THE PRESENT INVENTION RELATES TO THE USE OF COMPOUNDS OF THE GENERAL FORMULA Ι: WHEREIN R¹ IS LOWER ALKYL OR HALOGEN R² IS HYDROGEN OR HALOGENR³ -(CHR)nOH, PHENYL, OPTIONALLY SUBSTITUTED BY -(CHR)nOH, OR IS A SATURATED, PARTIAL SATURATED OR AROMATIC 5-OR 6-MEMBERED HETEROCYCLIC RING WITH ONE HETEROATOM, SELECTED FROM THE GROUP CONSISTING OF-N(R⁴)-,-N=,_N_=, -S- OR -S(O)₂, AND WHICH RINGS ARE OPTIONALLY SUBSTITUTED BY–(CHR)nOH R IS INDEPENDENTLY FROM "n" HYDROGEN OR -(CH₂)nOH R⁴ IS HYDROGEN, -S(O₂)-LOWER ALKYL OR -C(O)-LOWER ALKYL X IS –O-, -CH₂O-, -S- OR A BOND n IS 1 OR 2 OR TO PHARMACEUTICALLY ACTIVE ACID-ADDITION SALTS THEREOF, FOR THE PREPARATION OF MEDICAMENTS FOR THE TREATMENT OF SCHIZOPHRENIA.
