OF ARTS AND SCIENCES. 361 



C,H3(S03C,I-L)3 = C,Il3(S03H), + 3 C,H„ 

 as 0.1674 grm. of substance lost 0.0324 grm. 



Calculated for a loss of 3 C^H^. Found . 



20.89 19.36. 



It is essentially insoluble in water, freely soluble in ether, chloro- 

 form, carbonic disulphide, or benzol, — the last being the best solvent 

 for it, — insoluble in ligroine, decomposed and dissolved by glacial 

 acetic acid, dissolves freely in alcohol, but is decomposed by it, as 

 upon evaporating the solution, even if absolute alcohol is used, the 

 benzoltrisulphouic acid is left. This reaction seemed to us so curious 

 that we studied it more carefully, as follows. 10 grm. of benzol- 

 trisulphochloride were boiled in a flask with a reverse cooler with 12 

 grm. of absolute alcohol; after half an hour the solid had completely 

 dissolved, and upon examining the flask it was found that much 

 hydrochloric acid had been formed, also apparently a little ethyl- 

 chloride due to a secondary reaction, but no ethylene could be 

 detected. The contents of the flask, after being freed from hydro- 

 chloric acid with potassic hydrate, were distilled fractionally with a 

 Hemjjel's column, when it appeared that the principal product of the 

 reaction was ethylether, recognized by its boiling-point, 35°, and by 

 its smell. The following reactions, therefore, probably take place : — 



I. C,lU^O,C\\ + 3 C,H,OH = C,H3(SO,aH,)3 + 3 HCl ; 

 II. C,H,(S03C,H,)3 + 3 C,H,OH ==. C«H3(S03H)3 + 3 (C,H,),0 ; 



and the action is exactly analogous to the ordinary method of making 

 ethylether. Methylalcohol seems to act on the ester in the same 

 way as etliylalcohol, — the residue left after evaporating a methyl- 

 alcohol solution of it being benzoltrisulphonic acid. The ester was 

 not acted on in the cold by sodium or sodic etliylate. 



Benzoltrisulphamide, CyH3(SOoNH2)3. 



This substance was made by adding a very strong solution of 

 ammonia to the benzoltrisulphochloride and allowing the mixture to 

 stand a short time. It was purified by crystallization from boiling 

 water. It can be formed also by the action of amnionic carbonate on 

 the chloride, but the result was less satisfactory than Avith the solution 

 of ammonia. The mother liquors from the crystallization contain a 

 quantity of ammonic benzoltrisulphonate, which, after conversion into 



