Abstract - A distribution of the products in the reaction of aryl isothiocyanates with isocyanides and 2,2-dialkylenamines has been studied in details. In range 55-60 C this reaction results in the formation of dihydrothiophene-2,5-diimine derivatives, constitutions of which are proved by an X-ray analysis. In contrast at high temperature (above 110 C) the major products in the present reaction are 2-imino-5-thiopyrrolidones. A one step pathway to dihydrothiophene structure has been elaborated.