404 



SCIENCE 



[N. S. Vol. XXV. No. 637 



weight of tellurium. Three series of 

 atomic weight determinations of tellurium 

 from Bohemia, Cripple Creek and from 

 western copper ores were made. The 

 double bromide of tellurium and potassium 

 was heated in chlorine gas and the potas- 

 sium chloride weighed. All of the tel- 

 lurium from these various sources showed 

 an atomic weight of 127.5 and no evidence 

 of lack of homogeneity of tellurium has 

 ever appeared to the author. 



An Improved Method for the Qualitative 

 Analysis of the Tim Group, including 

 the Detection of some of the Barer 

 Elements: Arthur A. Noyes and Wm. 

 C. Bray. 



ORGANIC CHEMISTRY 



A. S. Wheeler, Chairman 

 The Nitration of N -Substituted Anilines: 



J. Bishop Tingle and F. C. Blakck. 



A continuation of the work already re- 

 ported {Amer. Chem. Jour., 36, 305). The 

 additional results obtained appear to war- 

 rant the statement of the following pro^ 

 visional rule: In the nitration of N-suh- 

 stituted aniline derivatives, by means of a 

 mixture of nitric and some other acid, the 

 position of the first entering nitro group 

 depends on two influences, viz., the nature 

 of this N -substituting group and the 

 stretigth of the acid, other than nitric, 

 which is present, and these tivo factors may 

 he so selected as to neutralize or reinforce 

 each other. 



The Nitration of Benzene: J. Bishop 



Tingle and F. C. Blanck. 



An investigation of the formation of 

 dinitrobenzene in the presence of sulphuric 

 acid and also of non-acidic or feebly acidic 

 dehydrating agents. The results indicate 

 that the formation of the dinitro derivative 

 is preceded by that of mononitrobenzene. 

 The use of sulphuric acid appears to give 

 a larger yield of crude nitration products 



containing a lower percentage of meta 

 compound and about the same percentage 

 of mixed isomers soluble in alcohol. As 

 nitric acid is a stronger acid than sul- 

 phuric, the result accords with the 'rule' 

 deduced from the nitration experiments 

 with N-substituted anilines and indicates 

 that the rule is of general application. 



Acyl Derivatives of Ortho- and Paramino- 

 phenols: J. Bishop Tingle and L. F. 

 Williams. 



An easy method is described for the 

 preparation of ortho- and paraminophenol 

 by which good yields are obtained. Many 

 new acyl derivatives of these compounds 

 are described. The results of the work 

 may be summarized by saying that, of the 

 thirty derivatives of this type now known, 

 thirteen have been obtained for the first 

 time by the authors, three have been pre- 

 pared by newer and simpler methods, the 

 melting point of one other has been cor- 

 rected and the existence of two of the re- 

 mainder has been shown to be extremely 

 doubtful. 



Condensation of 1, 3-Diketones with Sec- 

 ondary Amines: J. Bishop Tingle and 

 L. F. Williams. 



A number of condensation compounds of 

 camphoroxalic acid and secondary amines 

 have been prepared. Their existence tells 

 strongly in favor of the enolic formula for 

 camphoroxalic acid. The amiaes employed 

 were acetylphenylhydrazine, dibenzylamine, 

 diamylamine and diisoamylamine ; similar 

 products from dimethylamine and diethyl- 

 amine have been previously obtained by 

 the senior author, and, as a class, the sub- 

 stances are believed to be new. Condensa- 

 tion compounds, belonging to various types, 

 of the above acid with the following 

 primary amiaes have also been obtained: 

 ethylamine, orthoaminophenol and para- 

 nitraniline. Camphoroxalic acid and tri- 

 ethylamine yield a salt. 



