FIELD: chemistry.
SUBSTANCE: invention relates to a method of obtaining 2,2'-methylenebis[5-amino-4-methylbenzosulphoacid], which includes the sulphonation of 3,3'-dimethyl-4,4'-diaminodiphenylmethane with oleum at heating, the following extraction and purification of the target product by standard methods, which consists in the fact, that 3,3'-dimethyl-4,4'-diaminodiphenylmethane is applied in the form of a sulphate, obtained by the condensation of hydrochloride of o-toluidine with formaldehyde in a 10% solution of sulphuric acid, sulphate of 3,3'-dimethyl-4,4'-diaminodiphenylmethane after drying is subjected to interaction with 65% oleum at the weight ratio of reagents of 1:1.5 respectively.
EFFECT: obtaining the said compound from available initial substances.
2 cl, 3 ex
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