_  . Remsen on Parasulphobenzoic Acid. 359 
boxyl: the name would indicate the contrary, but the analogy 
that this compound shows with parasulphaminbenzoic acid, in 
which the amide group is undoubtedly situated in the sulpho- 
group, leads me to believe that the name is incorrect; and that 
the name metasulphaminbenzoic acid would be more in accord- 
ance with the internal character. 
first the flask is heated by means of a very small gas-flame. A 
moderately violent action takes place, and in a short time the 
amide is entirely dissolved ; now in a few minutes the separa- 
tion of the oxidation-product begins. The mass increases con- 
stantly in quantity until the liquid has the form of a thick 
paste. In about an hour from the beginning of the process the 
oxidation is completed. The whole is now allowed to cool 
own to the ordinary temperature, the product is filtered off 
and washed out with cold water, until the wash-water passes 
through colorless. On the filter is the parasulphaminbenzoic 
acid in the form of beautiful crystals, which only require to be 
recrystallized from water once in order to be made perfectly 
pure. It is easily soluble in alcohol and crystallizes from this 
solvent in smaller crystals than are obtained from water; and 
these do not exhibit the property of fluorescence. It is precip- 
itated in crystals both from a hot and cold alcoholic solution by 
water, 
Sulphobenzamic acid erystallizes, according to Limpricht and 
Uslar, in scales like potassium chlorate; according to Engel- 
hardt in rhombohedral crystals or in needles, consisting of ag- 
gregates of small rhombohedrons. Heated above the melting 
point it volatilizes in white vapors. Distilled with phosphorus 
pentachloride it yields a number of products among which is 
ha 
chlorbenzoyl chloride—a point which I shall decide by experi- 
men 
t. 
SO?. NH? : 
Ethyl parasulphaminbenzoate, C°H* a Gas s This 
beautiful compound is the most characteristic derivative ot the 
acid. It is prepared in the usual manner by conducting dried 
sydrochloric acid gas into a solution of the acid in absolute 
cohol, and afterward heating gently on a water bath. Water 
