Sulphaminic acid

Aniline is very easily sulphonated, for example, by heating its sulphate ( baking process). This change recalls that of aniline acetate into acetanilide. Actually, it is very probable that an analogous product acylated at the amino-group, a sulphaminic acid, is first formed, since examples of this type of change are known, e.g. the conversion of phenylhydroxylamine to p-aminophenol and of phenylnitramine to... 

That this is the course of the reaction is proved by the possibility of isolating the sulphaminic acid corresponding to a-naphthylamine if mild experimental conditions are chosen. At a higher temperature the naphthylsulphaminic acid is converted into l-naphtbylamine-4-sulphonic acid (naphthionic add). 

Specimens of PAA on aluminium were prepared by anodizing in tartaric, phosphoric, oxalic, sulphosalicylic, sulphuric, sulphaminic acid electrolytes as... 

Saccharin.—When ortho-sulpho benzoic acid is treated with phosphorus pentachloride the sulphonic acid group yields the stdphon chloride group and this with ammonia yields the sulphamine group. 

Now or//fo-sulphamine benzoic acid readily loses water and yields an imide anhydride. 

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