Abstract: Process for the preparation of compounds of the formula I ##STR1## in which R.sup.1 denotes NO.sub.2 or NH.sub.2 andR.sup.2 denotes a radical of a cycloaliphatic amine having 6 ring atoms and a total of not more than 10 carbon atoms, a benzylamine radical, an aniline radical which contains up to three substituents belonging to the group comprising alkyl, alkoxy, chlorine and bromine, not more than two of which can be halogen and not more than one of which can be alkoxy, and contains a total of not more than 10 carbon atoms, or which contains a trifluoromethyl or phenoxy group, or R.sup.2 denotes the phenylmercapto radical or the benzylmercapto radical, compounds of the formula I in which R.sup.1 is NO.sub.2 or NH.sub.2 and R.sup.

Abstract: Isomer mixtures of 1,3- and 1,4-bis-(2-hydroxyhexafluoroprop-2-yl)-benzene are separated by a steam distillation in the presence of CS.sub.2. On cooling of the steam distillate, a solid precipitates which is composed mainly of the 1,4-isomer. After the solid has been separated off, an aqueous-organic liquid-phase mixture remains, the organic phase of which mainly contains the 1,3-isomer. The pure isomers are obtained by recrystallization or distillation respectively. These are mainly intermediates in the polymer field.

Abstract: 2,2-Bis-(3-nitrophenyl)-hexafluoropropane is prepared by oxidation of 2,2-bis-(4-methylphenyl)-hexafluoropropane to 2,2-bis-(4-carboxyphenyl)-hexafluoropropane, nitration of this compound to 2,2-bis-(4-carboxy-3-nitrophenyl)-hexafluoropropane and decarboxylation of the last-mentioned compound.The process lends to 2,2-bis-(3-nitrophenyl)-hexafluoropropane, free of isomers, in an industrially simple manner and with the use of common chemicals. The compound is a valuable intermediate in the polymer field.The 2,2-bis-(4-carboxy-3-nitrophenyl)-hexafluoropropane occurring as an intermediate in the process is novel.