(jn and Clarke ^) on additive com- 

 pounds of substituted nitrobenzenes and dimethylaniline and another 

 from HiBBERT and Sudborough ^) on additive compounds of s. trini- 

 trobenzene and alkylated arylamines induces me to call attention to 

 the fact that I have been engaged for a long time with the study 

 of the additive compounds of m. dinitro- and s. trinitrobenzene. In 

 addition to those which I have described in former papers ') I have 

 prepared a large number of compounds with different aromatic amines 

 (such as toluidines, phenylendiamines, benzidine and their alkyl 

 derivatives) which will be fully described elsewhere as soon as the 

 crystallographic investigation of many of these products, kindly 

 undertaken by Dr. F. M. Jaeger, has been concluded. 



Besides with benzene and naphthalene^), s. trinitrobenzene combines, 

 like picric acid, with different aromatic hydrocarbons. It forms with 

 anthracene fine orange-red needles (m. p. 161°), with a ???.é^/i?//an^Amce?ze 

 reddish colored needles (m.p. 138°), with phenanthrene an orange- 

 yellow compound (m.p. leS^)"*) with fluorene a yellow compound. 



In all these compounds we find that 1 mol. of s. trinitrobenzene 

 is combined with one mol. of the hydrocarbon. 



s. Trinitrobenzene forms with «-bromonaphthalene a fine lemon- 

 vellow compound (m.p. 139'') and a similar one with dibenzylidene- 

 acetone. 



Substituted aromatic amino-compounds such as anthranilic acid, 

 and its methy tester, p. aminoacetophenone, ethyl m. and p. amino- 

 benzoate brought together with s trinitrobenzene in alcoholic solution 

 readily form colored well-crystallised compounds, the first two of 

 which are colored orange and the others red. p. Aminobenzoic acid 

 combines less readily and I ha^'e not succeeded in obtaining an 

 additive compound with m. aminobenzoic acid, which is a stronger 

 acid than its isomers. 



Among the above compounds are some which \\\\\, presumably, 

 prove of importance in the hands of the micro-chemist for the 

 detection of certain substances. 



1) Berl. Ber. 37, (1904), S. 177. 

 3) Journ. Chem. Soc. 83 p. 1334. 



3) Rec. d. Trav. chim. d. Pays-Bas 6, 3G6; 7, 3, 228; 8, 274; 14, 65. 



4) Hepp, Ann. d. Chemie 215, S. 876. 



5) In the Dutch pubUcation of this article, the melting point has been stated 

 incorrectly. 



