| abstract |
THROUGH, A SECOND REACTOR BEING A PACKED TOWER OF LESSER HEIGHT, THROUGH WHICH THE PARTIALLY REACTED MIXTURE DESCENDS AN EVAPORATOR TO EVAPORATE THE UNREACTED AROMATIC AMINE FROM THE SUBSTITUTED 1,2-DIHYDROQUINOLINE OBTAINED, AND MEANS FOR STRIPPING THE LIGHT FRACTIONS EVOLVED IN THE FIRST REACTOR AND IN THE EVAPORATOR AND REUSING THE SAME AS STARTING MATERIALS. NOVEL SUBSTITUTED 1,2-DIHYDROQUINOLINES HAVE ANTIOXIDANT, BACTERICIDAL AND FUNGICIDAL PROPERTIES. SAID 1,2DIHYDROQUINOLINES ARE PREPARED BY CONDENSING, IN THE PRESENCE OF A CATALYST, PREFERABLY IODINE, A SUBSTITUTED AROMATIC AMINE WITH A CARBONYL COMPOUND, AT A TEMPERATURE OF BETWEEN 90 TO 300*C., SAID CATALYST BEING PREFERABLY PRESENT TOGETHER WITH AN ACTIVATOR SELECTED FROM ALKYL OR ALKARYL HALIDES. SAID PROCESS IS PREDERABLY CARRIED OUT IN AN APPARATUS ESSENTIALLY COMPRISING A MIXING AND FEEDING DEVICE, A FIRST REACTOR BEING A PACKED TOWER OF A HEIGHT SUFFICIENT TO PROVIDE FOR THE NECESSARY RESIDENCE TIME OF THE REACTION MIXTURE IN CONTINUOUS ASCENDING FLOW THERE- |