Ethyl aniline sulfonic acid

Direct sulfonation of amines by sulfuric acid or oleum is not as clear-cut as the baking process. / -(Ethylamino)benzenesulfonic add is formed from A-ethyl aniline,116 but both m- and / -(dimethylamino)benzenesulfonic acid are formed from A,7V-dimethyl aniline.138 According to Blangey and his coworkers,124d 139 m-[(iV-ethyl-7V-phenylamino)methyl]benzenesulfonic acid is obtained from JV-benzyl-JV-ethylaniline. 

Ammonium acetate Aniline Benzanthrone Bromine Carmine (Coccus cacti) Carminic acid 2-Chlorophenol Crystal violet lactone Diaminodiphenic acid Di-n-amylamine Diazoaminobenzene o,a-Dichlorotoluene Dimethoxypropane 4-Dimethylaminoazobenzene-4-sulfonic acid, sodium salt p-Dimethylaminobenzaldehyde 4-Dimethylaminobenzene 6-Dimethylaminophenylazobenzothiazole N,N-Dimethylaniline Dinitrotoluene 2,4-Dinitrotoluene Direct blue 8 Direct blue 10 Direct blue 25 Direct blue 218 Direct orange 6 Direct violet 32 Disperse blue 7 Disperse red 60 Dodecene-1 N-(p-Ethoxycarbonylphenyl)-N -ethyl-N -phenylformamidine Ethylene cyanohydrin Ethylene thiourea... 

Sulfonation. The direct sulfonation of alkylaminotriphenylmethane dyes gives mixtures of substituted products. Although dyes containing anilino or benzylamino groups give more selective substitution, a sulfonated intermediate such as 3[(N-ethyl-N-phenylamino)methyl]benzenesulfonic acid (ethylbenzylanilinesulfonic acid) is the preferred starting material. However, Patent Blue V [354649-0], Cl Acid Blue 3, was made from 3-hydroxybenzaldehyde and two moles of diethyl aniline, followed by sulfonation of the leuco base and oxidation to the dye. FD C Green 2 [5141 -20-8/,... 

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