Аннотация:The regioselectivity of the fast stages of the anilinepolymerization mechanism is considered. Using the AM1method, the approaching of the radical cation of an aniline trimerto the aniline radical cation with chloride counterions, as well asthe radical cations of the monomer to each other is simulated. It isshown that on passing from the recombination of the anilineradical cations with each other to the recombination of the anilineradical cations with the radical cations of an aniline trimer, themain approaching direction changes from C/N to N/N, which isfollowed by the semidine rearrangement. The high para-selectivity of the aniline polymerization is explained and the ratioof the rate constants of various recombination routes of theradical cations is evaluated.