HILL AND CORNELISOX. — CROTONOLACTONES. 49 



I. 0.2916 grm. substance gave with HBr 0.1440 grm. AgBr. 

 II. 0.2384 grm. substance gave with HN0 3 and AgN0 3 0.2347 grm. 

 AgBr. 

 III. 0.3502 grm. substance gave 22.2 c.c. of moist nitrogen at 19° and 

 under a pressure of 754 mm. 



Found. 



III. 



7.37 



A salt which closely resembles that which we have just described is 

 precipitated when an alcoholic sokition of argentic nitrate is added to 

 an alcoholic solution of dibrommaleinimide. It can contain no am- 

 monia, however, and is the silver salt of the imide. 



0.3153 grm. substance gave 10.7 c.c. of moist nitrogen at 17° and 

 under a pressure of 777 mm. 



Calculated for 4 Br 2 NO,Ag Found. 



N 3.87 4.02 



The strongly acid filtrate from this salt gave with alcoholic ammo- 

 nia an ammonio-silver salt identical with that prepared from the 

 methyl ester of mucobromoxime. 



0.3553 grm. substance gave 21.9 c.c. of moist nitrogen at 17° and 

 under a pressure of 775 mm. 



Calculated for C 4 Br,N0 2 AgNH 3 Found. 



N 7.39 7.30 



In the preparation of the mucobromoxime methyl ester directly from 

 mucobromic acid, there is also formed an oil, which, although some- 

 what soluble in water, is precipitated by the addition of water to the 

 methyl-alcoholic mother liquors. We have not obtained it in a condi- 

 tion fit for analysis, but as it is readily decomposed by water with the 

 formation of dibrommaleic acid it is doubtless an acid ester of this 

 acid. 



3fucobromamide, C 4 TIBro0 2 NH 2 — When ammonia gas is passed 

 into a solution of ethyl mucobromate in dry ether, reaction immediately 

 takes place, and mueobromamide separates. This body may also be pre- 

 pared by the action of alcoholic ammonia upon an alcoholic solution of 

 the ester at ordinary temperatures, but the product so obtained is dark 

 vol. xxix. (n. s. xxi ) 4 



