366 PROCEEDINGS OF THE AMERICAN ACADEMY 



the chloride to one of the amide (1.3 grm. to 1 grm.) is heated ia a 

 flask with a return-cooler to 140° by means of an oil-bath, hydro- 

 chloric acid is given off, and the benzoyl derivative is formed. During 

 the process great care must be taken that the temperature does not 

 rise above 150°, as at a point but little above this (150°-180°) de- 

 composition sets in, and in that case the principal product of the action 

 is kyaphenine. After the action has come to an end, vrhich usually 

 takes from five to seven hours, the product is extracted with benzol to 

 remove any undecomposed benzoylchloride, and purified by crystalli- 

 zation from hot alcohol. Dried at 100° it gave the following results 

 on analysis. 



I. 0.2234 grm. of substance gave 13.3 c.c. of nitrogen under a pres- 

 sure of 766 mm., and at a temperature of 22°. 

 11. 0.1632 grm. of substance gave by the method of Carius 0.1784 

 grm. of baric sulphate. 



Calculated for Found. 



CoHsCSOaNHCTHsOs. I. H. 



Nitrogen 6.69 6.79 



Sulphur 15.31 . . . 15.02 



Properties. — The benzoylbenzoltrisulphamide crystallizes from alco- 

 hol in rather short and stout well-formed prisms, with an unmodified 

 'basal plane, which seem to belong to the hexagonal system. It has no 

 definite melting point, since it decomposes at comparatively low tem- 

 peratures (below 200°), and the melting point is therefore modified 

 by the length of time during which the substance has been heated. 

 The highest point which we have observed is 285°, but this can be 

 materially modified by altering the conditions under which the melting 

 point is taken ; for instance, two tubes were filled with portions of 

 the same preparation, and one of them was allowed to hang in the bath 

 in the usual way, when it melted at 264°, while the other, which was 

 not allowed to remain in the bath, but only dipped into it occasionally, 

 did not melt till 275°. The two observations were made at the same 

 time, so that in all other respects the conditions were the same. The 

 melting is accompanied with blackening and effervescence. By long 

 continued heat at temperatures between 150° and 180'^, the substance 

 is completely decomposed, giving kyaphenine as the principal product, 

 which was recognized by its melting point, 230° (Pinner and Klein* 

 give 231°). The decomposition is undoubtedly similar to that of 



* Ber. d. ch. G., 1878, p. 764. 



