NEW TRENDS IN THE CHEMISTRY OF AROMATIC-COMPOUNDS WITH FLUORINE-CONTAINING SUBSTITUENTS

Recently, new methods for the introduction of fluorine-containing subs tituents into aromatic compounds have been developed in our Department and new types of organic substances synthesized. Emphasis has been pl aced not only on the 'classic' groups, such as the fluorine atom or pe rfluoro-aIkyl and -alkenyl fragments, but mainly on substituents with perfluoroalkyl groups separated from the nuclei by the heteroatoms oxy gen, sulfur (in valency states 2, 4 and 6), nitrogen and metals. We ha ve also developed new principles for the construction of super-strong electron-withdrawing substituents and superstrong acids. This approach consists in replacing the sp(2)-oxygen atom in various groups with th e =NSO2CF3 radical and has been confirmed by examples of substituents with the central atoms consisting of sulfur in different valence state s, carbon, phosphorus and iodine. From this principle, a stable substi tuent with sigma(p) constant 1.76, equal to three nitro groups in its influence toward benzene nuclei, has been constructed.