The 2,2-bis(3-aminophenyl)hexafluoropropane derivatives have the formula …IMAGE… in which R1 is hydrogen or an acyl radical in which a non-aromatic hydrocarbon radical having 1 to 6 carbon atoms is bound to the CO group and R2 is H or NO2 if R1 is an acyl radical and is NO2 if R1 is hydrogen. 2,2-Bis(3,4-diaminophenyl)hexafluoropropane of the formula …IMAGE… is prepared by… a) acylating 2,2-bis(3-aminophenyl)hexafluoropropane under conventional acylation conditions to give 2,2-bis(3-acylamidophenyl)hexafluoropropane,… b) the 2,2-bis(3-acylamidophenyl)hexafluoropropane is nitrated under conventional nitration conditions to give 2,2-bis(3-acylamido-4-nitrophenyl)hexafluoropropane,… c) the 2,2-bis(3-acylamido-4-nitrophenyl)hexafluoropropane thus obtained is deacylated under conditions customary for deacylation to give 2,2-bis(3-amino-4-nitrophenyl)hexafluoropropane,… d) this product is reduced under conditions customary for the reduction of nitro compounds to give 2,2-bis(3,4-diaminophenyl)hexafluoropropane and this compound is isolated or subjected to purification such that it is converted into the solution of one of its salts, the impurities are adsorbed on an adsorbent and the 2,2-bis(3,4-diaminophenyl)hexafluoropropane is precipitated using a base.
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