Dihydropyridazones, their manufacture, and therapeutic agents containing dihydropyridazones

Abstract From the Canadian patent

O.Z. 32,647, ABSTRACT OF THE DISCLOSURE: 6-(p-Acylaminophenyl)-4,5-dihydropyridaz-3-ones of the formula I I, where R1 is hydrogen or alkyl of 1 to 3 carbon atoms and R2 if, R1 is hydrogen, is halogen-substituted alkyl of 3 to 6 carbon atoms or .beta.-haloethyl or, if R1 is alkyl of 1 to 3 carbon atoms is halogen-substituted alkyl of 1 to 6 carbon atoms their manu-, facture, and therapeutlc agents which contain as the active, ingredient, a compound of the formula I where R2 may also be halo-, methyl or .alpha.-haloethyl if R1 is hydrogen. These compounds may be used as anti-hypertensive agents and for the prophylaxis and therapy of thrombo-embolic disorders.